linux-kernel - Re: [PATCH v11 6/7] ARM: add pmd

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Message-ID: <20140709053837.GC9824@bbox>
Date:	Wed, 9 Jul 2014 14:38:37 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Steve Capper <steve.capper@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Jason Evans <je@...com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v11 6/7] ARM: add pmd_[dirty|mkclean] for THP

Hello Steve,

On Tue, Jul 08, 2014 at 12:37:38PM +0100, Steve Capper wrote:
> On Tue, Jul 08, 2014 at 03:03:43PM +0900, Minchan Kim 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.
> > 
> > This patch adds pmd_dirty and pmd_mkclean for THP page MADV_FREE
> > support.
> > 
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: Steve Capper <steve.capper@...aro.org>
> > Cc: Russell King <linux@....linux.org.uk>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Signed-off-by: Minchan Kim <minchan@...nel.org>
> > ---
> >  arch/arm/include/asm/pgtable-3level.h | 3 +++
> >  arch/arm64/include/asm/pgtable.h      | 2 ++
> >  2 files changed, 5 insertions(+)
> 
> Hi Minchan,
> arch/arm and arch/arm64 are handled separately.
> Could you please split this patch into arm and arm64 versions?
> 

Sure.

> 
> > 
> > diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
> > index 85c60adc8b60..3a7bb8dc7d05 100644
> > --- a/arch/arm/include/asm/pgtable-3level.h
> > +++ b/arch/arm/include/asm/pgtable-3level.h
> > @@ -220,6 +220,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
> >  #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING)
> >  #endif
> >  
> > +#define pmd_dirty	(pmd_val(pmd) & PMD_SECT_DIRTY)
> 
> This macro is missing the parameter definition, and will generate a
> compile errror when CONFIG_ARM_LPAE=y
> 
> For 32-bit ARM with CONFIG_ARM_LPAE=n, we don't have THP support and I noticed
> some compiler errors in mm/madvise.c:
> 
>   CC      mm/madvise.o
> mm/madvise.c: In function ‘madvise_free_pte_range’:
> mm/madvise.c:279:3: error: implicit declaration of function ‘pmdp_get_and_clear’ [-Werror=implicit-function-declaration]
>    orig_pmd = pmdp_get_and_clear(mm, addr, pmd);
>    ^
> mm/madvise.c:285:3: error: implicit declaration of function ‘pmd_mkold’ [-Werror=implicit-function-declaration]
>    orig_pmd = pmd_mkold(orig_pmd);
>    ^
> mm/madvise.c:286:3: error: implicit declaration of function ‘pmd_mkclean’ [-Werror=implicit-function-declaration]
>    orig_pmd = pmd_mkclean(orig_pmd);
>    ^
> mm/madvise.c:288:3: error: implicit declaration of function ‘set_pmd_at’ [-Werror=implicit-function-declaration]
>    set_pmd_at(mm, addr, pmd, orig_pmd);
>    ^
> cc1: some warnings being treated as errors
> make[1]: *** [mm/madvise.o] Error 1
> 

Oops, will fix.

Thanks for the review!

> 
> Cheers,
> -- 
> Steve 
> 
> --
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-- 
Kind regards,
Minchan Kim
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