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x86_64: Allow smp_call_function_single() to current cpu

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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>
This commit is contained in:
Avi Kivity 2007-07-09 17:11:49 +03:00
parent 38ef6d195f
commit 4055551bbc
1 changed files with 9 additions and 5 deletions
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14
arch/x86_64/kernel/smp.c
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@ -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();
if (cpu == me) {
put_cpu();
return 0;
}
/* 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;
}
spin_lock_bh(&call_lock);
__smp_call_function_single(cpu, func, info, nonatomic, wait);
spin_unlock_bh(&call_lock);