The patch titled
Subject: mm, thp: fix locking inconsistency in collapse_huge_page
has been removed from the -mm tree. Its filename was
mm-thp-fix-locking-inconsistency-in-collapse_huge_page.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Ebru Akagunduz <ebru.akagunduz@xxxxxxxxx>
Subject: mm, thp: fix locking inconsistency in collapse_huge_page
After creating revalidate vma function, locking inconsistency occured
due to directing the code path to wrong label. This patch directs
to correct label and fix the inconsistency.
Related commit that caused inconsistency:
http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=da4360877094368f6dfe75bbe804b0f0a5d575b0
Link: http://lkml.kernel.org/r/1464956884-4644-1-git-send-email-ebru.akagunduz@xxxxxxxxx
Link: http://lkml.kernel.org/r/1466021202-61880-4-git-send-email-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Ebru Akagunduz <ebru.akagunduz@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff -puN mm/huge_memory.c~mm-thp-fix-locking-inconsistency-in-collapse_huge_page mm/huge_memory.c
--- a/mm/huge_memory.c~mm-thp-fix-locking-inconsistency-in-collapse_huge_page
+++ a/mm/huge_memory.c
@@ -2483,13 +2483,18 @@ static void collapse_huge_page(struct mm
down_read(&mm->mmap_sem);
result = hugepage_vma_revalidate(mm, address);
- if (result)
- goto out;
+ if (result) {
+ mem_cgroup_cancel_charge(new_page, memcg, true);
+ up_read(&mm->mmap_sem);
+ goto out_nolock;
+ }
pmd = mm_find_pmd(mm, address);
if (!pmd) {
result = SCAN_PMD_NULL;
- goto out;
+ mem_cgroup_cancel_charge(new_page, memcg, true);
+ up_read(&mm->mmap_sem);
+ goto out_nolock;
}
/*
@@ -2498,8 +2503,9 @@ static void collapse_huge_page(struct mm
* Continuing to collapse causes inconsistency.
*/
if (!__collapse_huge_page_swapin(mm, vma, address, pmd)) {
+ mem_cgroup_cancel_charge(new_page, memcg, true);
up_read(&mm->mmap_sem);
- goto out;
+ goto out_nolock;
}
up_read(&mm->mmap_sem);
_
Patches currently in -mm which might be from ebru.akagunduz@xxxxxxxxx are
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