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mm/hugetlb.c: just use put_page_testzero() instead of page_count() 

We test the page reference count is zero or not here, it can be a bug here
if page refercence count is not zero.  So we can just use
put_page_testzero() instead of page_count().

Link: https://lkml.kernel.org/r/20201007170949.GA6416@rlk
Signed-off-by: Hui Su <sh_def@163.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hui Su 2020-12-14 19:11:55 -08:00 committed by Linus Torvalds
parent 3f4b815a43
commit e5dfacebe4
1 changed files with 1 additions and 2 deletions
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mm/hugetlb.c
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@ -2014,8 +2014,7 @@ static int gather_surplus_pages(struct hstate *h, int delta)
* This page is now managed by the hugetlb allocator and has
* no users -- drop the buddy allocator's reference.
*/
put_page_testzero(page);
VM_BUG_ON_PAGE(page_count(page), page);
VM_BUG_ON_PAGE(!put_page_testzero(page), page);
enqueue_huge_page(h, page);
}
free: