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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>
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@@ -2014,8 +2014,7 @@ retry:
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* This page is now managed by the hugetlb allocator and has
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* no users -- drop the buddy allocator's reference.
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*/
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put_page_testzero(page);
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VM_BUG_ON_PAGE(page_count(page), page);
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VM_BUG_ON_PAGE(!put_page_testzero(page), page);
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enqueue_huge_page(h, page);
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}
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free:
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