The patch titled Subject: mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb has been added to the -mm tree. Its filename is mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Subject: mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb Hugetlb pages have ->index in size of the huge pages (PMD_SIZE or PUD_SIZE), not in PAGE_SIZE as other types of pages. This means we cannot user page_to_pgoff() to check whether we've got the right page for the radix-tree index. Let's introduce page_to_index() which would return radix-tree index for given page. We will be able to get rid of this once hugetlb will be switched to multi-order entries. Fixes: fc127da085c2 ("truncate: handle file thp") Link: http://lkml.kernel.org/r/20161123093053.mjbnvn5zwxw5e6lk@xxxxxxxxxxxxxxxxxx Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reported-by: Doug Nelson <doug.nelson@xxxxxxxxx> Tested-by: Doug Nelson <doug.nelson@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [4.8+] Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/pagemap.h | 21 +++++++++++++++------ mm/truncate.c | 8 ++++---- 2 files changed, 19 insertions(+), 10 deletions(-) diff -puN include/linux/pagemap.h~mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb include/linux/pagemap.h --- a/include/linux/pagemap.h~mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb +++ a/include/linux/pagemap.h @@ -374,16 +374,13 @@ static inline struct page *read_mapping_ } /* - * Get the offset in PAGE_SIZE. - * (TODO: hugepage should have ->index in PAGE_SIZE) + * Get index of the page with in radix-tree + * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE) */ -static inline pgoff_t page_to_pgoff(struct page *page) +static inline pgoff_t page_to_index(struct page *page) { pgoff_t pgoff; - if (unlikely(PageHeadHuge(page))) - return page->index << compound_order(page); - if (likely(!PageTransTail(page))) return page->index; @@ -397,6 +394,18 @@ static inline pgoff_t page_to_pgoff(stru } /* + * Get the offset in PAGE_SIZE. + * (TODO: hugepage should have ->index in PAGE_SIZE) + */ +static inline pgoff_t page_to_pgoff(struct page *page) +{ + if (unlikely(PageHeadHuge(page))) + return page->index << compound_order(page); + + return page_to_index(page); +} + +/* * Return byte-offset into filesystem object for page. */ static inline loff_t page_offset(struct page *page) diff -puN mm/truncate.c~mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb mm/truncate.c --- a/mm/truncate.c~mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb +++ a/mm/truncate.c @@ -283,7 +283,7 @@ void truncate_inode_pages_range(struct a if (!trylock_page(page)) continue; - WARN_ON(page_to_pgoff(page) != index); + WARN_ON(page_to_index(page) != index); if (PageWriteback(page)) { unlock_page(page); continue; @@ -371,7 +371,7 @@ void truncate_inode_pages_range(struct a } lock_page(page); - WARN_ON(page_to_pgoff(page) != index); + WARN_ON(page_to_index(page) != index); wait_on_page_writeback(page); truncate_inode_page(mapping, page); unlock_page(page); @@ -492,7 +492,7 @@ unsigned long invalidate_mapping_pages(s if (!trylock_page(page)) continue; - WARN_ON(page_to_pgoff(page) != index); + WARN_ON(page_to_index(page) != index); /* Middle of THP: skip */ if (PageTransTail(page)) { @@ -612,7 +612,7 @@ int invalidate_inode_pages2_range(struct } lock_page(page); - WARN_ON(page_to_pgoff(page) != index); + WARN_ON(page_to_index(page) != index); if (page->mapping != mapping) { unlock_page(page); continue; _ Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are mm-bug-in-munlock_vma_pages_range.patch mm-fix-false-positive-warn_on-in-truncate-invalidate-for-hugetlb.patch filemap-add-comment-for-confusing-logic-in-page_cache_tree_insert.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html