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hwtracing/coresight-etm4x: Use cpuhp_setup_state_nocalls_cpuslocked()

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etm_probe4() holds get_online_cpus() while invoking
cpuhp_setup_state_nocalls().

cpuhp_setup_state_nocalls() invokes get_online_cpus() as well. This is
correct, but prevents the conversion of the hotplug locking to a percpu
rwsem.

Use cpuhp_setup_state_nocalls_cpuslocked() to avoid the nested
call. Convert *_online_cpus() to the new interfaces while at it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170524081547.983493849@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2017-05-24 10:15:23 +02:00 committed by Thomas Gleixner
parent e560c89c8a
commit e9f5d63f84
1 changed files with 10 additions and 10 deletions
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20
drivers/hwtracing/coresight/coresight-etm4x.c
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@ -371,7 +371,7 @@ static void etm4_disable_sysfs(struct coresight_device *csdev)
* after cpu online mask indicates the cpu is offline but before the
* DYING hotplug callback is serviced by the ETM driver.
*/
get_online_cpus();
cpus_read_lock();
spin_lock(&drvdata->spinlock);
/*
@ -381,7 +381,7 @@ static void etm4_disable_sysfs(struct coresight_device *csdev)
smp_call_function_single(drvdata->cpu, etm4_disable_hw, drvdata, 1);
spin_unlock(&drvdata->spinlock);
put_online_cpus();
cpus_read_unlock();
dev_info(drvdata->dev, "ETM tracing disabled\n");
}
@ -982,7 +982,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
drvdata->cpu = pdata ? pdata->cpu : 0;
get_online_cpus();
cpus_read_lock();
etmdrvdata[drvdata->cpu] = drvdata;
if (smp_call_function_single(drvdata->cpu,
@ -990,18 +990,18 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
dev_err(dev, "ETM arch init failed\n");
if (!etm4_count++) {
cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING,
"arm/coresight4:starting",
etm4_starting_cpu, etm4_dying_cpu);
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"arm/coresight4:online",
etm4_online_cpu, NULL);
cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING,
"arm/coresight4:starting",
etm4_starting_cpu, etm4_dying_cpu);
ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
"arm/coresight4:online",
etm4_online_cpu, NULL);
if (ret < 0)
goto err_arch_supported;
hp_online = ret;
}
put_online_cpus();
cpus_read_unlock();
if (etm4_arch_supported(drvdata->arch) == false) {
ret = -EINVAL;