linux-kernel - Re: [PATCH] mm: kill kmemcheck

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Message-ID: <55007A9B.4010608@oracle.com>
Date:	Wed, 11 Mar 2015 13:25:47 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	David Miller <davem@...emloft.net>
CC:	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] mm: kill kmemcheck

On 03/11/2015 01:20 PM, David Miller wrote:
> From: Sasha Levin <sasha.levin@...cle.com>
> Date: Wed, 11 Mar 2015 09:39:33 -0400
> 
>> > On 03/11/2015 08:40 AM, Steven Rostedt wrote:
>>> >> On Wed, 11 Mar 2015 08:34:46 -0400
>>> >> Sasha Levin <sasha.levin@...cle.com> wrote:
>>> >> 
>>>>> >>> > Fair enough. We knew there are existing kmemcheck users, but KASan should be
>>>>> >>> > superior both in performance and the scope of bugs it finds. It also shouldn't
>>>>> >>> > impose new limitations beyond requiring gcc 4.9.2+.
>>>>> >>> >
>>> >> Ouch! OK, then I can't use it. I'm currently compiling with gcc 4.6.3.
>>> >> 
>>> >> It will be a while before I upgrade my build farm to something newer.
>> > 
>> > Are you actually compiling new kernels with 4.6.3, or are you using older
>> > kernels as well?
>> > 
>> > There's no real hurry to kill kmemcheck right now, but we do want to stop
>> > supporting that in favour of KASan.
> Is the spectrum of CPU's supported by this GCC feature equal to all of the
> CPU's supported by the kernel right now?
> 
> If not, removing kmemcheck will always be a regression for someone.

You're probably wondering why there are changes to SPARC in that patchset? :)

I don't really know. Both kmemcheck and KASan run only on x86. I've also asked
Vegard, who didn't know either... I guess it got copy-pasted from a different
code.

As far as I know the only regression is requiring newer GCC.


Thanks,
Sasha
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