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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2016-07-29 01:48:38 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-29 02:07:41 +0300
commit7c7fd82556c61113b6327c9696b347a82b215072 (patch)
tree99499ad717a26aa030d1f7cd6bea0c918f65d363 /mm
parent91fd8b95d656dcd3f0a4e17b6583e7b0220b0747 (diff)
downloadlinux-7c7fd82556c61113b6327c9696b347a82b215072.tar.xz
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 'mm')
-rw-r--r--mm/hugetlb.c1
-rw-r--r--mm/memory-failure.c2
2 files changed, 0 insertions, 3 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index abc1c5fb7222..213ff90903a6 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4391,7 +4391,6 @@ follow_huge_pud(struct mm_struct *mm, unsigned long address,
/*
* This function is called from memory failure code.
- * Assume the caller holds page lock of the head page.
*/
int dequeue_hwpoisoned_huge_page(struct page *hpage)
{
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);