[patch 2/4] s390: fix preempt_count of idle thread with cpu hotplug

[Heiko Carstens]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

Set preempt_count of idle_thread to zero before switching off cpu.
Otherwise the preempt_count will be wrong if the cpu is switched on again
since the thread will be reused.

Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---

Looks to me like at least powerpc seems to have the same problem.

 arch/s390/kernel/process.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -urpN linux-2.6/arch/s390/kernel/process.c linux-2.6-patched/arch/s390/kernel/process.c
--- linux-2.6/arch/s390/kernel/process.c	2006-02-16 07:29:46.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/process.c	2006-02-16 07:30:06.000000000 +0100
@@ -128,8 +128,10 @@ void default_idle(void)
 	__ctl_set_bit(8, 15);
 
 #ifdef CONFIG_HOTPLUG_CPU
-	if (cpu_is_offline(cpu))
+	if (cpu_is_offline(cpu)) {
+		preempt_enable_no_resched();
 		cpu_die();
+	}
 #endif
 
 	local_mcck_disable();
-
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