From: Yong Zhang Date: Tue, 29 May 2012 07:15:58 +0000 (+0800) Subject: parisc: Smp: remove call to ipi_call_lock()/ipi_call_unlock() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ac4216d6922f90c459d531e051c832dadde3a8f7;p=linux-beck.git parisc: 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 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: James E.J. Bottomley Cc: Helge Deller Cc: linux-parisc@vger.kernel.org Link: http://lkml.kernel.org/r/1338275765-3217-4-git-send-email-yong.zhang0@gmail.com Acked-by: Srivatsa S. Bhat Acked-by: Peter Zijlstra Signed-off-by: Thomas Gleixner --- diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c index a47828d31fe6..6266730efd61 100644 --- a/arch/parisc/kernel/smp.c +++ b/arch/parisc/kernel/smp.c @@ -300,9 +300,7 @@ smp_cpu_init(int cpunum) notify_cpu_starting(cpunum); - ipi_call_lock(); set_cpu_online(cpunum, true); - ipi_call_unlock(); /* Initialise the idle task for this CPU */ atomic_inc(&init_mm.mm_count);