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

[Muli Ben-Yehuda <muli@il.ibm.com>]

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@redhat.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