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authorPaul Mackerras <paulus@samba.org>2006-06-25 05:47:14 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:01 -0700
commitbfe5d834195b3089b8846577311340376cc0f450 (patch)
tree52470de0fe87ff8372700e3472735cd5c14cee9d /kernel/softlockup.c
parent6ceab8a936c302c0cea2bfe55617c76e2f5746fa (diff)
[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 'kernel/softlockup.c')
-rw-r--r--kernel/softlockup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 14c7faf02909..2c1be1163edc 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -36,7 +36,7 @@ static struct notifier_block panic_block = {
void touch_softlockup_watchdog(void)
{
- per_cpu(touch_timestamp, raw_smp_processor_id()) = jiffies;
+ __raw_get_cpu_var(touch_timestamp) = jiffies;
}
EXPORT_SYMBOL(touch_softlockup_watchdog);

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