mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE

Most of the VM_BUG_ON assertions are performed on a page.  Usually, when
one of these assertions fails we'll get a BUG_ON with a call stack and
the registers.

I've recently noticed based on the requests to add a small piece of code
that dumps the page to various VM_BUG_ON sites that the page dump is
quite useful to people debugging issues in mm.

This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what
VM_BUG_ON() does, also dumps the page before executing the actual
BUG_ON.

[akpm@linux-foundation.org: fix up includes]
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 0596e8e..207d9ae 100644 (file)
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -108,8 +108,8 @@ static noinline int gup_pte_range(pmd_t pmd, unsigned long addr,
 
 static inline void get_head_page_multiple(struct page *page, int nr)
 {
-       VM_BUG_ON(page != compound_head(page));
-       VM_BUG_ON(page_count(page) == 0);
+       VM_BUG_ON_PAGE(page != compound_head(page), page);
+       VM_BUG_ON_PAGE(page_count(page) == 0, page);
        atomic_add(nr, &page->_count);
        SetPageReferenced(page);
 }
@@ -135,7 +135,7 @@ static noinline int gup_huge_pmd(pmd_t pmd, unsigned long addr,
        head = pte_page(pte);
        page = head + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
        do {
-               VM_BUG_ON(compound_head(page) != head);
+               VM_BUG_ON_PAGE(compound_head(page) != head, page);
                pages[*nr] = page;
                if (PageTail(page))
                        get_huge_page_tail(page);
@@ -212,7 +212,7 @@ static noinline int gup_huge_pud(pud_t pud, unsigned long addr,
        head = pte_page(pte);
        page = head + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
        do {
-               VM_BUG_ON(compound_head(page) != head);
+               VM_BUG_ON_PAGE(compound_head(page) != head, page);
                pages[*nr] = page;
                if (PageTail(page))
                        get_huge_page_tail(page);

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 9b4dd49..0437439 100644 (file)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -1,6 +1,7 @@
 #ifndef __LINUX_GFP_H
 #define __LINUX_GFP_H
 
+#include <linux/mmdebug.h>
 #include <linux/mmzone.h>
 #include <linux/stddef.h>
 #include <linux/linkage.h>

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index d01cc97..8c43cc4 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -2,6 +2,7 @@
 #define _LINUX_HUGETLB_H
 
 #include <linux/mm_types.h>
+#include <linux/mmdebug.h>
 #include <linux/fs.h>
 #include <linux/hugetlb_inline.h>
 #include <linux/cgroup.h>
@@ -354,7 +355,7 @@ static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 
 static inline struct hstate *page_hstate(struct page *page)
 {
-       VM_BUG_ON(!PageHuge(page));
+       VM_BUG_ON_PAGE(!PageHuge(page), page);
        return size_to_hstate(PAGE_SIZE << compound_order(page));
 }
 

diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
index ce8217f..787bba3 100644 (file)
--- a/include/linux/hugetlb_cgroup.h
+++ b/include/linux/hugetlb_cgroup.h
@@ -15,6 +15,7 @@
 #ifndef _LINUX_HUGETLB_CGROUP_H
 #define _LINUX_HUGETLB_CGROUP_H
 
+#include <linux/mmdebug.h>
 #include <linux/res_counter.h>
 
 struct hugetlb_cgroup;
@@ -28,7 +29,7 @@ struct hugetlb_cgroup;
 
 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 {
-       VM_BUG_ON(!PageHuge(page));
+       VM_BUG_ON_PAGE(!PageHuge(page), page);
 
        if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
                return NULL;
@@ -38,7 +39,7 @@ static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
 static inline
 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
 {
-       VM_BUG_ON(!PageHuge(page));
+       VM_BUG_ON_PAGE(!PageHuge(page), page);
 
        if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
                return -1;

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 03bbcb8..d9992fc 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -5,6 +5,7 @@
 
 #ifdef __KERNEL__
 
+#include <linux/mmdebug.h>
 #include <linux/gfp.h>
 #include <linux/bug.h>
 #include <linux/list.h>
@@ -303,7 +304,7 @@ static inline int get_freepage_migratetype(struct page *page)
  */
 static inline int put_page_testzero(struct page *page)
 {
-       VM_BUG_ON(atomic_read(&page->_count) == 0);
+       VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
        return atomic_dec_and_test(&page->_count);
 }
 
@@ -364,7 +365,7 @@ static inline int is_vmalloc_or_module_addr(const void *x)
 static inline void compound_lock(struct page *page)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-       VM_BUG_ON(PageSlab(page));
+       VM_BUG_ON_PAGE(PageSlab(page), page);
        bit_spin_lock(PG_compound_lock, &page->flags);
 #endif
 }
@@ -372,7 +373,7 @@ static inline void compound_lock(struct page *page)
 static inline void compound_unlock(struct page *page)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-       VM_BUG_ON(PageSlab(page));
+       VM_BUG_ON_PAGE(PageSlab(page), page);
        bit_spin_unlock(PG_compound_lock, &page->flags);
 #endif
 }
@@ -447,7 +448,7 @@ static inline bool __compound_tail_refcounted(struct page *page)
  */
 static inline bool compound_tail_refcounted(struct page *page)
 {
-       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
        return __compound_tail_refcounted(page);
 }
 
@@ -456,9 +457,9 @@ static inline void get_huge_page_tail(struct page *page)
        /*
         * __split_huge_page_refcount() cannot run from under us.
         */
-       VM_BUG_ON(!PageTail(page));
-       VM_BUG_ON(page_mapcount(page) < 0);
-       VM_BUG_ON(atomic_read(&page->_count) != 0);
+       VM_BUG_ON_PAGE(!PageTail(page), page);
+       VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
+       VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
        if (compound_tail_refcounted(page->first_page))
                atomic_inc(&page->_mapcount);
 }
@@ -474,7 +475,7 @@ static inline void get_page(struct page *page)
         * Getting a normal page or the head of a compound page
         * requires to already have an elevated page->_count.
         */
-       VM_BUG_ON(atomic_read(&page->_count) <= 0);
+       VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
        atomic_inc(&page->_count);
 }
 
@@ -511,13 +512,13 @@ static inline int PageBuddy(struct page *page)
 
 static inline void __SetPageBuddy(struct page *page)
 {
-       VM_BUG_ON(atomic_read(&page->_mapcount) != -1);
+       VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page);
        atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE);
 }
 
 static inline void __ClearPageBuddy(struct page *page)
 {
-       VM_BUG_ON(!PageBuddy(page));
+       VM_BUG_ON_PAGE(!PageBuddy(page), page);
        atomic_set(&page->_mapcount, -1);
 }
 
