]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
mm: differentiate page_mapped() from page_mapcount() for compound pages
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Sat, 16 Jan 2016 00:53:46 +0000 (16:53 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 16 Jan 2016 01:56:32 +0000 (17:56 -0800)
commite1534ae95004d6a307839a44eed40389d608c935
tree43daec95b0face855da72b54bb75bfbc6a6e49a3
parent53f9263baba69fc1630e3c780c4d11b72643f962
mm: differentiate page_mapped() from page_mapcount() for compound pages

Let's define page_mapped() to be true for compound pages if any
sub-pages of the compound page is mapped (with PMD or PTE).

On other hand page_mapcount() return mapcount for this particular small
page.

This will make cases like page_get_anon_vma() behave correctly once we
allow huge pages to be mapped with PTE.

Most users outside core-mm should use page_mapcount() instead of
page_mapped().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arc/mm/cache.c
arch/arm/mm/flush.c
arch/mips/mm/c-r4k.c
arch/mips/mm/cache.c
arch/mips/mm/init.c
arch/sh/mm/cache-sh4.c
arch/sh/mm/cache.c
arch/xtensa/mm/tlb.c
fs/proc/page.c
include/linux/mm.h
mm/filemap.c