ia64: SMP: Remove call to ipi_call_lock_irq()/ipi_call_unlock_irq()

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: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Link: http://lkml.kernel.org/r/1338275765-3217-8-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>

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 1113b8aba07f5a0caa632ff01dc8111899e49185..963d2db53bfa55a9d50932b3301300d3411c3115 100644 (file)
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -382,7 +382,6 @@ smp_callin (void)
        set_numa_node(cpu_to_node_map[cpuid]);
        set_numa_mem(local_memory_node(cpu_to_node_map[cpuid]));
 
-       ipi_call_lock_irq();
        spin_lock(&vector_lock);
        /* Setup the per cpu irq handling data structures */
        __setup_vector_irq(cpuid);
@@ -390,7 +389,6 @@ smp_callin (void)
        set_cpu_online(cpuid, true);
        per_cpu(cpu_state, cpuid) = CPU_ONLINE;
        spin_unlock(&vector_lock);
-       ipi_call_unlock_irq();
 
        smp_setup_percpu_timer();