@@ -1401,7 +1402,7 @@ static inline bool ptlock_init(struct page *page)
         * slab code uses page->slab_cache and page->first_page (for tail
         * pages), which share storage with page->ptl.
         */
-       VM_BUG_ON(*(unsigned long *)&page->ptl);
+       VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
        if (!ptlock_alloc(page))
                return false;
        spin_lock_init(ptlock_ptr(page));
@@ -1492,7 +1493,7 @@ static inline bool pgtable_pmd_page_ctor(struct page *page)
 static inline void pgtable_pmd_page_dtor(struct page *page)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-       VM_BUG_ON(page->pmd_huge_pte);
+       VM_BUG_ON_PAGE(page->pmd_huge_pte, page);
 #endif
        ptlock_free(page);
 }
@@ -2029,10 +2030,6 @@ extern void shake_page(struct page *p, int access);
 extern atomic_long_t num_poisoned_pages;
 extern int soft_offline_page(struct page *page, int flags);
 
-extern void dump_page(struct page *page, char *reason);
-extern void dump_page_badflags(struct page *page, char *reason,
-                              unsigned long badflags);
-
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 extern void clear_huge_page(struct page *page,
                            unsigned long addr,

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 580bd58..5042c03 100644 (file)
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -1,10 +1,19 @@
 #ifndef LINUX_MM_DEBUG_H
 #define LINUX_MM_DEBUG_H 1
 
+struct page;
+
+extern void dump_page(struct page *page, char *reason);
+extern void dump_page_badflags(struct page *page, char *reason,
+                              unsigned long badflags);
+
 #ifdef CONFIG_DEBUG_VM
 #define VM_BUG_ON(cond) BUG_ON(cond)
+#define VM_BUG_ON_PAGE(cond, page) \
+       do { if (unlikely(cond)) { dump_page(page, NULL); BUG(); } } while (0)
 #else
 #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
+#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
 #endif
 
 #ifdef CONFIG_DEBUG_VIRTUAL

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 98ada58..e464b4e 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -412,7 +412,7 @@ static inline void ClearPageCompound(struct page *page)
  */
 static inline int PageTransHuge(struct page *page)
 {
-       VM_BUG_ON(PageTail(page));
+       VM_BUG_ON_PAGE(PageTail(page), page);
        return PageHead(page);
 }
 
@@ -460,25 +460,25 @@ static inline int PageTransTail(struct page *page)
  */
 static inline int PageSlabPfmemalloc(struct page *page)
 {
-       VM_BUG_ON(!PageSlab(page));
+       VM_BUG_ON_PAGE(!PageSlab(page), page);
        return PageActive(page);
 }
 
 static inline void SetPageSlabPfmemalloc(struct page *page)
 {
-       VM_BUG_ON(!PageSlab(page));
+       VM_BUG_ON_PAGE(!PageSlab(page), page);
        SetPageActive(page);
 }
 
 static inline void __ClearPageSlabPfmemalloc(struct page *page)
 {
-       VM_BUG_ON(!PageSlab(page));
+       VM_BUG_ON_PAGE(!PageSlab(page), page);
        __ClearPageActive(page);
 }
 
 static inline void ClearPageSlabPfmemalloc(struct page *page)
 {
-       VM_BUG_ON(!PageSlab(page));
+       VM_BUG_ON_PAGE(!PageSlab(page), page);
        ClearPageActive(page);
 }
 

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index e3dea75..1710d1b 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -162,7 +162,7 @@ static inline int page_cache_get_speculative(struct page *page)
         * disabling preempt, and hence no need for the "speculative get" that
         * SMP requires.
         */
-       VM_BUG_ON(page_count(page) == 0);
+       VM_BUG_ON_PAGE(page_count(page) == 0, page);
        atomic_inc(&page->_count);
 
 #else
@@ -175,7 +175,7 @@ static inline int page_cache_get_speculative(struct page *page)
                return 0;
        }
 #endif
-       VM_BUG_ON(PageTail(page));
+       VM_BUG_ON_PAGE(PageTail(page), page);
 
        return 1;
 }
@@ -191,14 +191,14 @@ static inline int page_cache_add_speculative(struct page *page, int count)
 # ifdef CONFIG_PREEMPT_COUNT
        VM_BUG_ON(!in_atomic());
 # endif
-       VM_BUG_ON(page_count(page) == 0);
+       VM_BUG_ON_PAGE(page_count(page) == 0, page);
        atomic_add(count, &page->_count);
 
 #else
        if (unlikely(!atomic_add_unless(&page->_count, count, 0)))
                return 0;
 #endif
-       VM_BUG_ON(PageCompound(page) && page != compound_head(page));
+       VM_BUG_ON_PAGE(PageCompound(page) && page != compound_head(page), page);
 
        return 1;
 }
@@ -210,7 +210,7 @@ static inline int page_freeze_refs(struct page *page, int count)
 
 static inline void page_unfreeze_refs(struct page *page, int count)
 {
-       VM_BUG_ON(page_count(page) != 0);
+       VM_BUG_ON_PAGE(page_count(page) != 0, page);
        VM_BUG_ON(count == 0);
 
        atomic_set(&page->_count, count);

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 9e4761c..e3817d2 100644 (file)
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -1,6 +1,7 @@
 #ifndef __LINUX_PERCPU_H
 #define __LINUX_PERCPU_H
 
+#include <linux/mmdebug.h>
 #include <linux/preempt.h>
 #include <linux/smp.h>
 #include <linux/cpumask.h>

diff --git a/mm/cleancache.c b/mm/cleancache.c
index 5875f48..d0eac43 100644 (file)
--- a/mm/cleancache.c
+++ b/mm/cleancache.c
@@ -237,7 +237,7 @@ int __cleancache_get_page(struct page *page)
                goto out;
        }
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        fake_pool_id = page->mapping->host->i_sb->cleancache_poolid;
        if (fake_pool_id < 0)
                goto out;
@@ -279,7 +279,7 @@ void __cleancache_put_page(struct page *page)
                return;
        }
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        fake_pool_id = page->mapping->host->i_sb->cleancache_poolid;
        if (fake_pool_id < 0)
                return;
@@ -318,7 +318,7 @@ void __cleancache_invalidate_page(struct address_space *mapping,
                if (pool_id < 0)
                        return;
 
-               VM_BUG_ON(!PageLocked(page));
+               VM_BUG_ON_PAGE(!PageLocked(page), page);
                if (cleancache_get_key(mapping->host, &key) >= 0) {
                        cleancache_ops->invalidate_page(pool_id,
                                        key, page->index);

diff --git a/mm/compaction.c b/mm/compaction.c
index 3a91a2e..e0ab02d 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -601,7 +601,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                if (__isolate_lru_page(page, mode) != 0)
                        continue;
 
