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

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Date:	Tue, 12 Mar 2013 15:00:37 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Gerald Schaefer <gerald.schaefer@...ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Hillf Danton <dhillf@...il.com>, Michal Hocko <mhocko@...e.cz>,
	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>,
	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 3/12/2013 2:48 PM, 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.
>
> [...]
>  
> +static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
> +{
> +	return mk_pte(page, pgprot);
> +}

Does it make sense to merge this new per-arch function with the existing per-arch arch_make_huge_pte() function?  Certainly in the tile case, we could set up our "super" bit in the initial mk_huge_pte() call, and then set "young" and "huge" after that in the platform-independent caller (make_huge_pte).  This would allow your change to eliminate some code as well as just introducing code :-)

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com

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