From: Kenji Kaneshige <[email protected]>
---
Fixing the confliction between CPU hot-add and IPI.
Signed-off-by: Kenji Kaneshige <[email protected]>
Acked-by: Satoru Takeuchi <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Index: linux-2.6.19-rc3/arch/ia64/kernel/smp.c
===================================================================
--- linux-2.6.19-rc3.orig/arch/ia64/kernel/smp.c 2006-10-27 18:40:47.000000000 +0900
+++ linux-2.6.19-rc3/arch/ia64/kernel/smp.c 2006-10-27 18:49:48.000000000 +0900
@@ -328,10 +328,14 @@
smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait)
{
struct call_data_struct data;
- int cpus = num_online_cpus()-1;
+ int cpus;
- if (!cpus)
+ spin_lock(&call_lock);
+ cpus = num_online_cpus() - 1;
+ if (!cpus) {
+ spin_unlock(&call_lock);
return 0;
+ }
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
@@ -343,8 +347,6 @@
if (wait)
atomic_set(&data.finished, 0);
- spin_lock(&call_lock);
-
call_data = &data;
mb(); /* ensure store to call_data precedes setting of IPI_CALL_FUNC */
send_IPI_allbutself(IPI_CALL_FUNC);
-
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