-               VM_BUG_ON(PageTransCompound(page));
+               VM_BUG_ON_PAGE(PageTransCompound(page), page);
 
                /* Successfully isolated */
                cc->finished_update_migrate = true;

diff --git a/mm/filemap.c b/mm/filemap.c
index b7749a9..7a7f3e0 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -409,9 +409,9 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 {
        int error;
 
-       VM_BUG_ON(!PageLocked(old));
-       VM_BUG_ON(!PageLocked(new));
-       VM_BUG_ON(new->mapping);
+       VM_BUG_ON_PAGE(!PageLocked(old), old);
+       VM_BUG_ON_PAGE(!PageLocked(new), new);
+       VM_BUG_ON_PAGE(new->mapping, new);
 
        error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM);
        if (!error) {
@@ -461,8 +461,8 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
 {
        int error;
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(PageSwapBacked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(PageSwapBacked(page), page);
 
        error = mem_cgroup_cache_charge(page, current->mm,
                                        gfp_mask & GFP_RECLAIM_MASK);
@@ -607,7 +607,7 @@ EXPORT_SYMBOL_GPL(add_page_wait_queue);
  */
 void unlock_page(struct page *page)
 {
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        clear_bit_unlock(PG_locked, &page->flags);
        smp_mb__after_clear_bit();
        wake_up_page(page, PG_locked);
@@ -760,7 +760,7 @@ repeat:
                        page_cache_release(page);
                        goto repeat;
                }
-               VM_BUG_ON(page->index != offset);
+               VM_BUG_ON_PAGE(page->index != offset, page);
        }
        return page;
 }
@@ -1656,7 +1656,7 @@ retry_find:
                put_page(page);
                goto retry_find;
        }
-       VM_BUG_ON(page->index != offset);
+       VM_BUG_ON_PAGE(page->index != offset, page);
 
        /*
         * We have a locked page in the page cache, now we need to check

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 95d1acb..25fab71 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -712,7 +712,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
        pgtable_t pgtable;
        spinlock_t *ptl;
 
-       VM_BUG_ON(!PageCompound(page));
+       VM_BUG_ON_PAGE(!PageCompound(page), page);
        pgtable = pte_alloc_one(mm, haddr);
        if (unlikely(!pgtable))
                return VM_FAULT_OOM;
@@ -893,7 +893,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                goto out;
        }
        src_page = pmd_page(pmd);
-       VM_BUG_ON(!PageHead(src_page));
+       VM_BUG_ON_PAGE(!PageHead(src_page), src_page);
        get_page(src_page);
        page_dup_rmap(src_page);
        add_mm_counter(dst_mm, MM_ANONPAGES, HPAGE_PMD_NR);
@@ -1067,7 +1067,7 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
        ptl = pmd_lock(mm, pmd);
        if (unlikely(!pmd_same(*pmd, orig_pmd)))
                goto out_free_pages;
-       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
 
        pmdp_clear_flush(vma, haddr, pmd);
        /* leave pmd empty until pte is filled */
@@ -1133,7 +1133,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                goto out_unlock;
 
        page = pmd_page(orig_pmd);
-       VM_BUG_ON(!PageCompound(page) || !PageHead(page));
+       VM_BUG_ON_PAGE(!PageCompound(page) || !PageHead(page), page);
        if (page_mapcount(page) == 1) {
                pmd_t entry;
                entry = pmd_mkyoung(orig_pmd);
@@ -1211,7 +1211,7 @@ alloc:
                        add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR);
                        put_huge_zero_page();
                } else {
-                       VM_BUG_ON(!PageHead(page));
+                       VM_BUG_ON_PAGE(!PageHead(page), page);
                        page_remove_rmap(page);
                        put_page(page);
                }
@@ -1249,7 +1249,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
                goto out;
 
        page = pmd_page(*pmd);
-       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
        if (flags & FOLL_TOUCH) {
                pmd_t _pmd;
                /*
@@ -1274,7 +1274,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
                }
        }
        page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT;
-       VM_BUG_ON(!PageCompound(page));
+       VM_BUG_ON_PAGE(!PageCompound(page), page);
        if (flags & FOLL_GET)
                get_page_foll(page);
 
@@ -1432,9 +1432,9 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
                } else {
                        page = pmd_page(orig_pmd);
                        page_remove_rmap(page);
-                       VM_BUG_ON(page_mapcount(page) < 0);
+                       VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
                        add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
-                       VM_BUG_ON(!PageHead(page));
+                       VM_BUG_ON_PAGE(!PageHead(page), page);
                        atomic_long_dec(&tlb->mm->nr_ptes);
                        spin_unlock(ptl);
                        tlb_remove_page(tlb, page);
@@ -2176,9 +2176,9 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
                if (unlikely(!page))
                        goto out;
 
-               VM_BUG_ON(PageCompound(page));
-               BUG_ON(!PageAnon(page));
-               VM_BUG_ON(!PageSwapBacked(page));
+               VM_BUG_ON_PAGE(PageCompound(page), page);
+               VM_BUG_ON_PAGE(!PageAnon(page), page);
+               VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
 
                /* cannot use mapcount: can't collapse if there's a gup pin */
                if (page_count(page) != 1)
@@ -2201,8 +2201,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
                }
                /* 0 stands for page_is_file_cache(page) == false */
                inc_zone_page_state(page, NR_ISOLATED_ANON + 0);
-               VM_BUG_ON(!PageLocked(page));
-               VM_BUG_ON(PageLRU(page));
+               VM_BUG_ON_PAGE(!PageLocked(page), page);
+               VM_BUG_ON_PAGE(PageLRU(page), page);
 
                /* If there is no mapped pte young don't collapse the page */
                if (pte_young(pteval) || PageReferenced(page) ||
@@ -2232,7 +2232,7 @@ static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
                } else {
                        src_page = pte_page(pteval);
                        copy_user_highpage(page, src_page, address, vma);
-                       VM_BUG_ON(page_mapcount(src_page) != 1);
+                       VM_BUG_ON_PAGE(page_mapcount(src_page) != 1, src_page);
                        release_pte_page(src_page);
                        /*
                         * ptl mostly unnecessary, but preempt has to
@@ -2311,7 +2311,7 @@ static struct page
                       struct vm_area_struct *vma, unsigned long address,
                       int node)
 {
-       VM_BUG_ON(*hpage);
+       VM_BUG_ON_PAGE(*hpage, *hpage);
        /*
         * Allocate the page while the vma is still valid and under
         * the mmap_sem read mode so there is no memory allocation
@@ -2580,7 +2580,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
                 */
                node = page_to_nid(page);
                khugepaged_node_load[node]++;
-               VM_BUG_ON(PageCompound(page));
+               VM_BUG_ON_PAGE(PageCompound(page), page);
                if (!PageLRU(page) || PageLocked(page) || !PageAnon(page))
                        goto out_unmap;
                /* cannot use mapcount: can't collapse if there's a gup pin */
@@ -2876,7 +2876,7 @@ again:
                return;
        }
        page = pmd_page(*pmd);
-       VM_BUG_ON(!page_count(page));
+       VM_BUG_ON_PAGE(!page_count(page), page);
        get_page(page);
        spin_unlock(ptl);
        mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 04306b9..c01cb9f 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -584,7 +584,7 @@ static void update_and_free_page(struct hstate *h, struct page *page)
                                1 << PG_active | 1 << PG_reserved |
                                1 << PG_private | 1 << PG_writeback);
        }
-       VM_BUG_ON(hugetlb_cgroup_from_page(page));
+       VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
        set_compound_page_dtor(page, NULL);
        set_page_refcounted(page);
        arch_release_hugepage(page);
@@ -1089,7 +1089,7 @@ retry:
                 * no users -- drop the buddy allocator's reference.
                 */
                put_page_testzero(page);
-               VM_BUG_ON(page_count(page));
+               VM_BUG_ON_PAGE(page_count(page), page);
                enqueue_huge_page(h, page);
        }
 free:
@@ -3503,7 +3503,7 @@ int dequeue_hwpoisoned_huge_page(struct page *hpage)
 
 bool isolate_huge_page(struct page *page, struct list_head *list)
 {
-       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
        if (!get_page_unless_zero(page))
                return false;
        spin_lock(&hugetlb_lock);
@@ -3514,7 +3514,7 @@ bool isolate_huge_page(struct page *page, struct list_head *list)
 
 void putback_active_hugepage(struct page *page)
 {
-       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
        spin_lock(&hugetlb_lock);
        list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist);
        spin_unlock(&hugetlb_lock);
@@ -3523,7 +3523,7 @@ void putback_active_hugepage(struct page *page)
 
 bool is_hugepage_active(struct page *page)
 {
-       VM_BUG_ON(!PageHuge(page));
+       VM_BUG_ON_PAGE(!PageHuge(page), page);
        /*
         * This function can be called for a tail page because the caller,
         * scan_movable_pages, scans through a given pfn-range which typically

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index d747a84..cb00829 100644 (file)
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -390,7 +390,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
        if (hugetlb_cgroup_disabled())
                return;
 
-       VM_BUG_ON(!PageHuge(oldhpage));
+       VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
        spin_lock(&hugetlb_lock);
        h_cg = hugetlb_cgroup_from_page(oldhpage);
        set_hugetlb_cgroup(oldhpage, NULL);

diff --git a/mm/internal.h b/mm/internal.h
index a346ba1..dc95e97 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -27,8 +27,8 @@ static inline void set_page_count(struct page *page, int v)
  */
 static inline void set_page_refcounted(struct page *page)
 {
-       VM_BUG_ON(PageTail(page));
-       VM_BUG_ON(atomic_read(&page->_count));
+       VM_BUG_ON_PAGE(PageTail(page), page);
+       VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
        set_page_count(page, 1);
 }
 
@@ -46,7 +46,7 @@ static inline void __get_page_tail_foll(struct page *page,
         * speculative page access (like in
         * page_cache_get_speculative()) on tail pages.
         */
-       VM_BUG_ON(atomic_read(&page->first_page->_count) <= 0);
+       VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page);
        if (get_page_head)
                atomic_inc(&page->first_page->_count);
        get_huge_page_tail(page);
@@ -71,7 +71,7 @@ static inline void get_page_foll(struct page *page)
                 * Getting a normal page or the head of a compound page
                 * requires to already have an elevated page->_count.
                 */
-               VM_BUG_ON(atomic_read(&page->_count) <= 0);
+               VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
                atomic_inc(&page->_count);
        }
 }
@@ -173,7 +173,7 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
 static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
                                    struct page *page)
 {
-       VM_BUG_ON(PageLRU(page));
+       VM_BUG_ON_PAGE(PageLRU(page), page);
 
        if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
                return 0;

diff --git a/mm/ksm.c b/mm/ksm.c
index 3df141e..f91ddf5 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1898,13 +1898,13 @@ int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc)
        int ret = SWAP_AGAIN;
        int search_new_forks = 0;
 
-       VM_BUG_ON(!PageKsm(page));
+       VM_BUG_ON_PAGE(!PageKsm(page), page);
 
        /*
         * Rely on the page lock to protect against concurrent modifications
         * to that page's node of the stable tree.
         */
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
 
        stable_node = page_stable_node(page);
        if (!stable_node)
@@ -1958,13 +1958,13 @@ void ksm_migrate_page(struct page *newpage, struct page *oldpage)
 {
        struct stable_node *stable_node;
 
-       VM_BUG_ON(!PageLocked(oldpage));
-       VM_BUG_ON(!PageLocked(newpage));
-       VM_BUG_ON(newpage->mapping != oldpage->mapping);
+       VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
+       VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
+       VM_BUG_ON_PAGE(newpage->mapping != oldpage->mapping, newpage);
 
        stable_node = page_stable_node(newpage);
        if (stable_node) {
-               VM_BUG_ON(stable_node->kpfn != page_to_pfn(oldpage));
+               VM_BUG_ON_PAGE(stable_node->kpfn != page_to_pfn(oldpage), oldpage);
                stable_node->kpfn = page_to_pfn(newpage);
                /*
                 * newpage->mapping was set in advance; now we need smp_wmb()

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7890ce9..72f2d90 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2897,7 +2897,7 @@ struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
        unsigned short id;
        swp_entry_t ent;
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
 
        pc = lookup_page_cgroup(page);
        lock_page_cgroup(pc);
@@ -2931,7 +2931,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
        bool anon;
 
        lock_page_cgroup(pc);
-       VM_BUG_ON(PageCgroupUsed(pc));
+       VM_BUG_ON_PAGE(PageCgroupUsed(pc), page);
        /*
         * we don't need page_cgroup_lock about tail pages, becase they are not
         * accessed by any other context at this point.
@@ -2966,7 +2966,7 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *memcg,
        if (lrucare) {
                if (was_on_lru) {
                        lruvec = mem_cgroup_zone_lruvec(zone, pc->mem_cgroup);
-                       VM_BUG_ON(PageLRU(page));
+                       VM_BUG_ON_PAGE(PageLRU(page), page);
                        SetPageLRU(page);
                        add_page_to_lru_list(page, lruvec, page_lru(page));
                }
@@ -3780,7 +3780,7 @@ void __memcg_kmem_uncharge_pages(struct page *page, int order)
        if (!memcg)
                return;
 
