From e560c89c8ac0baadf0da351f602c599016568fc7 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Wed, 24 May 2017 10:15:22 +0200 Subject: [PATCH] hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked() etm_probe() 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 Signed-off-by: Thomas Gleixner Acked-by: Ingo Molnar Acked-by: Mathieu Poirier Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Steven Rostedt Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20170524081547.889092478@linutronix.de --- drivers/hwtracing/coresight/coresight-etm3x.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index a51b6b6..93ee8fc 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -587,7 +587,7 @@ static void etm_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); /* @@ -597,7 +597,7 @@ static void etm_disable_sysfs(struct coresight_device *csdev) smp_call_function_single(drvdata->cpu, etm_disable_hw, drvdata, 1); spin_unlock(&drvdata->spinlock); - put_online_cpus(); + cpus_read_unlock(); dev_info(drvdata->dev, "ETM tracing disabled\n"); } @@ -795,7 +795,7 @@ static int etm_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, @@ -803,17 +803,17 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) dev_err(dev, "ETM arch init failed\n"); if (!etm_count++) { - cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING, - "arm/coresight:starting", - etm_starting_cpu, etm_dying_cpu); - ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, - "arm/coresight:online", - etm_online_cpu, NULL); + cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, + "arm/coresight:starting", + etm_starting_cpu, etm_dying_cpu); + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, + "arm/coresight:online", + etm_online_cpu, NULL); if (ret < 0) goto err_arch_supported; hp_online = ret; } - put_online_cpus(); + cpus_read_unlock(); if (etm_arch_supported(drvdata->arch) == false) { ret = -EINVAL; -- 2.7.4