From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
split_huge_page_mm/vma 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_mm/vma functionality.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
---
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
--- 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
if (pud_none_or_clear_bad(pud))
goto out;
pmd = pmd_offset(pud, 0xA0000);
+ split_huge_page_mm(mm, 0xA0000, 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
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -446,6 +446,7 @@ static inline int check_pmd_range(struct
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
+ split_huge_page_vma(vma, 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
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -132,6 +132,7 @@ static long do_mincore(unsigned long add
if (pud_none_or_clear_bad(pud))
goto none_mapped;
pmd = pmd_offset(pud, addr);
+ split_huge_page_vma(vma, pmd);
if (pmd_none_or_clear_bad(pmd))
goto none_mapped;
diff --git a/mm/mprotect.c b/mm/mprotect.c
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -89,6 +89,7 @@ static inline void change_pmd_range(stru
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
+ split_huge_page_mm(mm, addr, 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
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -42,6 +42,7 @@ static pmd_t *get_old_pmd(struct mm_stru
return NULL;
pmd = pmd_offset(pud, addr);
+ split_huge_page_mm(mm, addr, pmd);
if (pmd_none_or_clear_bad(pmd))
return NULL;
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -34,6 +34,7 @@ static int walk_pmd_range(pud_t *pud, un
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
+ split_huge_page_mm(walk->mm, addr, pmd);
if (pmd_none_or_clear_bad(pmd)) {
if (walk->pte_hole)
err = walk->pte_hole(addr, next, walk);
--
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