-       VM_BUG_ON(mem_cgroup_is_root(memcg));
+       VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page);
        memcg_uncharge_kmem(memcg, PAGE_SIZE << order);
 }
 #else
@@ -3859,7 +3859,7 @@ static int mem_cgroup_move_account(struct page *page,
        bool anon = PageAnon(page);
 
        VM_BUG_ON(from == to);
-       VM_BUG_ON(PageLRU(page));
+       VM_BUG_ON_PAGE(PageLRU(page), page);
        /*
         * The page is isolated from LRU. So, collapse function
         * will not handle this page. But page splitting can happen.
@@ -3952,7 +3952,7 @@ static int mem_cgroup_move_parent(struct page *page,
                parent = root_mem_cgroup;
 
        if (nr_pages > 1) {
-               VM_BUG_ON(!PageTransHuge(page));
+               VM_BUG_ON_PAGE(!PageTransHuge(page), page);
                flags = compound_lock_irqsave(page);
        }
 
@@ -3986,7 +3986,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
 
        if (PageTransHuge(page)) {
                nr_pages <<= compound_order(page);
-               VM_BUG_ON(!PageTransHuge(page));
+               VM_BUG_ON_PAGE(!PageTransHuge(page), page);
                /*
                 * Never OOM-kill a process for a huge page.  The
                 * fault handler will fall back to regular pages.
@@ -4006,8 +4006,8 @@ int mem_cgroup_newpage_charge(struct page *page,
 {
        if (mem_cgroup_disabled())
                return 0;
-       VM_BUG_ON(page_mapped(page));
-       VM_BUG_ON(page->mapping && !PageAnon(page));
+       VM_BUG_ON_PAGE(page_mapped(page), page);
+       VM_BUG_ON_PAGE(page->mapping && !PageAnon(page), page);
        VM_BUG_ON(!mm);
        return mem_cgroup_charge_common(page, mm, gfp_mask,
                                        MEM_CGROUP_CHARGE_TYPE_ANON);
@@ -4211,7 +4211,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype,
 
        if (PageTransHuge(page)) {
                nr_pages <<= compound_order(page);
-               VM_BUG_ON(!PageTransHuge(page));
+               VM_BUG_ON_PAGE(!PageTransHuge(page), page);
        }
        /*
         * Check if our page_cgroup is valid
@@ -4303,7 +4303,7 @@ void mem_cgroup_uncharge_page(struct page *page)
        /* early check. */
        if (page_mapped(page))
                return;
-       VM_BUG_ON(page->mapping && !PageAnon(page));
+       VM_BUG_ON_PAGE(page->mapping && !PageAnon(page), page);
        /*
         * If the page is in swap cache, uncharge should be deferred
         * to the swap path, which also properly accounts swap usage
@@ -4323,8 +4323,8 @@ void mem_cgroup_uncharge_page(struct page *page)
 
 void mem_cgroup_uncharge_cache_page(struct page *page)
 {
-       VM_BUG_ON(page_mapped(page));
-       VM_BUG_ON(page->mapping);
+       VM_BUG_ON_PAGE(page_mapped(page), page);
+       VM_BUG_ON_PAGE(page->mapping, page);
        __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE, false);
 }
 
@@ -6880,7 +6880,7 @@ static enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma,
        enum mc_target_type ret = MC_TARGET_NONE;
 
        page = pmd_page(pmd);
-       VM_BUG_ON(!page || !PageHead(page));
+       VM_BUG_ON_PAGE(!page || !PageHead(page), page);
        if (!move_anon())
                return ret;
        pc = lookup_page_cgroup(page);

diff --git a/mm/memory.c b/mm/memory.c
index 71d70c0..be6a0c0 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -289,7 +289,7 @@ int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
                        return 0;
                batch = tlb->active;
        }
-       VM_BUG_ON(batch->nr > batch->max);
+       VM_BUG_ON_PAGE(batch->nr > batch->max, page);
 
        return batch->max - batch->nr;
 }
@@ -2702,7 +2702,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                                        goto unwritable_page;
                                }
                        } else
-                               VM_BUG_ON(!PageLocked(old_page));
+                               VM_BUG_ON_PAGE(!PageLocked(old_page), old_page);
 
                        /*
                         * Since we dropped the lock we need to revalidate
@@ -3358,7 +3358,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
        if (unlikely(!(ret & VM_FAULT_LOCKED)))
                lock_page(vmf.page);
        else
-               VM_BUG_ON(!PageLocked(vmf.page));
+               VM_BUG_ON_PAGE(!PageLocked(vmf.page), vmf.page);
 
        /*
         * Should we do an early C-O-W break?
@@ -3395,7 +3395,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                                                goto unwritable_page;
                                        }
                                } else
-                                       VM_BUG_ON(!PageLocked(page));
+                                       VM_BUG_ON_PAGE(!PageLocked(page), page);
                                page_mkwrite = 1;
                        }
                }

diff --git a/mm/migrate.c b/mm/migrate.c
index a8025be..4b3996e 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -499,7 +499,7 @@ void migrate_page_copy(struct page *newpage, struct page *page)
        if (PageUptodate(page))
                SetPageUptodate(newpage);
        if (TestClearPageActive(page)) {
-               VM_BUG_ON(PageUnevictable(page));
+               VM_BUG_ON_PAGE(PageUnevictable(page), page);
                SetPageActive(newpage);
        } else if (TestClearPageUnevictable(page))
                SetPageUnevictable(newpage);
@@ -871,7 +871,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
         * free the metadata, so the page can be freed.
         */
        if (!page->mapping) {
-               VM_BUG_ON(PageAnon(page));
+               VM_BUG_ON_PAGE(PageAnon(page), page);
                if (page_has_private(page)) {
                        try_to_free_buffers(page);
                        goto uncharge;
@@ -1618,7 +1618,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
 {
        int page_lru;
 
-       VM_BUG_ON(compound_order(page) && !PageTransHuge(page));
+       VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page);
 
