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| author |   Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2016-07-28 15:48:38 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-28 16:07:41 -0700 |
| commit | 7c7fd82556c61113b6327c9696b347a82b215072 (patch) | |
| tree | 99499ad717a26aa030d1f7cd6bea0c918f65d363 /mm/memory-failure.c | |
| parent | make __section_nr() more efficient (diff) | |
| download | linux-dev-7c7fd82556c61113b6327c9696b347a82b215072.tar.xz linux-dev-7c7fd82556c61113b6327c9696b347a82b215072.zip | |
mm: hwpoison: remove incorrect comments
dequeue_hwpoisoned_huge_page() can be called without page lock hold, so
let's remove incorrect comment.
The reason why the page lock is not really needed is that
dequeue_hwpoisoned_huge_page() checks page_huge_active() inside
hugetlb_lock, which allows us to avoid trying to dequeue a hugepage that
are just allocated but not linked to active list yet, even without
taking page lock.
Link: http://lkml.kernel.org/r/20160720092901.GA15995@www9186uo.sakura.ne.jp
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reported-by: Zhan Chen <zhanc1@andrew.cmu.edu>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | mm/memory-failure.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 11de752ccaf5..de88f33519c0 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -741,8 +741,6 @@ static int me_huge_page(struct page *p, unsigned long pfn) * page->lru because it can be used in other hugepage operations, * such as __unmap_hugepage_range() and gather_surplus_pages(). * So instead we use page_mapping() and PageAnon(). - * We assume that this function is called with page lock held, - * so there is no race between isolation and mapping/unmapping. */ if (!(page_mapping(hpage) || PageAnon(hpage))) { res = dequeue_hwpoisoned_huge_page(hpage); |