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kernel: clean up USE_GENERIC_SMP_HELPERS

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For arch which needs USE_GENERIC_SMP_HELPERS, it has to select
USE_GENERIC_SMP_HELPERS, rather than leaving a choice to user, since they
don't provide their own implementions.

Also, move on_each_cpu() to kernel/smp.c, it is strange to put it in
kernel/softirq.c.

For arch which doesn't use USE_GENERIC_SMP_HELPERS, e.g.  blackfin, only
on_each_cpu() is compiled.

Signed-off-by: Amerigo Wang <[email protected]>
Cc: David Howells <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Amerigo Wang 2011-01-12 16:59:39 -08:00 • committed by Linus Torvalds
commit 351f8f8e64
5 changed files with 22 additions and 29 deletions
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19
kernel/smp.c
View file

@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
static struct {
struct list_head queue;
raw_spinlock_t lock;
@ -529,3 +530,21 @@ void ipi_call_unlock_irq(void)
{
raw_spin_unlock_irq(&call_function.lock);
}
#endif /* USE_GENERIC_SMP_HELPERS */
/*
* Call a function on all processors
*/
int on_each_cpu(void (*func) (void *info), void *info, int wait)
{
int ret = 0;
preempt_disable();
ret = smp_call_function(func, info, wait);
local_irq_disable();
func(info);
local_irq_enable();
preempt_enable();
return ret;
}
EXPORT_SYMBOL(on_each_cpu);