linux-kernel - Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak

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Message-ID: <20160614193407.1470d998@lxorguk.ukuu.org.uk>
Date:	Tue, 14 Jun 2016 19:34:07 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Dave Hansen <dave.hansen@...ux.intel.com>
Cc:	Lukasz Anaczkowski <lukasz.anaczkowski@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	tglx@...utronix.de, mingo@...hat.com, ak@...ux.intel.com,
	kirill.shutemov@...ux.intel.com, mhocko@...e.com,
	akpm@...ux-foundation.org, hpa@...or.com,
	harish.srinivasappa@...el.com, lukasz.odzioba@...el.com,
	grzegorz.andrejczuk@...el.com, lukasz.daniluk@...el.com
Subject: Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak

On Tue, 14 Jun 2016 10:24:16 -0700
Dave Hansen <dave.hansen@...ux.intel.com> wrote:

> On 06/14/2016 10:01 AM, Lukasz Anaczkowski wrote:
> > v2 (Lukasz Anaczkowski):
> >     () fixed compilation breakage  
> ...
> 
> By unconditionally defining the workaround code, even on kernels where
> there is no chance of ever hitting this bug.  I think that's a pretty
> poor way to do it.
> 
> Can we please stick this in one of the intel.c files, so it's only
> present on CPU_SUP_INTEL builds?

Can we please make it use alternatives or somesuch so that it just goes
away at boot if its not a Knights Landing box ?

Alan