linux-kernel - Re: [PATCH 2/7] x86, xsave: introduce xstate enable functions

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Message-ID: <20100722131621.GY26154@erda.amd.com>
Date:	Thu, 22 Jul 2010 15:16:21 +0200
From:	Robert Richter <robert.richter@....com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] x86, xsave: introduce xstate enable functions

On 22.07.10 08:23:56, H. Peter Anvin wrote:
> On 07/22/2010 05:15 AM, Robert Richter wrote:
> > 
> > Just wondering why you are using this_func()? Instead, you could
> > simply do:
> > 
> > 	next_func();
> > 	next_func = xstate_enable;
> > 
> > Do you see races when bringing up multiple cpus in parallel?
> > 
> 
> It allows the compiler to turn it into a tailcall if frame pointers are
> disabled.

Yes, that makes sense.

Thanks.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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