linux-kernel - Re: [PATCH 1/1] mm/hugetlb: add more arch-defined huge_pte

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Message-ID: <20130314151109.5b6927ce@thinkpad>
Date:	Thu, 14 Mar 2013 15:11:09 +0100
From:	Gerald Schaefer <gerald.schaefer@...ibm.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Hillf Danton <dhillf@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 1/1] mm/hugetlb: add more arch-defined huge_pte_xxx
 functions

On Thu, 14 Mar 2013 14:14:04 +0100
Michal Hocko <mhocko@...e.cz> wrote:

> On Tue 12-03-13 19:48:26, Gerald Schaefer wrote:
> > Commit abf09bed3c "s390/mm: implement software dirty bits" introduced
> > another difference in the pte layout vs. the pmd layout on s390,
> > thoroughly breaking the s390 support for hugetlbfs. This requires
> > replacing some more pte_xxx functions in mm/hugetlbfs.c with a
> > huge_pte_xxx version.
> > 
> > This patch introduces those huge_pte_xxx functions and their
> > implementation on all architectures supporting hugetlbfs. This change
> > will be a no-op for all architectures other than s390.
> > 
> > Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
> > ---
> >  arch/ia64/include/asm/hugetlb.h    | 36 ++++++++++++++++++++++++
> >  arch/mips/include/asm/hugetlb.h    | 36 ++++++++++++++++++++++++
> >  arch/powerpc/include/asm/hugetlb.h | 36 ++++++++++++++++++++++++
> >  arch/s390/include/asm/hugetlb.h    | 56 +++++++++++++++++++++++++++++++++++++-
> >  arch/s390/include/asm/pgtable.h    | 20 --------------
> >  arch/s390/mm/hugetlbpage.c         |  2 +-
> >  arch/sh/include/asm/hugetlb.h      | 36 ++++++++++++++++++++++++
> >  arch/sparc/include/asm/hugetlb.h   | 36 ++++++++++++++++++++++++
> >  arch/tile/include/asm/hugetlb.h    | 36 ++++++++++++++++++++++++
> >  arch/x86/include/asm/hugetlb.h     | 36 ++++++++++++++++++++++++
> >  mm/hugetlb.c                       | 23 ++++++++--------
> >  11 files changed, 320 insertions(+), 33 deletions(-)
> 
> Ouch, this adds a lot of code that is almost same for all archs except
> for some. Can we just make one common definition and define only those
> that differ, please?
> [...]

Ok, seems like I misinterpreted the ugliness of HAVE_ARCH_xxx vs. code
duplication. Paul Mundt also suggested going for an asm-generic/hugetlb.h
approach. I'll send a new patch soon.

Thanks,
Gerald

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