linux-kernel - Re: [PATCH 3/6] x86: Add support for the clwb instruction

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Date:	Thu, 13 Nov 2014 10:47:20 -0700
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"Anvin, H Peter" <h.peter.anvin@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 3/6] x86: Add support for the clwb instruction

On Wed, 2014-11-12 at 15:12 +0100, Borislav Petkov wrote:
> On Wed, Nov 12, 2014 at 01:38:45PM +0000, Anvin, H Peter wrote:
> > No, it doesn't.  x86 requires 3.4+ at a minimum.
> 
> The only test I see is:
> 
> #if GCC_VERSION < 30200
> # error Sorry, your compiler is too old - please upgrade it.
> #endif
> 
> And even if we do require 3.4, the build fails with 4.1+ so...

Ah, dang, you're right.  Okay, I'll figure out how to do this without
using xsaveopt.

Thank you for pointing this out.

- Ross

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