Date: Thu, 1 Nov 2012 10:49:45 +0000
From: Mel Gorman <mgorman@suse.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rik van Riel <riel@redhat.com>, Andrea Arcangeli <aarcange@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Gerald Schaefer <gerald.schaefer@de.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ralf Baechle <ralf@linux-mips.org>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH 07/31] sched, numa, mm, s390/thp: Implement pmd_pgprot()
 for s390
Message-ID: <20121101104945.GQ3888@suse.de>
References: <20121025121617.617683848@chello.nl>
 <20121025124832.996734608@chello.nl>
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On Thu, Oct 25, 2012 at 02:16:24PM +0200, Peter Zijlstra wrote:
> From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
> 
> This patch adds an implementation of pmd_pgprot() for s390,
> in preparation to future THP changes.
> 

The additional pmd_pgprot implementations only are necessary if we want
to preserve the PROT_NONE protections across a split but that somewhat
forces that PROT_NONE be used as the protection bit across all
architectures. Is that possible? I think I would prefer that
prot-protection-across-splits just went away until it was proven
necessary and potentially recoded in terms of _PAGE_NUMA and friends
instead.

-- 
Mel Gorman
SUSE Labs
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