xtensa: use buddy allocator for PTE table

At the moment xtensa uses slab allocator for PTE table.  It doesn't work
with enabled split page table lock: slab uses page->slab_cache and
page->first_page for its pages.  These fields share stroage with
page->ptl.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/xtensa/include/asm/pgalloc.h b/arch/xtensa/include/asm/pgalloc.h
index b8774f1..d38eb92 100644 (file)
--- a/arch/xtensa/include/asm/pgalloc.h
+++ b/arch/xtensa/include/asm/pgalloc.h
@@ -38,14 +38,18 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
        free_page((unsigned long)pgd);
 }
 
-/* Use a slab cache for the pte pages (see also sparc64 implementation) */
-
-extern struct kmem_cache *pgtable_cache;
-
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
                                         unsigned long address)
 {
-       return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
+       pte_t *ptep;
+       int i;
+
+       ptep = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+       if (!ptep)
+               return NULL;
+       for (i = 0; i < 1024; i++)
+               pte_clear(NULL, 0, ptep + i);
+       return ptep;
 }
 
 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
@@ -59,7 +63,7 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
                return NULL;
        page = virt_to_page(pte);
        if (!pgtable_page_ctor(page)) {
-               kmem_cache_free(pgtable_cache, pte);
+               __free_page(page);
                return NULL;
        }
        return page;
@@ -67,13 +71,13 @@ static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 {
-       kmem_cache_free(pgtable_cache, pte);
+       free_page((unsigned long)pte);
 }
 
 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
        pgtable_page_dtor(pte);
-       kmem_cache_free(pgtable_cache, page_address(pte));
+       __free_page(pte);
 }
 #define pmd_pgtable(pmd) pmd_page(pmd)
 

diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 0fdf5d0..2164462 100644 (file)
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -220,12 +220,11 @@ extern unsigned long empty_zero_page[1024];
 #ifdef CONFIG_MMU
 extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
 extern void paging_init(void);
-extern void pgtable_cache_init(void);
 #else
 # define swapper_pg_dir NULL
 static inline void paging_init(void) { }
-static inline void pgtable_cache_init(void) { }
 #endif
+static inline void pgtable_cache_init(void) { }
 
 /*
  * The pmd contains the kernel virtual address of the pte page.

diff --git a/arch/xtensa/mm/mmu.c b/arch/xtensa/mm/mmu.c
index a107757..c43771c 100644 (file)
--- a/arch/xtensa/mm/mmu.c
+++ b/arch/xtensa/mm/mmu.c
@@ -50,23 +50,3 @@ void __init init_mmu(void)
         */
        set_ptevaddr_register(PGTABLE_START);
 }
-
-struct kmem_cache *pgtable_cache __read_mostly;
-
-static void pgd_ctor(void *addr)
-{
-       pte_t *ptep = (pte_t *)addr;
-       int i;
-
-       for (i = 0; i < 1024; i++, ptep++)
-               pte_clear(NULL, 0, ptep);
-
-}
-
-void __init pgtable_cache_init(void)
-{
-       pgtable_cache = kmem_cache_create("pgd",
-                       PAGE_SIZE, PAGE_SIZE,
-                       SLAB_HWCACHE_ALIGN,
-                       pgd_ctor);
-}