linux-kernel - Re: [PATCH 0/8] THP support for Sparc64

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Date:	Thu, 04 Oct 2012 14:11:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	aarcange@...hat.com
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, hannes@...xchg.org,
	gerald.schaefer@...ibm.com
Subject: Re: [PATCH 0/8] THP support for Sparc64

From: Andrea Arcangeli <aarcange@...hat.com>
Date: Thu, 4 Oct 2012 12:35:48 +0200

> Hi Dave,
> 
> On Wed, Oct 03, 2012 at 10:00:27PM -0400, David Miller wrote:
>> From: Andrew Morton <akpm@...ux-foundation.org>
>> Date: Tue, 2 Oct 2012 15:55:44 -0700
>> 
>> > I had a shot at integrating all this onto the pending stuff in linux-next. 
>> > "mm: Add and use update_mmu_cache_pmd() in transparent huge page code."
>> > needed minor massaging in huge_memory.c.  But as Andrea mentioned, we
>> > ran aground on Gerald's
>> > http://ozlabs.org/~akpm/mmotm/broken-out/thp-remove-assumptions-on-pgtable_t-type.patch,
>> > part of the thp-for-s390 work.
>> 
>> While working on a rebase relative to this work, I noticed that the
>> s390 patches don't even compile.
>> 
>> It's because of that pmd_pgprot() change from Peter Z. which arrives
>> asynchonously via the linux-next tree.  It makes THP start using
>> pmd_pgprot() (a new interface) which the s390 patches don't provide.
> 
> My suggestion would be to ignore linux-next and port it to -mm only
> and re-send to Andrew. schednuma is by mistake in linux-next, and
> it's not going to get merged as far as I can tell.

Sorry Andrea, that simply is impractical.

The first thing Andrew's patch series does is include linux-next,
therefore every THP and MM patch in his series is against linux-next.

So there are already dependencies in there on the pmd_pgprot() bits
and I already did the implementation for sparc64 so that's what I'm
submitting against.
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