[S390] smp/idle: call init_idle() before starting a new cpu
Call init_idle() which (re-)initializes the idle task structure before
it gets used on a new cpu.
That way we can also get rid of the odd preempt_enable_no_resched()
call we have in the cpu offline path within cpu_idle(). That call
prevented preempt count imbalances between cpu hotplug operations.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index b825b3e..c2fffb5 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -42,6 +42,7 @@
#include <asm/irq.h>
#include <asm/timer.h>
#include <asm/nmi.h>
+#include <asm/smp.h>
#include "entry.h"
asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
@@ -76,13 +77,8 @@
*/
static void default_idle(void)
{
- /* CPU is going idle. */
-#ifdef CONFIG_HOTPLUG_CPU
- if (cpu_is_offline(smp_processor_id())) {
- preempt_enable_no_resched();
+ if (cpu_is_offline(smp_processor_id()))
cpu_die();
- }
-#endif
local_irq_disable();
if (need_resched()) {
local_irq_enable();
