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authorWilliam Kucharski <william.kucharski@oracle.com>2019-10-18 20:20:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-10-19 06:32:32 -0400
commit906d278d75e364f2bb85dc1e1ff6265ea46e7e43 (patch)
tree0b7cfe5202d6fbf5e0191ac9eeb9fcb3af981351
parent06d3eff62d9dc6f21e7ebeb14399f2542a36cdf5 (diff)
downloadlinux-906d278d75e364f2bb85dc1e1ff6265ea46e7e43.tar.bz2
mm/vmscan.c: support removing arbitrary sized pages from mapping
__remove_mapping() assumes that pages can only be either base pages or HPAGE_PMD_SIZE. Ask the page what size it is. Link: http://lkml.kernel.org/r/20191017164223.2762148-4-songliubraving@fb.com Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by: William Kucharski <william.kucharski@oracle.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Song Liu <songliubraving@fb.com> Acked-by: Yang Shi <yang.shi@linux.alibaba.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmscan.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 024b7e929752..ee4eecc7e1c2 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -933,10 +933,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* Note that if SetPageDirty is always performed via set_page_dirty,
* and thus under the i_pages lock, then this ordering is not required.
*/
- if (unlikely(PageTransHuge(page)) && PageSwapCache(page))
- refcount = 1 + HPAGE_PMD_NR;
- else
- refcount = 2;
+ refcount = 1 + compound_nr(page);
if (!page_ref_freeze(page, refcount))
goto cannot_free;
/* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */