linux-kernel - Re: [PATCH v2 3/3] i387: support lazy restore of FPU state

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Message-ID: <4F440945.1020904@zytor.com>
Date:	Tue, 21 Feb 2012 13:14:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Josh Boyer <jwboyer@...il.com>,
	Jongman Heo <jongman.heo@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] i387: support lazy restore of FPU state

On 02/21/2012 10:26 AM, Linus Torvalds wrote:
> 
> Yes, but I'll send you this with a proper commit log. I'll also send
> you another patch that splits "<asm/i387.h>" into two.
> 
> Right now <asm/i387.h> has two different users: the first of which
> "normal kernel use" kind of things (ie kernel_fpu_begin() and friends)
> that really don't care about the internals very deeply. But the second
> class of user is the actual i387 internal implementation thing that is
> used by i387.c and xsave.c etc to actually implement the exposed
> interfaces.
> 
> As a result, <asm/i387.h> is this mixture of exposed interfaces and
> "deep internal knowledge". And as a result, that deep internal
> knowledge kind of accidentally gets exposed to code that really
> shouldn't be exposed to it.
> 
> I have a patch that fixes that. I'll send you a series of two patches
> with sign-offs and commentary asap.
> 

Thanks!

	-hpa

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