From: Aaron Tomlin <atomlin@xxxxxxxxxx>
This patch introduces the sparc specific implementation
changes to the arch_trigger_all_cpu_backtrace() routine.
Now users have the ability to choose whether or not to
issue an NMI back trace which includes current.
Update sysrq_handle_globreg() to use the new interface
[squash two sparc patches, update changelog - dcz]
Signed-off-by: Aaron Tomlin <atomlin@xxxxxxxxxx>
Signed-off-by: Don Zickus <dzickus@xxxxxxxxxx>
---
arch/sparc/include/asm/irq_64.h | 2 +-
arch/sparc/kernel/process_64.c | 14 +++++++++-----
2 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/sparc/include/asm/irq_64.h b/arch/sparc/include/asm/irq_64.h
index abf6afe..4f072b9 100644
--- a/arch/sparc/include/asm/irq_64.h
+++ b/arch/sparc/include/asm/irq_64.h
@@ -89,7 +89,7 @@ static inline unsigned long get_softint(void)
return retval;
}
-void arch_trigger_all_cpu_backtrace(void);
+void arch_trigger_all_cpu_backtrace(bool);
#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
extern void *hardirq_stack[NR_CPUS];
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 32a280e..3d61b98 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -237,7 +237,7 @@ 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();
@@ -249,15 +249,19 @@ 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) {
+ if (!include_self && cpu == this_cpu)
+ continue;
+
struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
__global_reg_poll(gp);
@@ -290,7 +294,7 @@ 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 = {
--
1.7.1
--
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