linux-kernel - Re: [patch 7/7] powerpc: lockless get_user_pages

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Message-ID: <Pine.LNX.4.64.0806102138380.19967@schroedinger.engr.sgi.com>
Date:	Tue, 10 Jun 2008 21:40:25 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, paulus@...ba.org
Subject: Re: [patch 7/7] powerpc: lockless get_user_pages_fast

On Wed, 11 Jun 2008, Nick Piggin wrote:

> > This is reversing the modification to make get_page_unless_zero() usable 
> > with compound page heads. Will break the slab defrag patchset.
> 
> Is the slab defrag patchset in -mm? Because you ignored my comment about
> this change that assertions should not be weakened until required by the
> actual patchset. I wanted to have these assertions be as strong as
> possible for the lockless pagecache patchset.

So you are worried about accidentally using get_page_unless_zero on a 
compound page? What would be wrong about that?



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