linux-kernel - Re: [PATCH 6/7] x86, xsave: disable xsave in i387 emulation mode

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Message-ID: <20100726164206.GJ26154@erda.amd.com>
Date:	Mon, 26 Jul 2010 18:42:06 +0200
From:	Robert Richter <robert.richter@....com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] x86, xsave: disable xsave in i387 emulation mode

On 23.07.10 13:50:05, Suresh Siddha wrote:

> Then the more appropriate place for this is to check at the beginning of
> the xsave init code.

No it isn't, HAVE_HWFP is an fpu implementation and the soft fpu check
would be duplicate in xsave.c. Also, the HAVE_HWFP macro is local in
i387.c and would have to be exported in a header file then, which
somehow taints the api.

So I rather tend to this patch than implementing fpu code in xsave for
a small or no benefit.

-Robert

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

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