linux-kernel - Re: [PATCH] Use wbinvd() macro instead of raw inline assembly in .c files

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Message-ID: <20070721073231.GG4152@rhun.haifa.ibm.com>
Date:	Sat, 21 Jul 2007 10:32:31 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <ak@...e.de>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Use wbinvd() macro instead of raw inline assembly in .c files

On Fri, Jul 20, 2007 at 10:22:21AM -0700, H. Peter Anvin wrote:

> Andi Kleen wrote:
> > On Friday 20 July 2007 00:55:40 Glauber de Oliveira Costa wrote:
> >> This patch uses the already-existant wbinvd() macro to replace
> >> raw assembly to perform this very same task in some .c files
> >>     
> >> Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
> >>
> >> diff --git a/arch/x86_64/kernel/tce.c b/arch/x86_64/kernel/tce.c
> >> index f61fb8e..afbb951 100644
> >> --- a/arch/x86_64/kernel/tce.c
> >> +++ b/arch/x86_64/kernel/tce.c
> >> @@ -42,7 +42,7 @@ static inline void flush_tce(void* tceaddr)
> >>  	if (cpu_has_clflush)
> >>  		asm volatile("clflush (%0)" :: "r" (tceaddr));
> >>  	else
> >> -		asm volatile("wbinvd":::"memory");
> >> +		wbinvd();
> > 
> > I guess it can be just removed there. I don' think there are any
> > calgary machines without clflush
> > 
> That seems like an unsafe thing to do (unless we err out somewhere);
> lest there is, say, a microcode update disabling clflush due to an
> erratum.

I agree.

Cheers,
Muli
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