linux-kernel - Re: [PATCH 0/4] Fix vmalloc regression

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Message-ID: <20081108005832.GA2068@wotan.suse.de>
Date:	Sat, 8 Nov 2008 01:58:32 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Glauber Costa <glommer@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, avi@...hat.com
Subject: Re: [PATCH 0/4] Fix vmalloc regression

On Fri, Nov 07, 2008 at 08:35:50PM -0200, Glauber Costa wrote:
> Nick,
> 
> This is the whole set of patches I was talking about.
> Patch 3 is the one that in fact fixes the problem
> Patches 1 and 2 are debugging aids I made use of, and could be possibly
> useful to others
> Patch 4 removes guard pages entirely for non-debug kernels, as we have already
> previously discussed.
> 
> Hope it's all fine.

OK, these all look good, but I may only push 3/4 for Linus in this round,
along with some of the changes from my patch that you tested as well.

With the DEBUG_PAGEALLOC case, I have been thinking that we perhaps should
turn off the lazy unmapping optimisation as well, so it catches use
after free similarly to the page allocator... but probably it is a good
idea at least to avoid the double-guard page for 2.6.28?

Anyway thanks for these, I'll send them up to Andrew/Linus and cc you.

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