Commit f9025255 authored by Vincent Whitchurch's avatar Vincent Whitchurch Committed by Greg Kroah-Hartman
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watchdog: Mark watchdog touch functions as notrace

commit cb9d7fd5 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 ce4f06dc ("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: ce4f06dc

 ("stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE")
Signed-off-by: default avatarVincent Whitchurch <>
Signed-off-by: default avatarThomas Gleixner <>
Cc: Peter Zijlstra <>

Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 0f9bf062
......@@ -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)
......@@ -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
......@@ -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;
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