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mm, thp: fix locking inconsistency in collapse_huge_page

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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>
This commit is contained in:
Ebru Akagunduz 2016-07-26 15:25:09 -07:00 committed by Linus Torvalds
parent 7269586252
commit 8024ee2a09
1 changed files with 10 additions and 4 deletions
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14
mm/huge_memory.c
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@ -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);