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 <[EMAIL PROTECTED]>
>>
>> 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.
It also seems to me we should have a macro for clflush(), especially
since it is "clflush (%0)" :: "r" in a number of places, which really
isn't correct; it should be "clflush %0" : "+m", both to allow
addressing modes to be used and to give gcc a modicum of a hint that
something is going on with a specific memory location.
-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
