i386: 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>
diff --git a/arch/i386/kernel/smpcommon.c b/arch/i386/kernel/smpcommon.c
index 1868ae1..bbfe85a 100644
--- a/arch/i386/kernel/smpcommon.c
+++ b/arch/i386/kernel/smpcommon.c
@@ -47,7 +47,7 @@
EXPORT_SYMBOL(smp_call_function);
/**
- * smp_call_function_single - Run a function on another CPU
+ * smp_call_function_single - Run a function on a specific CPU
* @cpu: The target CPU. Cannot be the calling CPU.
* @func: The function to run. This must be fast and non-blocking.
* @info: An arbitrary pointer to pass to the function.
@@ -66,9 +66,11 @@
int ret;
int me = get_cpu();
if (cpu == me) {
- WARN_ON(1);
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
put_cpu();
- return -EBUSY;
+ return 0;
}
ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait);