# Re: \[PATCH v14 5/8\] s390: add pmd\_\[dirty\|mkclean\] for THP

- From: Minchan Kim \<hidden\>
- Date: 2014-08-18 00:06:10 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2014/08/4316037
- Thread: https://ratatoskr.run/linux-mm/2014/08/4314697/t.md

```text
Hello,

On Thu, Aug 14, 2014 at 09:16:14AM +0200, Martin Schwidefsky wrote:
> On Thu, 14 Aug 2014 10:53:29 +0900
> Minchan Kim [ref] 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
> 
> The solution is already there, see git commit 152125b7a882df36.
> You can drop this patch.

Thanks for the heads up. I will drop it in next spin.
> 
> -- 
> blue skies,
>    Martin.
> 
> "Reality continues to ruin my life." - Calvin.
> 
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-- 
Kind regards,
Minchan Kim
```