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mm: hugetlb: fix missing put_page in gather_surplus_pages()

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The VM_BUG_ON_PAGE avoids the generation of any code, even if that
expression has side-effects when !CONFIG_DEBUG_VM.

Link: https://lkml.kernel.org/r/20210126031009.96266-1-songmuchun@bytedance.com
Fixes: e5dfacebe4 ("mm/hugetlb.c: just use put_page_testzero() instead of page_count()")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muchun Song 2021-02-04 18:33:00 -08:00 committed by Linus Torvalds
parent 28abcc9631
commit e558464be9
1 changed files with 4 additions and 1 deletions
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5
mm/hugetlb.c
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@ -2047,13 +2047,16 @@ static int gather_surplus_pages(struct hstate *h, long delta)
/* Free the needed pages to the hugetlb pool */
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
int zeroed;
if ((--needed) < 0)
break;
/*
* This page is now managed by the hugetlb allocator and has
* no users -- drop the buddy allocator's reference.
*/
VM_BUG_ON_PAGE(!put_page_testzero(page), page);
zeroed = put_page_testzero(page);
VM_BUG_ON_PAGE(!zeroed, page);
enqueue_huge_page(h, page);
}
free: