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authorLinus Torvalds <torvalds@linux-foundation.org>2011-01-20 18:30:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-20 18:30:37 -0800
commit2b1caf6ed7b888c95a1909d343799672731651a5 (patch)
tree7ab9a7ae13bc02376bce6267df67f6f2aa9091f1 /kernel/smp.c
parentd551d81d6a720542873f478def60baab6b5df403 (diff)
parentbd924e8cbd4b73ffb7d707a774c04f7e2cae88ed (diff)
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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: smp: Allow on_each_cpu() to be called while early_boot_irqs_disabled status to init/main.c lockdep: Move early boot local IRQ enable/disable status to init/main.c
Diffstat (limited to 'kernel/smp.c')
-rw-r--r--kernel/smp.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 2fe66f7c617a..9910744f0856 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -459,7 +459,7 @@ void smp_call_function_many(const struct cpumask *mask,
* can't happen.
*/
WARN_ON_ONCE(cpu_online(this_cpu) && irqs_disabled()
- && !oops_in_progress);
+ && !oops_in_progress && !early_boot_irqs_disabled);
/* So, what's a CPU they want? Ignoring this one. */
cpu = cpumask_first_and(mask, cpu_online_mask);
@@ -572,17 +572,20 @@ void ipi_call_unlock_irq(void)
#endif /* USE_GENERIC_SMP_HELPERS */
/*
- * Call a function on all processors
+ * Call a function on all processors. May be used during early boot while
+ * early_boot_irqs_disabled is set. Use local_irq_save/restore() instead
+ * of local_irq_disable/enable().
*/
int on_each_cpu(void (*func) (void *info), void *info, int wait)
{
+ unsigned long flags;
int ret = 0;
preempt_disable();
ret = smp_call_function(func, info, wait);
- local_irq_disable();
+ local_irq_save(flags);
func(info);
- local_irq_enable();
+ local_irq_restore(flags);
preempt_enable();
return ret;
}