[PATCH] Define __raw_get_cpu_var and use it

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@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This commit is contained in:

Paul Mackerras

2006-06-25 05:47:14 -07:00

committed by

Linus Torvalds

parent 6ceab8a936

commit bfe5d83419

11 changed files with 19 additions and 7 deletions

									
										kernel/timer.c
									
		+1
		-1
	
												View File
												
				@@ -146,7 +146,7 @@ static void internal_add_timer(tvec_base_t *base, struct timer_list *timer)

				void fastcall init_timer(struct timer_list *timer)

				{

					timer->entry.next = NULL;

					timer->base = per_cpu(tvec_bases, raw_smp_processor_id());

					timer->base = __raw_get_cpu_var(tvec_bases);

				}

				EXPORT_SYMBOL(init_timer);