Re: [PATCH] Define __raw_get_cpu_var and use it

[Martin Schwidefsky]

On Wed, 2006-05-10 at 13:30 +1000, Paul Mackerras wrote:
> There are several instances of per_cpu(foo, raw_smp_processor_id()),
> which is semantically equivalent to __get_cpu_var(foo) but without the
> warning that smp_processor_id() can give if CONFIG_DEBUG_PREEMPT is
> enabled.  For those architectures with optimized per-cpu
> implementations, namely ia64, powerpc, s390, sparc64 and x86_64,
> per_cpu() turns into more and slower code than __get_cpu_var(), so it
> would be preferable to use __get_cpu_var on those platforms.
> 
> This defines a __raw_get_cpu_var(x) macro which turns into
> per_cpu(x, raw_smp_processor_id()) on architectures that use the
> generic per-cpu implementation, and turns into __get_cpu_var(x) on
> the architectures that have an optimized per-cpu implementation.
>     
> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>

Nice, saves an indirection over __per_cpu_offset[]. And it works :-)

Acked-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/