linux-kernel - RE: [PATCH Bugfix v2 2/4] x86/xsaves: Define and use user_xstate

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Message-ID: <3E5A0FA7E9CA944F9D5414FEC6C712205C8CF9F8@ORSMSX106.amr.corp.intel.com>
Date:	Thu, 23 Apr 2015 00:23:06 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"Hansen, Dave" <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Williamson, Glenn P" <glenn.p.williamson@...el.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH Bugfix v2 2/4] x86/xsaves: Define and use
 user_xstate_size for xstate size in signal context

> From: Hansen, Dave
> Sent: Wednesday, April 22, 2015 5:21 PM
> To: Yu, Fenghua; H. Peter Anvin; Ingo Molnar; Thomas Gleixner; Mallick, Asit
> K; Williamson, Glenn P
> Cc: linux-kernel; x86
> Subject: Re: [PATCH Bugfix v2 2/4] x86/xsaves: Define and use
> user_xstate_size for xstate size in signal context
> 
> On 04/22/2015 05:06 PM, Yu, Fenghua wrote:
> > Xsave->xsave_hdr.xstate_bv is equal to pcntxt_mask (see
> > setup_init_fpu_buf()).
> 
> This is going to be a long thread.  But, let's take it a step at a time.
> 
> Do you agree that this earlier statement is incorrect?

The statement is incorrect. But the code is correct.

Thanks.

-Fenghua