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| author | Paul Mackerras <paulus@samba.org> | 2006-06-25 05:47:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 10:01:01 -0700 |
| commit | bfe5d834195b3089b8846577311340376cc0f450 (patch) | |
| tree | 52470de0fe87ff8372700e3472735cd5c14cee9d /kernel/softlockup.c | |
| parent | 6ceab8a936c302c0cea2bfe55617c76e2f5746fa (diff) | |
| download | lwn-bfe5d834195b3089b8846577311340376cc0f450.tar.gz lwn-bfe5d834195b3089b8846577311340376cc0f450.zip | |
[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.c | 2 |
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); |