Subject: Re: [PATCH] mm: kill kmemcheck

From: Sasha Levin <[email-masked]>
Date: Thu, 12 Mar 2015 08:40:22 -0400

On 03/11/2015 11:49 PM, Michael Ellerman wrote:
> On Wed, 2015-03-11 at 07:43 -0400, Sasha Levin wrote:
>> As discussed on LSF/MM, kill kmemcheck.
>>
>> KASan is a replacement that is able to work without the limitation of
>> kmemcheck (single CPU, slow). KASan is already upstream.
>>
>> We are also not aware of any users of kmemcheck (or users who don't consider
>> KASan as a suitable replacement).
> 
> From Documentation/kasan.txt:
> 
>     therefore you will need a certain version of GCC > 4.9.2
> 
> AFAIK gcc 4.9.3 hasn't been released yet. (Or does it mean >= 4.9.2 ?)
> 
> Can we perhaps wait until there is a released version of GCC that supports
> KASan? And maybe then a touch longer so folks can test it works on their
> platforms?

I think this is just an off-by-one in the documentation. The cover letter for
the KASan patchset stated:

	KASAN uses compile-time instrumentation for checking every memory access, therefore you
	will need a fresh GCC >= v4.9.2

Thanks,
Sasha

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