mm: hugetlb: return immediately for hugetlb page in __delete_from_page_cache()
We avoid calling __mod_node_page_state(NR_FILE_PAGES) for hugetlb page now, but it's not enough because later code doesn't handle hugetlb properly. Actually in our testing, WARN_ON_ONCE(PageDirty(page)) at the end of this function fires for hugetlb, which makes no sense. So we should return immediately for hugetlb pages. Link: http://lkml.kernel.org/r/1496305019-5493-3-git-send-email-n-horiguchi@ah.jp.nec.com Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -239,14 +239,16 @@ void __delete_from_page_cache(struct page *page, void *shadow)
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/* Leave page->index set: truncation lookup relies upon it */
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/* hugetlb pages do not participate in page cache accounting. */
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if (!PageHuge(page))
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__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
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if (PageHuge(page))
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return;
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__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
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if (PageSwapBacked(page)) {
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__mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr);
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if (PageTransHuge(page))
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__dec_node_page_state(page, NR_SHMEM_THPS);
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} else {
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VM_BUG_ON_PAGE(PageTransHuge(page) && !PageHuge(page), page);
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VM_BUG_ON_PAGE(PageTransHuge(page), page);
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}
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/*
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