netdev - Re: [PATCH] mm: kill kmemcheck

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Message-ID: <20150311102636.6b4110a8@gandalf.local.home>
Date:	Wed, 11 Mar 2015 10:26:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	LKML <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 Wed, 11 Mar 2015 09:39:33 -0400
Sasha Levin <sasha.levin@...cle.com> wrote:

> 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?

Yes for both :-)

> 
> There's no real hurry to kill kmemcheck right now, but we do want to stop
> supporting that in favour of KASan.

Understood, but the kernel is suppose to support older compilers.
Perhaps we can keep kmemcheck for now and say it's obsoleted if you
have a newer compiler. Because it will be a while before I upgrade my
compilers. I don't upgrade unless I have a good reason to do so. Not
sure KASan fulfills that requirement.

-- Steve

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