linux-kernel - Re: x86/mm/pageattr: Code without effect?

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Message-ID: <20130406154751.GB3612@pd.tnic>
Date:	Sat, 6 Apr 2013 17:47:51 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Stefan Bader <stefan.bader@...onical.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andy Whitcroft <apw@...onical.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: x86/mm/pageattr: Code without effect?

On Sat, Apr 06, 2013 at 04:58:04PM +0200, Andrea Arcangeli wrote:
> You're right, so this location clearly didn't trigger the problem so I
> didn't notice the noop here. I only exercised the fix in the other
> locations of the file that had the same problem.
> 
> It was a noop, so it really couldn't hurt but the below change should
> activate the fix there too. On the same lines, there was a superfluous
> initialization of new_prot too which I cleaned up.
> 
> ==
> From 75598be1156ced0c210271e8958a5c5714a2626a Mon Sep 17 00:00:00 2001
> From: Andrea Arcangeli <aarcange@...hat.com>
> Date: Fri, 5 Apr 2013 19:43:20 +0200
> Subject: [PATCH] mm: pageattr: convert noop to functional fix
> 
> commit a8aed3e0752b4beb2e37cbed6df69faae88268da introduced some valid
> fix but one location that didn't trigger the bug that lead to finding
> those (small) problems, wasn't updated using the right variable.
> 
> The wrong variable was also initialized for no good reason, that may
> have been the source of the confusion. Remove the noop initialization
> accordingly.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>

Yeah, looks good to me. I've folded it into my pile of changes touching
this and there are no visible issues. I mean, if there were, we
should've noticed it exploding elsewhere by now. Also, you might want to
credit Stefan in the commit message for spotting this.

Acked-by: Borislav Petkov <bp@...e.de>

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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