linux-kernel - [PATCH RFC 0/2] x86/fpu: avoid "xstate_fault" in xsave_user/xrestore

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Message-ID: <20150315164948.GA28149@redhat.com>
Date:	Sun, 15 Mar 2015 17:49:48 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Dave Hansen <dave.hansen@...el.com>, Borislav Petkov <bp@...e.de>,
	Ingo Molnar <mingo@...nel.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Riikonen <priikone@....fi>,
	Rik van Riel <riel@...hat.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Quentin Casasnovas <quentin.casasnovas@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH RFC 0/2] x86/fpu: avoid "xstate_fault" in
	xsave_user/xrestore_user

Hello.

Another a bit off-topic change, but I'd like to finish the discussion
with Quentin.

And almost cosmetic. But I added the RFC tag to make it clear that this
needs a review from someone who understands gcc-asm better. In particular
I am worried if that dummy "=m" (*buf) is actually correct.

And I agree with Quentin, user_insn/check_insn can be improved to allow
clobbers, more flexible "output", etc. But imo they already can make this
code look a bit better, and "xstate_fault" must die eventually.

Quentin, could you review? I can't find your last email about this change,
and I can't recall if you agree or not.

Oleg.

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