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thp: add debug checks for mapcount related invariants

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Add debug checks for invariants that if broken could lead to mapcount vs
page_mapcount debug checks to trigger later in split_huge_page.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:47:15 -08:00 • committed by Linus Torvalds
parent 05b258e997
commit 14d1a55cd2
1 changed files with 4 additions and 2 deletions
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6
mm/memory.c
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@ -804,6 +804,7 @@ static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src
next = pmd_addr_end(addr, end); next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*src_pmd)) { if (pmd_trans_huge(*src_pmd)) {
int err; int err;
VM_BUG_ON(next-addr != HPAGE_PMD_SIZE);
err = copy_huge_pmd(dst_mm, src_mm, err = copy_huge_pmd(dst_mm, src_mm,
dst_pmd, src_pmd, addr, vma); dst_pmd, src_pmd, addr, vma);
if (err == -ENOMEM) if (err == -ENOMEM)
@ -1015,9 +1016,10 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
do { do {
next = pmd_addr_end(addr, end); next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) { if (pmd_trans_huge(*pmd)) {
if (next-addr != HPAGE_PMD_SIZE) if (next-addr != HPAGE_PMD_SIZE) {
VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
split_huge_page_pmd(vma->vm_mm, pmd); split_huge_page_pmd(vma->vm_mm, pmd);
else if (zap_huge_pmd(tlb, vma, pmd)) { } else if (zap_huge_pmd(tlb, vma, pmd)) {
(*zap_work)--; (*zap_work)--;
continue; continue;
} }