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authorAndrew Morton <akpm@osdl.org>2006-03-22 00:08:16 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:53:59 -0800
commit78eef01b0fae087c5fadbd85dd4fe2918c3a015f (patch)
tree78057039596aa733ff904a36260cca3a51af6981 /kernel/softirq.c
parentac2b898ca6fb06196a26869c23b66afe7944e52e (diff)
[PATCH] on_each_cpu(): disable local interrupts
When on_each_cpu() runs the callback on other CPUs, it runs with local interrupts disabled. So we should run the function with local interrupts disabled on this CPU, too. And do the same for UP, so the callback is run in the same environment on both UP and SMP. (strictly it should do preempt_disable() too, but I think local_irq_disable is sufficiently equivalent). Also uninlines on_each_cpu(). softirq.c was the most appropriate file I could find, but it doesn't seem to justify creating a new file. Oh, and fix up that comment over (under?) x86's smp_call_function(). It drives me nuts. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/softirq.c')
-rw-r--r--kernel/softirq.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index ad3295cdded5..ec8fed42a86f 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -16,6 +16,7 @@
#include <linux/cpu.h>
#include <linux/kthread.h>
#include <linux/rcupdate.h>
+#include <linux/smp.h>
#include <asm/irq.h>
/*
@@ -495,3 +496,22 @@ __init int spawn_ksoftirqd(void)
register_cpu_notifier(&cpu_nfb);
return 0;
}
+
+#ifdef CONFIG_SMP
+/*
+ * Call a function on all processors
+ */
+int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait)
+{
+ int ret = 0;
+
+ preempt_disable();
+ ret = smp_call_function(func, info, retry, wait);
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
+ preempt_enable();
+ return ret;
+}
+EXPORT_SYMBOL(on_each_cpu);
+#endif

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