Re: [PATCHv9 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages

[Jerome Marchand <jmarchan@redhat.com>]

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On 07/20/2015 04:21 PM, Kirill A. Shutemov wrote:
> 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>

> ---
>  arch/arc/mm/cache_arc700.c |  4 ++--
>  arch/arm/mm/flush.c        |  2 +-
>  arch/mips/mm/c-r4k.c       |  3 ++-
>  arch/mips/mm/cache.c       |  2 +-
>  arch/mips/mm/init.c        |  6 +++---
>  arch/sh/mm/cache-sh4.c     |  2 +-
>  arch/sh/mm/cache.c         |  8 ++++----
>  arch/xtensa/mm/tlb.c       |  2 +-
>  fs/proc/page.c             |  4 ++--
>  include/linux/mm.h         | 15 +++++++++++++--
>  mm/filemap.c               |  2 +-
>  11 files changed, 31 insertions(+), 19 deletions(-)
> 



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