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authorAvi Kivity <avi@qumranet.com>2007-07-09 17:11:49 +0300
committerAvi Kivity <avi@qumranet.com>2007-07-16 12:05:50 +0300
commit4055551bbcb0d0be8c916134b4e9074826e89638 (patch)
tree76ee9808a9803eaf8baabbd1c1ad489fac38d620 /arch/x86_64
parent38ef6d195fb794e61a687ef8f5a37daf6044d576 (diff)
downloadlinux-2.6.34-ux500-4055551bbcb0d0be8c916134b4e9074826e89638.tar.gz
x86_64: Allow smp_call_function_single() to current cpu
This removes the requirement for callers to get_cpu() to check in simple cases. Cc: Andi Kleen <ak@suse.de> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/smp.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c
index 2ff46859162..0694940b2e7 100644
--- a/arch/x86_64/kernel/smp.c
+++ b/arch/x86_64/kernel/smp.c
@@ -357,7 +357,7 @@ __smp_call_function_single(int cpu, void (*func) (void *info), void *info,
}
/*
- * smp_call_function_single - Run a function on another CPU
+ * smp_call_function_single - Run a function on a specific CPU
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
* @nonatomic: Currently unused.
@@ -374,14 +374,18 @@ int smp_call_function_single (int cpu, void (*func) (void *info), void *info,
{
/* prevent preemption and reschedule on another processor */
int me = get_cpu();
+
+ /* Can deadlock when called with interrupts disabled */
+ WARN_ON(irqs_disabled());
+
if (cpu == me) {
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
put_cpu();
return 0;
}
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
-
spin_lock_bh(&call_lock);
__smp_call_function_single(cpu, func, info, nonatomic, wait);
spin_unlock_bh(&call_lock);