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authorVincent Whitchurch <vincent.whitchurch@axis.com>2018-08-21 17:25:07 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-05 09:29:55 +0200
commitf90252556e1aa90e6b9567560829a54488187c16 (patch)
tree3e4aa6e1ed260df3ab54dd97065ca9eeb203be41
parent0f9bf062f1f134dc4087ce321fc9b54319e2006f (diff)
watchdog: Mark watchdog touch functions as notrace
commit cb9d7fd51d9fbb329d182423bd7b92d0f8cb0e01 upstream. Some architectures need to use stop_machine() to patch functions for ftrace, and the assumption is that the stopped CPUs do not make function calls to traceable functions when they are in the stopped state. Commit ce4f06dcbb5d ("stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE") added calls to the watchdog touch functions from the stopped CPUs and those functions lack notrace annotations. This leads to crashes when enabling/disabling ftrace on ARM kernels built with the Thumb-2 instruction set. Fix it by adding the necessary notrace annotations. Fixes: ce4f06dcbb5d ("stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE") Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: oleg@redhat.com Cc: tj@kernel.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180821152507.18313-1-vincent.whitchurch@axis.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/watchdog.c4
-rw-r--r--kernel/watchdog_hld.c2
-rw-r--r--kernel/workqueue.c2
3 files changed, 4 insertions, 4 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 576d18045811..51f5a64d9ec2 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -266,7 +266,7 @@ static void __touch_watchdog(void)
* entering idle state. This should only be used for scheduler events.
* Use touch_softlockup_watchdog() for everything else.
*/
-void touch_softlockup_watchdog_sched(void)
+notrace void touch_softlockup_watchdog_sched(void)
{
/*
* Preemption can be enabled. It doesn't matter which CPU's timestamp
@@ -275,7 +275,7 @@ void touch_softlockup_watchdog_sched(void)
raw_cpu_write(watchdog_touch_ts, 0);
}
-void touch_softlockup_watchdog(void)
+notrace void touch_softlockup_watchdog(void)
{
touch_softlockup_watchdog_sched();
wq_watchdog_touch(raw_smp_processor_id());
diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index e449a23e9d59..4ece6028007a 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -29,7 +29,7 @@ static struct cpumask dead_events_mask;
static unsigned long hardlockup_allcpu_dumped;
static atomic_t watchdog_cpus = ATOMIC_INIT(0);
-void arch_touch_nmi_watchdog(void)
+notrace void arch_touch_nmi_watchdog(void)
{
/*
* Using __raw here because some code paths have
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 78b192071ef7..5f78c6e41796 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5559,7 +5559,7 @@ static void wq_watchdog_timer_fn(struct timer_list *unused)
mod_timer(&wq_watchdog_timer, jiffies + thresh);
}
-void wq_watchdog_touch(int cpu)
+notrace void wq_watchdog_touch(int cpu)
{
if (cpu >= 0)
per_cpu(wq_watchdog_touched_cpu, cpu) = jiffies;