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| author | Paul Mackerras <paulus@samba.org> | 2006-06-25 16:47:14 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 21:01:01 +0400 |
| commit | bfe5d834195b3089b8846577311340376cc0f450 (patch) | |
| tree | 52470de0fe87ff8372700e3472735cd5c14cee9d /include/asm-generic/percpu.h | |
| parent | 6ceab8a936c302c0cea2bfe55617c76e2f5746fa (diff) | |
| download | linux-bfe5d834195b3089b8846577311340376cc0f450.tar.xz | |
[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>
Diffstat (limited to 'include/asm-generic/percpu.h')
| -rw-r--r-- | include/asm-generic/percpu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index c0caf433a7d7..c74521157461 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -14,6 +14,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS]; /* var is in discarded region: offset to particular copy we want */ #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) +#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) /* A macro to avoid #include hell... */ #define percpu_modcopy(pcpudst, src, size) \ @@ -30,6 +31,7 @@ do { \ #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) #define __get_cpu_var(var) per_cpu__##var +#define __raw_get_cpu_var(var) per_cpu__##var #endif /* SMP */ |