thp: split_huge_page_mm/vma

split_huge_page_pmd compat code.  Each one of those would need to be
expanded to hundred of lines of complex code without a fully reliable
split_huge_page_pmd design.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 61fb985..863f875 100644 (file)
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -179,6 +179,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
        if (pud_none_or_clear_bad(pud))
                goto out;
        pmd = pmd_offset(pud, 0xA0000);
+       split_huge_page_pmd(mm, pmd);
        if (pmd_none_or_clear_bad(pmd))
                goto out;
        pte = pte_offset_map_lock(mm, pmd, 0xA0000, &ptl);

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e6d3512..83b7df3 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -514,6 +514,7 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
+               split_huge_page_pmd(vma->vm_mm, pmd);
                if (pmd_none_or_clear_bad(pmd))
                        continue;
                if (check_pte_range(vma, pmd, addr, next, nodes,

diff --git a/mm/mincore.c b/mm/mincore.c
index 9ac42dc..9959bb4 100644 (file)
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -154,6 +154,7 @@ static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
+               split_huge_page_pmd(vma->vm_mm, pmd);
                if (pmd_none_or_clear_bad(pmd))
                        mincore_unmapped_range(vma, addr, next, vec);
                else

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 4c51338..bd27db6 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -88,6 +88,7 @@ static inline void change_pmd_range(struct mm_struct *mm, pud_t *pud,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
+               split_huge_page_pmd(mm, pmd);
                if (pmd_none_or_clear_bad(pmd))
                        continue;
                change_pte_range(mm, pmd, addr, next, newprot, dirty_accountable);

diff --git a/mm/mremap.c b/mm/mremap.c
index b09eefa..9925b63 100644 (file)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -41,6 +41,7 @@ static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr)
                return NULL;
 
        pmd = pmd_offset(pud, addr);
+       split_huge_page_pmd(mm, pmd);
        if (pmd_none_or_clear_bad(pmd))
                return NULL;
 

diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 38cc58b..7cfa6ae 100644 (file)
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -34,6 +34,7 @@ static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
+               split_huge_page_pmd(walk->mm, pmd);
                if (pmd_none_or_clear_bad(pmd)) {
                        if (walk->pte_hole)
                                err = walk->pte_hole(addr, next, walk);