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Groups > linux.kernel > #1627370

[tip:smp/hotplug] hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked()

From tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com>
Newsgroups linux.kernel
Subject [tip:smp/hotplug] hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked()
Date 2017-04-20 13:30 +0200
Message-ID <tyirF-8jz-41@gated-at.bofh.it> (permalink)
References <txHs7-1Kl-33@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Commit-ID:  c8fbca5abedcbf4212a34b7d3aef9c2adc44d36e
Gitweb:     http://git.kernel.org/tip/c8fbca5abedcbf4212a34b7d3aef9c2adc44d36e
Author:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
AuthorDate: Tue, 18 Apr 2017 19:04:50 +0200
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 20 Apr 2017 13:08:52 +0200

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.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
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/20170418170553.026838125@linutronix.de

---
 drivers/hwtracing/coresight/coresight-etm3x.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index a51b6b6..c9a0a75 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
@@ -803,12 +803,12 @@ 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;

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Thread

[patch V2 00/24] cpu/hotplug: Convert get_online_cpus() to a  percpu_rwsem Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 21:50 +0200
  [patch V2 03/24] padata: Make padata_alloc() static Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 21:50 +0200
    [tip:smp/hotplug] padata: Make padata_alloc() static tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 20/24] perf/core: Remove redundant get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] perf/core: Remove redundant get_online_cpus() tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 22/24] jump_label: Provide static_key_slow_inc_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
  [patch V2 15/24] x86/perf: Drop EXPORT of perf_check_microcode Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] x86/perf: Drop EXPORT of perf_check_microcode tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 09/24] hwtracing/coresight-etm4x: Use  cpuhp_setup_state_nocalls_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] hwtracing/coresight-etm4x: Use  cpuhp_setup_state_nocalls_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 23/24] perf: Avoid cpu_hotplug_lock r-r recursion Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
  [patch V2 16/24] perf/x86/intel: Drop get_online_cpus() in  intel_snb_check_microcode() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] perf/x86/intel: Drop get_online_cpus() in  intel_snb_check_microcode() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 24/24] cpu/hotplug: Convert hotplug locking to percpu rwsem Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] cpu/hotplug: Convert hotplug locking to percpu  rwsem tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 05/24] x86/mtrr: Remove get_online_cpus() from  mtrr_save_state() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] x86/mtrr: Remove get_online_cpus() from  mtrr_save_state() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 14/24] cpu/hotplug: Use stop_machine_cpuslocked() in  takedown_cpu() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] cpu/hotplug: Use stop_machine_cpuslocked() in  takedown_cpu() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 18/24] PCI: Replace the racy recursion prevention Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] PCI: Replace the racy recursion prevention tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 21/24] jump_label: Pull get_online_cpus() into generic code Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
  [patch V2 12/24] s390/kernel: Use stop_machine_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] s390/kernel: Use stop_machine_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 06/24] cpufreq: Use cpuhp_setup_state_nocalls_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] cpufreq: Use  cpuhp_setup_state_nocalls_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 19/24] ACPI/processor: Use cpu_hotplug_disable() instead of  get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] ACPI/processor: Use cpu_hotplug_disable() instead  of get_online_cpus() tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 08/24] hwtracing/coresight-etm3x: Use  cpuhp_setup_state_nocalls_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] hwtracing/coresight-etm3x: Use  cpuhp_setup_state_nocalls_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
    Re: [patch V2 08/24] hwtracing/coresight-etm3x: Use cpuhp_setup_state_nocalls_cpuslocked() Mathieu Poirier <mathieu.poirier@linaro.org> - 2017-04-20 17:20 +0200
    Re: [patch V2 08/24] hwtracing/coresight-etm3x: Use  cpuhp_setup_state_nocalls_cpuslocked() Mathieu Poirier <mathieu.poirier@linaro.org> - 2017-04-20 17:40 +0200
  [patch V2 17/24] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-04-20 13:40 +0200
  [patch V2 13/24] powerpc/powernv: Use stop_machine_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] powerpc/powernv: Use stop_machine_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 11/24] ARM/hw_breakpoint: Use cpuhp_setup_state_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    Re: [patch V2 11/24] ARM/hw_breakpoint: Use  cpuhp_setup_state_cpuslocked() Mark Rutland <mark.rutland@arm.com> - 2017-04-19 20:00 +0200
      Re: [patch V2 11/24] ARM/hw_breakpoint: Use  cpuhp_setup_state_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-19 20:30 +0200
    [tip:smp/hotplug] ARM/hw_breakpoint: Use  cpuhp_setup_state_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 07/24] KVM/PPC/Book3S HV: Use  cpuhp_setup_state_nocalls_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] KVM/PPC/Book3S HV: Use  cpuhp_setup_state_nocalls_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200
  [patch V2 10/24] perf/x86/intel/cqm: Use  cpuhp_setup_state_cpuslocked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [tip:smp/hotplug] perf/x86/intel/cqm: Use  cpuhp_setup_state_cpuslocked() tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2017-04-20 13:30 +0200

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