linux-kernel - Re: [patch] x86: test case for the RODATA config option

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Message-ID: <20080123064905.5d05509a@laptopd505.fenrus.org>
Date:	Wed, 23 Jan 2008 06:49:05 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: test case for the RODATA config option

On 23 Jan 2008 10:09:58 +0100
Andi Kleen <andi@...stfloor.org> wrote:

> Arjan van de Ven <arjan@...radead.org> writes:
> 
> > This patch adds a test module for the DEBUG_RODATA config
> > option to make sure change_page_attr() did indeed make
> > "const" data read only.
> 
> The only that this does that is not done pretty much equivalently
> by pageattr-test.c (it just checks G instead of W) is testing the
> kernel text mapping on 64bit. On 32bit it is fully redundant I
> believe.

What it does is check if the rodata marking was succesful. That's more than just checking 
change_page_attr() itself, and basically a reasonably self self-check of mark_rodata_const().


> Testing the kernel mapping might be a good idea, but I would
> suggest adding it to pageattr-test.c

where we move the actual test function... I don't really care. Once pageattr-test.c
is merged I have absolutely no problem moving it there if it's the right place...
(one can argue that it should be in or near the mark_rodata_const() function instead
since it tests that one).
Just like the NX test I wrote yesterday (and will post later today) probably wants to live
somewhere close to the NX code.
 
> Yes I'm sure these basic facts will not stop it from being 
> applied anyways; just wanted to point it out for the benefit
> of the list readers.

Please spare me the bitter, undeserved sarcasm; I don't remember doing anything
to you to deserve that.
-- 
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