Re: [PATCH v10 5/7] s390: add pmd_[dirty|mkclean] for THP

[Gerald Schaefer]

On Mon,  7 Jul 2014 09:53:56 +0900
Minchan Kim <minchan@xxxxxxxxxx> wrote:

> MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent
> overwrite of the contents since MADV_FREE syscall is called for
> THP page but for s390 pmds only referenced bit is available
> because there is no free bit left in the pmd entry for the
> software dirty bit so this patch adds dumb pmd_dirty which
> returns always true by suggesting by Martin.
> 
> They finally find a solution in future.
> http://marc.info/?l=linux-api&m=140440328820808&w=2
> 
> Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
> Cc: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Cc: linux-s390@xxxxxxxxxxxxxxx
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
> ---
>  arch/s390/include/asm/pgtable.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)

Acked-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>

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