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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 /include
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 'include')
-rw-r--r--include/linux/smp.h23
1 files changed, 9 insertions, 14 deletions
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 44153fdf73f..d699a16b0cb 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -52,23 +52,12 @@ extern void smp_cpus_done(unsigned int max_cpus);
/*
* Call a function on all other processors
*/
-extern int smp_call_function (void (*func) (void *info), void *info,
- int retry, int wait);
+int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
/*
* Call a function on all processors
*/
-static inline 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);
- func(info);
- preempt_enable();
- return ret;
-}
+int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
#define MSG_ALL 0x8001
@@ -94,7 +83,13 @@ void smp_prepare_boot_cpu(void);
#define raw_smp_processor_id() 0
#define hard_smp_processor_id() 0
#define smp_call_function(func,info,retry,wait) ({ 0; })
-#define on_each_cpu(func,info,retry,wait) ({ func(info); 0; })
+#define on_each_cpu(func,info,retry,wait) \
+ ({ \
+ local_irq_disable(); \
+ func(info); \
+ local_irq_enable(); \
+ 0; \
+ })
static inline void smp_send_reschedule(int cpu) { }
#define num_booting_cpus() 1
#define smp_prepare_boot_cpu() do {} while (0)