提交 d58fdd9d 编写于 作者: N Nicholas Piggin 提交者: Michael Ellerman

powerpc/watchdog: Do not backtrace locked CPUs twice if allcpus backtrace is enabled

If sysctl_hardlockup_all_cpu_backtrace is enabled, there is no need to
IPI stuck CPUs for backtrace before trigger_allbutself_cpu_backtrace(),
which does the same thing again.
Signed-off-by: NNicholas Piggin <npiggin@gmail.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
上级 842dc1db
......@@ -133,15 +133,18 @@ static void watchdog_smp_panic(int cpu, u64 tb)
pr_emerg("Watchdog CPU:%d detected Hard LOCKUP other CPUS:%*pbl\n",
cpu, cpumask_pr_args(&wd_smp_cpus_pending));
/*
* Try to trigger the stuck CPUs.
*/
for_each_cpu(c, &wd_smp_cpus_pending) {
if (c == cpu)
continue;
smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000);
if (!sysctl_hardlockup_all_cpu_backtrace) {
/*
* Try to trigger the stuck CPUs, unless we are going to
* get a backtrace on all of them anyway.
*/
for_each_cpu(c, &wd_smp_cpus_pending) {
if (c == cpu)
continue;
smp_send_nmi_ipi(c, wd_lockup_ipi, 1000000);
}
smp_flush_nmi_ipi(1000000);
}
smp_flush_nmi_ipi(1000000);
/* Take the stuck CPUs out of the watch group */
set_cpumask_stuck(&wd_smp_cpus_pending, tb);
......
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