The patch titled
thp: add debug checks for mapcount related invariants
has been removed from the -mm tree. Its filename was
thp-add-debug-checks-for-mapcount-related-invariants.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: thp: add debug checks for mapcount related invariants
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN mm/memory.c~thp-add-debug-checks-for-mapcount-related-invariants mm/memory.c
--- a/mm/memory.c~thp-add-debug-checks-for-mapcount-related-invariants
+++ a/mm/memory.c
@@ -804,6 +804,7 @@ static inline int copy_pmd_range(struct
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*src_pmd)) {
int err;
+ VM_BUG_ON(next-addr != HPAGE_PMD_SIZE);
err = copy_huge_pmd(dst_mm, src_mm,
dst_pmd, src_pmd, addr, vma);
if (err == -ENOMEM)
@@ -1015,9 +1016,10 @@ static inline unsigned long zap_pmd_rang
do {
next = pmd_addr_end(addr, end);
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);
- else if (zap_huge_pmd(tlb, vma, pmd)) {
+ } else if (zap_huge_pmd(tlb, vma, pmd)) {
(*zap_work)--;
continue;
}
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
origin.patch
thp-add-pagetranscompound.patch
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