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>

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index c8e0670..087994b 100644 (file)
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -265,7 +265,7 @@ 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
@@ -274,7 +274,7 @@ 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 e449a23..4ece602 100644 (file)
--- 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 d8a7f89..08bc551 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5484,7 +5484,7 @@ static void wq_watchdog_timer_fn(unsigned long data)
        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;