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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>
hifive-unleashed-5.1
Naoya Horiguchi 2017-07-10 15:47:35 -07:00 committed by Linus Torvalds
parent 243abd5b78
commit 09612fa653
1 changed files with 5 additions and 3 deletions
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8
mm/filemap.c
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@ -239,14 +239,16 @@ void __delete_from_page_cache(struct page *page, void *shadow)
/* Leave page->index set: truncation lookup relies upon it */
/* hugetlb pages do not participate in page cache accounting. */
if (!PageHuge(page))
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
if (PageHuge(page))
return;
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
if (PageSwapBacked(page)) {
__mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr);
if (PageTransHuge(page))
__dec_node_page_state(page, NR_SHMEM_THPS);
} else {
VM_BUG_ON_PAGE(PageTransHuge(page) && !PageHuge(page), page);
VM_BUG_ON_PAGE(PageTransHuge(page), page);
}
/*