linux-kernel - Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base

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Message-ID: <20150410205205.GU15335@tassilo.jf.intel.com>
Date:	Fri, 10 Apr 2015 13:52:05 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>, X86 ML <x86@...nel.org>,
	Andrew Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base

On Fri, Apr 10, 2015 at 10:25:42PM +0200, Borislav Petkov wrote:
> On Fri, Apr 10, 2015 at 01:21:32PM -0700, Andi Kleen wrote:
> > > Is there some reason that the normal ALTERNATIVE macro can't be used here?
> > 
> > This is assembler, not C.
> 
> He's talking about the ALTERNATIVE asm macro in alternative-asm.h in
> tip/master now. No open coded crap.

I don't think that macro works jumps that are patched in
(and probably should have never been added because of that)

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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