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Groups > linux.kernel > #1624102 > unrolled thread

[patch 00/20] cpu/hotplug: Convert get_online_cpus() to a percpu_rwsem

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  [patch 00/20] cpu/hotplug: Convert get_online_cpus() to a percpu_rwsem Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 02/20] stop_machine: Provide stop_machine_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 20/20] cpu/hotplug: Convert hotplug locking to percpu rwsem Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
      Re: [patch 20/20] cpu/hotplug: Convert hotplug locking to percpu  rwsem Peter Zijlstra <peterz@infradead.org> - 2017-04-17 09:00 +0200
    [patch 17/20] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
      Re: [patch 17/20] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Peter Zijlstra <peterz@infradead.org> - 2017-04-17 08:50 +0200
        Re: [patch 17/20] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-17 09:50 +0200
      Re: [patch 17/20] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Bjorn Helgaas <helgaas@kernel.org> - 2017-04-18 21:50 +0200
        Re: [patch 17/20] PCI: Use cpu_hotplug_disable() instead of  get_online_cpus() Thomas Gleixner <tglx@linutronix.de> - 2017-04-18 22:00 +0200
    [patch 12/20] s390/kernel: Use stop_machine_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 13/20] powerpc/powernv: Use stop_machine_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 03/20] padata: Make padata_alloc() static Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
      Re: [patch 03/20] padata: Make padata_alloc() static "Jason A. Donenfeld" <Jason@zx2c4.com> - 2017-04-16 08:30 +0200
        Re: [patch 03/20] padata: Make padata_alloc() static Thomas Gleixner <tglx@linutronix.de> - 2017-04-17 11:20 +0200
    [patch 01/20] cpu/hotplug: Provide  cpuhp_setup/remove_state[_nocalls]_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 18/20] PCI: Replace the racy recursion prevention Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 04/20] padata: Avoid nested calls to get_online_cpus() in  pcrypt_init_padata() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 14/20] kernel/hotplug: Use stop_machine_locked() in  takedown_cpu() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 05/20] x86/mtrr: Remove get_online_cpus() from  mtrr_save_state() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 07/20] KVM/PPC/Book3S HV: Use  cpuhp_setup_state_nocalls_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 16/20] perf/x86/intel: Drop get_online_cpus() in  intel_snb_check_microcode() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
      Re: [patch 16/20] perf/x86/intel: Drop get_online_cpus() in  intel_snb_check_microcode() Borislav Petkov <bp@alien8.de> - 2017-04-18 13:30 +0200
    [patch 09/20] hwtracing/coresight-etm4x: Use  cpuhp_setup_state_nocalls_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 10/20] perf/x86/intel/cqm: Use cpuhp_setup_state_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
      Re: [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked() "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-16 01:00 +0200
      Re: [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked() Viresh Kumar <viresh.kumar@linaro.org> - 2017-04-17 06:20 +0200
    [patch 08/20] hwtracing/coresight-etm3x: Use the locked version of  cpuhp_setup_state_nocalls() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200
    [patch 11/20] ARM/hw_breakpoint: Use cpuhp_setup_state_locked() Thomas Gleixner <tglx@linutronix.de> - 2017-04-15 19:40 +0200

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#1624115 — [patch 16/20] perf/x86/intel: Drop get_online_cpus() in intel_snb_check_microcode()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

If intel_snb_check_microcode() is invoked via
  microcode_init -> perf_check_microcode -> intel_snb_check_microcode

then get_online_cpus() is invoked nested. This works with the current
implementation of get_online_cpus() but prevents converting it to a percpu
rwsem.

intel_snb_check_microcode() is also invoked from intel_sandybridge_quirk()
unprotected.

Drop get_online_cpus() from intel_snb_check_microcode() and add it to
intel_sandybridge_quirk() so both call sites are protected.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org

---
 arch/x86/events/intel/core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3389,12 +3389,10 @@ static void intel_snb_check_microcode(vo
 	int pebs_broken = 0;
 	int cpu;
 
-	get_online_cpus();
 	for_each_online_cpu(cpu) {
 		if ((pebs_broken = intel_snb_pebs_broken(cpu)))
 			break;
 	}
-	put_online_cpus();
 
 	if (pebs_broken == x86_pmu.pebs_broken)
 		return;
@@ -3467,7 +3465,9 @@ static bool check_msr(unsigned long msr,
 static __init void intel_sandybridge_quirk(void)
 {
 	x86_pmu.check_microcode = intel_snb_check_microcode;
+	get_online_cpus();
 	intel_snb_check_microcode();
+	put_online_cpus();
 }
 
 static const struct { int id; char *name; } intel_arch_events_map[] __initconst = {

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#1625274 — Re: [patch 16/20] perf/x86/intel: Drop get_online_cpus() in intel_snb_check_microcode()

