nmi: provide the option to issue an NMI back trace to every cpu but current

[sfrench/cifs-2.6.git] / arch / sparc / kernel / process_64.c

diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index b2988f25e2300e2a03fa2725461ee3a489deccae..027e099861947655bc59583b0f2a715ac1fb10f2 100644 (file)
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -239,7 +239,7 @@ static void __global_reg_poll(struct global_reg_snapshot *gp)
        }
 }
 
-void arch_trigger_all_cpu_backtrace(void)
+void arch_trigger_all_cpu_backtrace(bool include_self)
 {
        struct thread_info *tp = current_thread_info();
        struct pt_regs *regs = get_irq_regs();
@@ -251,16 +251,22 @@ void arch_trigger_all_cpu_backtrace(void)
 
        spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 
-       memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
-
        this_cpu = raw_smp_processor_id();
 
-       __global_reg_self(tp, regs, this_cpu);
+       memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
+
+       if (include_self)
+               __global_reg_self(tp, regs, this_cpu);
 
        smp_fetch_global_regs();
 
        for_each_online_cpu(cpu) {
-               struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
+               struct global_reg_snapshot *gp;
+
+               if (!include_self && cpu == this_cpu)
+                       continue;
+
+               gp = &global_cpu_snapshot[cpu].reg;
 
                __global_reg_poll(gp);
 
@@ -292,7 +298,7 @@ void arch_trigger_all_cpu_backtrace(void)
 
 static void sysrq_handle_globreg(int key)
 {
-       arch_trigger_all_cpu_backtrace();
+       arch_trigger_all_cpu_backtrace(true);
 }
 
 static struct sysrq_key_op sparc_globalreg_op = {