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authorEbru Akagunduz <ebru.akagunduz@gmail.com>2016-07-26 15:25:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit8024ee2a09c6135102505bab4105e1410c279832 (patch)
treeeaaec4cb322a8cbc361f4142465e2643c92cab96 /mm/huge_memory.c
parent72695862529b4190b58c779809bc01ac55ea6605 (diff)
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@gmail.com Link: http://lkml.kernel.org/r/1466021202-61880-4-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b54559058d30..1841e0ceac23 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2483,13 +2483,18 @@ static void collapse_huge_page(struct mm_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_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);