author: Paul E. McKenney <paulmck@kernel.org> 2020-07-08 16:25:43 -0700
committer: Paul E. McKenney <paulmck@kernel.org> 2020-08-24 14:24:25 -0700
commit: 160c7ba34605d9b59ee406a1b4a61b0f942b1ae9
parent: 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
Commit Summary:
Diffstat:
1 file changed, 5 insertions, 1 deletion
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c
index 15ca78e1c7d4..8abe1870dba4 100644
--- a/lib/nmi_backtrace.c
+++ b/lib/nmi_backtrace.c
@@ -85,12 +85,16 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask,
put_cpu();
}
+// Dump stacks even for idle CPUs.
+static bool backtrace_idle;
+module_param(backtrace_idle, bool, 0644);
+
bool nmi_cpu_backtrace(struct pt_regs *regs)
{
int cpu = smp_processor_id();
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
- if (regs && cpu_in_idle(instruction_pointer(regs))) {
+ if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) {
pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n",
cpu, (void *)instruction_pointer(regs));
} else {