linux-kernel - Re: [rfc][patch] i386: remove comment about barriers

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Date:	Sun, 30 Sep 2007 13:58:55 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [rfc][patch] i386: remove comment about barriers

On Sat, Sep 29, 2007 at 08:16:47PM -0700, Paul E. McKenney wrote:
> On Sat, Sep 29, 2007 at 03:28:48PM +0200, Nick Piggin wrote:
> 
> Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 

Thanks v much for confirming, everyone.


> > Signed-off-by: Nick Piggin <npiggin@...e.de>
> > 
> > ---
> > Index: linux-2.6/include/asm-i386/system.h
> > ===================================================================
> > --- linux-2.6.orig/include/asm-i386/system.h
> > +++ linux-2.6/include/asm-i386/system.h
> > @@ -214,11 +214,6 @@ static inline unsigned long get_limit(un
> >   */
> >   
> > 
> > -/* 
> > - * Actually only lfence would be needed for mb() because all stores done 
> > - * by the kernel should be already ordered. But keep a full barrier for now. 
> > - */
> > -
> >  #define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
> >  #define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
> > 
-
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