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[PATCH] Define __raw_get_cpu_var and use it

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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 <[email protected]>
Acked-by: David S. Miller <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Paul Mackerras 2006-06-25 05:47:14 -07:00 • committed by Linus Torvalds
commit bfe5d83419
11 changed files with 19 additions and 7 deletions
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4
kernel/sched.c
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@ -4152,7 +4152,7 @@ EXPORT_SYMBOL(yield);
*/
void __sched io_schedule(void)
{
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
struct runqueue *rq = &__raw_get_cpu_var(runqueues);
atomic_inc(&rq->nr_iowait);
schedule();
@ -4163,7 +4163,7 @@ EXPORT_SYMBOL(io_schedule);
long __sched io_schedule_timeout(long timeout)
{
struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id());
struct runqueue *rq = &__raw_get_cpu_var(runqueues);
long ret;
atomic_inc(&rq->nr_iowait);