        /* Avoid migrating to a node that is nearly full */
        if (!migrate_balanced_pgdat(pgdat, 1UL << compound_order(page)))

diff --git a/mm/mlock.c b/mm/mlock.c
index b30adbe..4e1a681 100644 (file)
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -279,8 +279,8 @@ static int __mlock_posix_error_return(long retval)
 static bool __putback_lru_fast_prepare(struct page *page, struct pagevec *pvec,
                int *pgrescued)
 {
-       VM_BUG_ON(PageLRU(page));
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(PageLRU(page), page);
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
 
        if (page_mapcount(page) <= 1 && page_evictable(page)) {
                pagevec_add(pvec, page);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1939f44..f18f016 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -509,12 +509,12 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
                return 0;
 
        if (page_is_guard(buddy) && page_order(buddy) == order) {
-               VM_BUG_ON(page_count(buddy) != 0);
+               VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
                return 1;
        }
 
        if (PageBuddy(buddy) && page_order(buddy) == order) {
-               VM_BUG_ON(page_count(buddy) != 0);
+               VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
                return 1;
        }
        return 0;
@@ -564,8 +564,8 @@ static inline void __free_one_page(struct page *page,
 
        page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1);
 
-       VM_BUG_ON(page_idx & ((1 << order) - 1));
-       VM_BUG_ON(bad_range(zone, page));
+       VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page);
+       VM_BUG_ON_PAGE(bad_range(zone, page), page);
 
        while (order < MAX_ORDER-1) {
                buddy_idx = __find_buddy_index(page_idx, order);
@@ -827,7 +827,7 @@ static inline void expand(struct zone *zone, struct page *page,
                area--;
                high--;
                size >>= 1;
-               VM_BUG_ON(bad_range(zone, &page[size]));
+               VM_BUG_ON_PAGE(bad_range(zone, &page[size]), &page[size]);
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
                if (high < debug_guardpage_minorder()) {
@@ -980,7 +980,7 @@ int move_freepages(struct zone *zone,
 
        for (page = start_page; page <= end_page;) {
                /* Make sure we are not inadvertently changing nodes */
-               VM_BUG_ON(page_to_nid(page) != zone_to_nid(zone));
+               VM_BUG_ON_PAGE(page_to_nid(page) != zone_to_nid(zone), page);
 
                if (!pfn_valid_within(page_to_pfn(page))) {
                        page++;
@@ -1429,8 +1429,8 @@ void split_page(struct page *page, unsigned int order)
 {
        int i;
 
-       VM_BUG_ON(PageCompound(page));
-       VM_BUG_ON(!page_count(page));
+       VM_BUG_ON_PAGE(PageCompound(page), page);
+       VM_BUG_ON_PAGE(!page_count(page), page);
 
 #ifdef CONFIG_KMEMCHECK
        /*
@@ -1577,7 +1577,7 @@ again:
        zone_statistics(preferred_zone, zone, gfp_flags);
        local_irq_restore(flags);
 
-       VM_BUG_ON(bad_range(zone, page));
+       VM_BUG_ON_PAGE(bad_range(zone, page), page);
        if (prep_new_page(page, order, gfp_flags))
                goto again;
        return page;
@@ -6021,7 +6021,7 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags,
        pfn = page_to_pfn(page);
        bitmap = get_pageblock_bitmap(zone, pfn);
        bitidx = pfn_to_bitidx(zone, pfn);
-       VM_BUG_ON(!zone_spans_pfn(zone, pfn));
+       VM_BUG_ON_PAGE(!zone_spans_pfn(zone, pfn), page);
 
        for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1)
                if (flags & value)
@@ -6539,3 +6539,4 @@ void dump_page(struct page *page, char *reason)
 {
        dump_page_badflags(page, reason, 0);
 }
+EXPORT_SYMBOL_GPL(dump_page);

diff --git a/mm/page_io.c b/mm/page_io.c
index 8c79a47..7247be6 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -320,8 +320,8 @@ int swap_readpage(struct page *page)
        int ret = 0;
        struct swap_info_struct *sis = page_swap_info(page);
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(PageUptodate(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(PageUptodate(page), page);
        if (frontswap_load(page) == 0) {
                SetPageUptodate(page);
                unlock_page(page);

diff --git a/mm/rmap.c b/mm/rmap.c
index 962e2a1..2dcd335 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -894,9 +894,9 @@ void page_move_anon_rmap(struct page *page,
 {
        struct anon_vma *anon_vma = vma->anon_vma;
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        VM_BUG_ON(!anon_vma);
-       VM_BUG_ON(page->index != linear_page_index(vma, address));
+       VM_BUG_ON_PAGE(page->index != linear_page_index(vma, address), page);
 
        anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
        page->mapping = (struct address_space *) anon_vma;
@@ -995,7 +995,7 @@ void do_page_add_anon_rmap(struct page *page,
        if (unlikely(PageKsm(page)))
                return;
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        /* address might be in next vma when migration races vma_adjust */
        if (first)
                __page_set_anon_rmap(page, vma, address, exclusive);
@@ -1481,7 +1481,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
                .anon_lock = page_lock_anon_vma_read,
        };
 
-       VM_BUG_ON(!PageHuge(page) && PageTransHuge(page));
+       VM_BUG_ON_PAGE(!PageHuge(page) && PageTransHuge(page), page);
 
        /*
         * During exec, a temporary VMA is setup and later moved.
@@ -1533,7 +1533,7 @@ int try_to_munlock(struct page *page)
 
        };
 
-       VM_BUG_ON(!PageLocked(page) || PageLRU(page));
+       VM_BUG_ON_PAGE(!PageLocked(page) || PageLRU(page), page);
 
        ret = rmap_walk(page, &rwc);
        return ret;

diff --git a/mm/shmem.c b/mm/shmem.c
index 902a148..8156f95 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -285,8 +285,8 @@ static int shmem_add_to_page_cache(struct page *page,
 {
        int error;
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(!PageSwapBacked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
 
        page_cache_get(page);
        page->mapping = mapping;
@@ -491,7 +491,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
                                continue;
                        if (!unfalloc || !PageUptodate(page)) {
                                if (page->mapping == mapping) {
-                                       VM_BUG_ON(PageWriteback(page));
+                                       VM_BUG_ON_PAGE(PageWriteback(page), page);
                                        truncate_inode_page(mapping, page);
                                }
                        }
@@ -568,7 +568,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
                        lock_page(page);
                        if (!unfalloc || !PageUptodate(page)) {
                                if (page->mapping == mapping) {
-                                       VM_BUG_ON(PageWriteback(page));
+                                       VM_BUG_ON_PAGE(PageWriteback(page), page);
                                        truncate_inode_page(mapping, page);
                                }
                        }

diff --git a/mm/slub.c b/mm/slub.c
index 545a170..34bb8c6 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1559,7 +1559,7 @@ static inline void *acquire_slab(struct kmem_cache *s,
                new.freelist = freelist;
        }
 
