linux-kernel - Re: [PATCH v2] mm/hugetlb: add more arch-defined huge

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Date:	Fri, 15 Mar 2013 18:05:21 +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 v2] mm/hugetlb: add more arch-defined huge_pte functions

On Fri, 15 Mar 2013 17:02:41 +0100
Michal Hocko <mhocko@...e.cz> wrote:

> On Thu 14-03-13 18:51:03, 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
> > generic implementation in asm-generic/hugetlb.h, which will now be
> > included on all architectures supporting hugetlbfs apart from s390.
> > This change will be a no-op for those architectures.
> > 
> > Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
> 
> yes this looks much better. I cannot talk about s390 part because I am
> not familiar with it but the rest looks good to me.
> 
> Maybe one nit, though. pte_page and pte_same do not have their
> huge_Foo counterparts.

Yes, a few pte_xxx calls remain. I left those because they still
work on s390 (and all other archs apparently). I am thinking about
a more complete cleanup, maybe eliminating the ambiguous use of pte_t
for hugetlb completely. Not sure if I can get to it before Martin
introduces the next s390 pte changes :)

Thanks,
Gerald

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