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authorYong Zhang <yong.zhang0@gmail.com>2012-05-29 15:15:59 +0800
committerThomas Gleixner <tglx@linutronix.de>2012-06-05 17:27:12 +0200
commit46ce7fbfdbe0be6aaf0e816331aac08a74a00e5a (patch)
treea6017d310a9c049e3613533c0c45694d93701bba
parentac4216d6922f90c459d531e051c832dadde3a8f7 (diff)
downloadlinux-linaro-stable-46ce7fbfdbe0be6aaf0e816331aac08a74a00e5a.tar.gz
S390: Smp: remove call to ipi_call_lock()/ipi_call_unlock()
ipi_call_lock/unlock() lock resp. unlock call_function.lock. This lock protects only the call_function data structure itself, but it's completely unrelated to cpu_online_mask. The mask to which the IPIs are sent is calculated before call_function.lock is taken in smp_call_function_many(), so the locking around set_cpu_online() is pointless and can be removed. [ tglx: Massaged changelog ] Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Cc: ralf@linux-mips.org Cc: sshtylyov@mvista.com Cc: david.daney@cavium.com Cc: nikunj@linux.vnet.ibm.com Cc: paulmck@linux.vnet.ibm.com Cc: axboe@kernel.dk Cc: peterz@infradead.org Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux390@de.ibm.com Cc: linux-s390@vger.kernel.org Link: http://lkml.kernel.org/r/1338275765-3217-5-git-send-email-yong.zhang0@gmail.com Acked-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--arch/s390/kernel/smp.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 15cca26ccb6c..8dca9c248ac7 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -717,9 +717,7 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
init_cpu_vtimer();
pfault_init();
notify_cpu_starting(smp_processor_id());
- ipi_call_lock();
set_cpu_online(smp_processor_id(), true);
- ipi_call_unlock();
local_irq_enable();
/* cpu_idle will call schedule for us */
cpu_idle();