-       VM_BUG_ON(new.frozen);
+       VM_BUG_ON_PAGE(new.frozen, &new);
        new.frozen = 1;
 
        if (!__cmpxchg_double_slab(s, page,
@@ -1812,7 +1812,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
                        set_freepointer(s, freelist, prior);
                        new.counters = counters;
                        new.inuse--;
-                       VM_BUG_ON(!new.frozen);
+                       VM_BUG_ON_PAGE(!new.frozen, &new);
 
                } while (!__cmpxchg_double_slab(s, page,
                        prior, counters,
@@ -1840,7 +1840,7 @@ redo:
 
        old.freelist = page->freelist;
        old.counters = page->counters;
-       VM_BUG_ON(!old.frozen);
+       VM_BUG_ON_PAGE(!old.frozen, &old);
 
        /* Determine target state of the slab */
        new.counters = old.counters;
@@ -1952,7 +1952,7 @@ static void unfreeze_partials(struct kmem_cache *s,
 
                        old.freelist = page->freelist;
                        old.counters = page->counters;
-                       VM_BUG_ON(!old.frozen);
+                       VM_BUG_ON_PAGE(!old.frozen, &old);
 
                        new.counters = old.counters;
                        new.freelist = old.freelist;
@@ -2225,7 +2225,7 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page)
                counters = page->counters;
 
                new.counters = counters;
-               VM_BUG_ON(!new.frozen);
+               VM_BUG_ON_PAGE(!new.frozen, &new);
 
                new.inuse = page->objects;
                new.frozen = freelist != NULL;
@@ -2319,7 +2319,7 @@ load_freelist:
         * page is pointing to the page from which the objects are obtained.
         * That page must be frozen for per cpu allocations to work.
         */
-       VM_BUG_ON(!c->page->frozen);
+       VM_BUG_ON_PAGE(!c->page->frozen, c->page);
        c->freelist = get_freepointer(s, freelist);
        c->tid = next_tid(c->tid);
        local_irq_restore(flags);

diff --git a/mm/swap.c b/mm/swap.c
index d1100b6..b31ba67 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -57,7 +57,7 @@ static void __page_cache_release(struct page *page)
 
                spin_lock_irqsave(&zone->lru_lock, flags);
                lruvec = mem_cgroup_page_lruvec(page, zone);
-               VM_BUG_ON(!PageLRU(page));
+               VM_BUG_ON_PAGE(!PageLRU(page), page);
                __ClearPageLRU(page);
                del_page_from_lru_list(page, lruvec, page_off_lru(page));
                spin_unlock_irqrestore(&zone->lru_lock, flags);
@@ -130,8 +130,8 @@ static void put_compound_page(struct page *page)
                         * __split_huge_page_refcount cannot race
                         * here.
                         */
-                       VM_BUG_ON(!PageHead(page_head));
-                       VM_BUG_ON(page_mapcount(page) != 0);
+                       VM_BUG_ON_PAGE(!PageHead(page_head), page_head);
+                       VM_BUG_ON_PAGE(page_mapcount(page) != 0, page);
                        if (put_page_testzero(page_head)) {
                                /*
                                 * If this is the tail of a slab
@@ -148,7 +148,7 @@ static void put_compound_page(struct page *page)
                                 * the compound page enters the buddy
                                 * allocator.
                                 */
-                               VM_BUG_ON(PageSlab(page_head));
+                               VM_BUG_ON_PAGE(PageSlab(page_head), page_head);
                                __put_compound_page(page_head);
                        }
                        return;
@@ -199,7 +199,7 @@ out_put_single:
                                __put_single_page(page);
                        return;
                }
-               VM_BUG_ON(page_head != page->first_page);
+               VM_BUG_ON_PAGE(page_head != page->first_page, page);
                /*
                 * We can release the refcount taken by
                 * get_page_unless_zero() now that
@@ -207,12 +207,12 @@ out_put_single:
                 * compound_lock.
                 */
                if (put_page_testzero(page_head))
-                       VM_BUG_ON(1);
+                       VM_BUG_ON_PAGE(1, page_head);
                /* __split_huge_page_refcount will wait now */
-               VM_BUG_ON(page_mapcount(page) <= 0);
+               VM_BUG_ON_PAGE(page_mapcount(page) <= 0, page);
                atomic_dec(&page->_mapcount);
-               VM_BUG_ON(atomic_read(&page_head->_count) <= 0);
-               VM_BUG_ON(atomic_read(&page->_count) != 0);
+               VM_BUG_ON_PAGE(atomic_read(&page_head->_count) <= 0, page_head);
+               VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page);
                compound_unlock_irqrestore(page_head, flags);
 
                if (put_page_testzero(page_head)) {
@@ -223,7 +223,7 @@ out_put_single:
                }
        } else {
                /* page_head is a dangling pointer */
-               VM_BUG_ON(PageTail(page));
+               VM_BUG_ON_PAGE(PageTail(page), page);
                goto out_put_single;
        }
 }
@@ -264,7 +264,7 @@ bool __get_page_tail(struct page *page)
                         * page. __split_huge_page_refcount
                         * cannot race here.
                         */
-                       VM_BUG_ON(!PageHead(page_head));
+                       VM_BUG_ON_PAGE(!PageHead(page_head), page_head);
                        __get_page_tail_foll(page, true);
                        return true;
                } else {
@@ -604,8 +604,8 @@ EXPORT_SYMBOL(__lru_cache_add);
  */
 void lru_cache_add(struct page *page)
 {
-       VM_BUG_ON(PageActive(page) && PageUnevictable(page));
-       VM_BUG_ON(PageLRU(page));
+       VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
+       VM_BUG_ON_PAGE(PageLRU(page), page);
        __lru_cache_add(page);
 }
 
@@ -846,7 +846,7 @@ void release_pages(struct page **pages, int nr, int cold)
                        }
 
                        lruvec = mem_cgroup_page_lruvec(page, zone);
-                       VM_BUG_ON(!PageLRU(page));
+                       VM_BUG_ON_PAGE(!PageLRU(page), page);
                        __ClearPageLRU(page);
                        del_page_from_lru_list(page, lruvec, page_off_lru(page));
                }
@@ -888,9 +888,9 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
 {
        const int file = 0;
 
-       VM_BUG_ON(!PageHead(page));
-       VM_BUG_ON(PageCompound(page_tail));
-       VM_BUG_ON(PageLRU(page_tail));
+       VM_BUG_ON_PAGE(!PageHead(page), page);
+       VM_BUG_ON_PAGE(PageCompound(page_tail), page);
+       VM_BUG_ON_PAGE(PageLRU(page_tail), page);
        VM_BUG_ON(NR_CPUS != 1 &&
                  !spin_is_locked(&lruvec_zone(lruvec)->lru_lock));
 
