Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Prevent sparc64 from invoking irq handlers on offline CPUs
  sparc64: Fix IPI call locking.

1 files changed, 6 insertions, 8 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 743ccad61c60..2be166c544ca 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -80,8 +80,6 @@ void smp_bogo(struct seq_file *m)
                            i, cpu_data(i).clock_tick);
 }
 
-static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
-
 extern void setup_sparc64_timer(void);
 
 static volatile unsigned long callin_flag = 0;
@@ -120,9 +118,9 @@ void __cpuinit smp_callin(void)
         while (!cpu_isset(cpuid, smp_commenced_mask))
                 rmb();
 
-        spin_lock(&call_lock);
+        ipi_call_lock();
         cpu_set(cpuid, cpu_online_map);
-        spin_unlock(&call_lock);
+        ipi_call_unlock();
 
         /* idle thread is expected to have preempt disabled */
         preempt_disable();
@@ -1305,10 +1303,6 @@ int __cpu_disable(void)
         c->core_id = 0;
         c->proc_id = -1;
 
-        spin_lock(&call_lock);
-        cpu_clear(cpu, cpu_online_map);
-        spin_unlock(&call_lock);
-
         smp_wmb();
 
         /* Make sure no interrupts point to this cpu.  */
@@ -1318,6 +1312,10 @@ int __cpu_disable(void)
         mdelay(1);
         local_irq_disable();
 
+        ipi_call_lock();
+        cpu_clear(cpu, cpu_online_map);
+        ipi_call_unlock();
+
         return 0;
 }