@@ -929,7 +929,7 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
        int active = PageActive(page);
        enum lru_list lru = page_lru(page);
 
-       VM_BUG_ON(PageLRU(page));
+       VM_BUG_ON_PAGE(PageLRU(page), page);
 
        SetPageLRU(page);
        add_page_to_lru_list(page, lruvec, lru);

diff --git a/mm/swap_state.c b/mm/swap_state.c
index e6f15f8..98e85e9 100644 (file)
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -83,9 +83,9 @@ int __add_to_swap_cache(struct page *page, swp_entry_t entry)
        int error;
        struct address_space *address_space;
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(PageSwapCache(page));
-       VM_BUG_ON(!PageSwapBacked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(PageSwapCache(page), page);
+       VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
 
        page_cache_get(page);
        SetPageSwapCache(page);
@@ -139,9 +139,9 @@ void __delete_from_swap_cache(struct page *page)
        swp_entry_t entry;
        struct address_space *address_space;
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(!PageSwapCache(page));
-       VM_BUG_ON(PageWriteback(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(!PageSwapCache(page), page);
+       VM_BUG_ON_PAGE(PageWriteback(page), page);
 
        entry.val = page_private(page);
        address_space = swap_address_space(entry);
@@ -165,8 +165,8 @@ int add_to_swap(struct page *page, struct list_head *list)
        swp_entry_t entry;
        int err;
 
-       VM_BUG_ON(!PageLocked(page));
-       VM_BUG_ON(!PageUptodate(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
+       VM_BUG_ON_PAGE(!PageUptodate(page), page);
 
        entry = get_swap_page();
        if (!entry.val)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 612a7c9..d443dea 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -906,7 +906,7 @@ int reuse_swap_page(struct page *page)
 {
        int count;
 
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
        if (unlikely(PageKsm(page)))
                return 0;
        count = page_mapcount(page);
@@ -926,7 +926,7 @@ int reuse_swap_page(struct page *page)
  */
 int try_to_free_swap(struct page *page)
 {
-       VM_BUG_ON(!PageLocked(page));
+       VM_BUG_ON_PAGE(!PageLocked(page), page);
 
        if (!PageSwapCache(page))
                return 0;
@@ -2714,7 +2714,7 @@ struct swap_info_struct *page_swap_info(struct page *page)
  */
 struct address_space *__page_file_mapping(struct page *page)
 {
-       VM_BUG_ON(!PageSwapCache(page));
+       VM_BUG_ON_PAGE(!PageSwapCache(page), page);
        return page_swap_info(page)->swap_file->f_mapping;
 }
 EXPORT_SYMBOL_GPL(__page_file_mapping);
@@ -2722,7 +2722,7 @@ EXPORT_SYMBOL_GPL(__page_file_mapping);
 pgoff_t __page_file_index(struct page *page)
 {
        swp_entry_t swap = { .val = page_private(page) };
-       VM_BUG_ON(!PageSwapCache(page));
+       VM_BUG_ON_PAGE(!PageSwapCache(page), page);
        return swp_offset(swap);
 }
 EXPORT_SYMBOL_GPL(__page_file_index);

diff --git a/mm/vmscan.c b/mm/vmscan.c
index eea668d..2254f36 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -603,7 +603,7 @@ void putback_lru_page(struct page *page)
        bool is_unevictable;
        int was_unevictable = PageUnevictable(page);
 
-       VM_BUG_ON(PageLRU(page));
+       VM_BUG_ON_PAGE(PageLRU(page), page);
 
 redo:
        ClearPageUnevictable(page);
@@ -794,8 +794,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
                if (!trylock_page(page))
                        goto keep;
 
-               VM_BUG_ON(PageActive(page));
-               VM_BUG_ON(page_zone(page) != zone);
+               VM_BUG_ON_PAGE(PageActive(page), page);
+               VM_BUG_ON_PAGE(page_zone(page) != zone, page);
 
                sc->nr_scanned++;
 
@@ -1079,14 +1079,14 @@ activate_locked:
                /* Not a candidate for swapping, so reclaim swap space. */
                if (PageSwapCache(page) && vm_swap_full())
                        try_to_free_swap(page);
-               VM_BUG_ON(PageActive(page));
+               VM_BUG_ON_PAGE(PageActive(page), page);
                SetPageActive(page);
                pgactivate++;
 keep_locked:
                unlock_page(page);
 keep:
                list_add(&page->lru, &ret_pages);
-               VM_BUG_ON(PageLRU(page) || PageUnevictable(page));
+               VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page), page);
        }
 
        free_hot_cold_page_list(&free_pages, 1);
@@ -1240,7 +1240,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
                page = lru_to_page(src);
                prefetchw_prev_lru_page(page, src, flags);
 
-               VM_BUG_ON(!PageLRU(page));
+               VM_BUG_ON_PAGE(!PageLRU(page), page);
 
                switch (__isolate_lru_page(page, mode)) {
                case 0:
@@ -1295,7 +1295,7 @@ int isolate_lru_page(struct page *page)
 {
        int ret = -EBUSY;
 
-       VM_BUG_ON(!page_count(page));
+       VM_BUG_ON_PAGE(!page_count(page), page);
 
        if (PageLRU(page)) {
                struct zone *zone = page_zone(page);
@@ -1366,7 +1366,7 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
                struct page *page = lru_to_page(page_list);
                int lru;
 
-               VM_BUG_ON(PageLRU(page));
+               VM_BUG_ON_PAGE(PageLRU(page), page);
                list_del(&page->lru);
                if (unlikely(!page_evictable(page))) {
                        spin_unlock_irq(&zone->lru_lock);
@@ -1586,7 +1586,7 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
                page = lru_to_page(list);
                lruvec = mem_cgroup_page_lruvec(page, zone);
 
-               VM_BUG_ON(PageLRU(page));
+               VM_BUG_ON_PAGE(PageLRU(page), page);
                SetPageLRU(page);
 
                nr_pages = hpage_nr_pages(page);
@@ -3701,7 +3701,7 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
                if (page_evictable(page)) {
                        enum lru_list lru = page_lru_base_type(page);
 
-                       VM_BUG_ON(PageActive(page));
+                       VM_BUG_ON_PAGE(PageActive(page), page);
                        ClearPageUnevictable(page);
                        del_page_from_lru_list(page, lruvec, LRU_UNEVICTABLE);
                        add_page_to_lru_list(page, lruvec, lru);