On Sat, Apr 15, 2017 at 07:01:23PM +0200, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> 
> If intel_snb_check_microcode() is invoked via
>   microcode_init -> perf_check_microcode -> intel_snb_check_microcode
> 
> then get_online_cpus() is invoked nested. This works with the current
> implementation of get_online_cpus() but prevents converting it to a percpu
> rwsem.
> 
> intel_snb_check_microcode() is also invoked from intel_sandybridge_quirk()
> unprotected.
> 
> Drop get_online_cpus() from intel_snb_check_microcode() and add it to
> intel_sandybridge_quirk() so both call sites are protected.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: x86@kernel.org

Acked-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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#1624116 — [patch 09/20] hwtracing/coresight-etm4x: Use cpuhp_setup_state_nocalls_locked()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

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_locked() 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: linux-arm-kernel@lists.infradead.org

---
 drivers/hwtracing/coresight/coresight-etm4x.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -990,12 +990,12 @@ static int etm4_probe(struct amba_device
 		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_locked(CPUHP_AP_ARM_CORESIGHT_STARTING,
+						 "arm/coresight4:starting",
+						 etm4_starting_cpu, etm4_dying_cpu);
+		ret = cpuhp_setup_state_nocalls_locked(CPUHP_AP_ONLINE_DYN,
+						       "arm/coresight4:online",
+						       etm4_online_cpu, NULL);
 		if (ret < 0)
 			goto err_arch_supported;
 		hp_online = ret;

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#1624117 — [patch 10/20] perf/x86/intel/cqm: Use cpuhp_setup_state_locked()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

intel_cqm_init() holds get_online_cpus() while registerring the hotplug
callbacks.

cpuhp_setup_state() 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_locked() to avoid the nested call.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org
Cc: Fenghua Yu <fenghua.yu@intel.com>

---
 arch/x86/events/intel/cqm.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/arch/x86/events/intel/cqm.c
+++ b/arch/x86/events/intel/cqm.c
@@ -1746,12 +1746,12 @@ static int __init intel_cqm_init(void)
 	 * Setup the hot cpu notifier once we are sure cqm
 	 * is enabled to avoid notifier leak.
 	 */
-	cpuhp_setup_state(CPUHP_AP_PERF_X86_CQM_STARTING,
-			  "perf/x86/cqm:starting",
-			  intel_cqm_cpu_starting, NULL);
-	cpuhp_setup_state(CPUHP_AP_PERF_X86_CQM_ONLINE, "perf/x86/cqm:online",
-			  NULL, intel_cqm_cpu_exit);
-
+	cpuhp_setup_state_locked(CPUHP_AP_PERF_X86_CQM_STARTING,
+				 "perf/x86/cqm:starting",
+				 intel_cqm_cpu_starting, NULL);
+	cpuhp_setup_state_locked(CPUHP_AP_PERF_X86_CQM_ONLINE,
+				 "perf/x86/cqm:online",
+				 NULL, intel_cqm_cpu_exit);
 out:
 	put_online_cpus();
 

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#1624118 — [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

cpufreq holds get_online_cpus() while invoking cpuhp_setup_state_nocalls()
to make subsys_interface_register() and the registration of hotplug calls
atomic versus cpu hotplug.

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_locked() to avoid the nested call.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-pm@vger.kernel.org

---
 drivers/cpufreq/cpufreq.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2473,9 +2473,10 @@ int cpufreq_register_driver(struct cpufr
 		goto err_if_unreg;
 	}
 
-	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
-					cpuhp_cpufreq_online,
-					cpuhp_cpufreq_offline);
+	ret = cpuhp_setup_state_nocalls_locked(CPUHP_AP_ONLINE_DYN,
+					       "cpufreq:online",
+					       cpuhp_cpufreq_online,
+					       cpuhp_cpufreq_offline);
 	if (ret < 0)
 		goto err_if_unreg;
 	hp_online = ret;
@@ -2519,7 +2520,7 @@ int cpufreq_unregister_driver(struct cpu
 	get_online_cpus();
 	subsys_interface_unregister(&cpufreq_interface);
 	remove_boost_sysfs_file();
-	cpuhp_remove_state_nocalls(hp_online);
+	cpuhp_remove_state_nocalls_locked(hp_online);
 
 	write_lock_irqsave(&cpufreq_driver_lock, flags);
 

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#1624141 — Re: [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked()

On Sat, Apr 15, 2017 at 7:01 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> cpufreq holds get_online_cpus() while invoking cpuhp_setup_state_nocalls()
> to make subsys_interface_register() and the registration of hotplug calls
> atomic versus cpu hotplug.
>
> 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_locked() to avoid the nested call.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

>
> ---
>  drivers/cpufreq/cpufreq.c |    9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -2473,9 +2473,10 @@ int cpufreq_register_driver(struct cpufr
>                 goto err_if_unreg;
>         }
>
> -       ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
> -                                       cpuhp_cpufreq_online,
> -                                       cpuhp_cpufreq_offline);
> +       ret = cpuhp_setup_state_nocalls_locked(CPUHP_AP_ONLINE_DYN,
> +                                              "cpufreq:online",
> +                                              cpuhp_cpufreq_online,
> +                                              cpuhp_cpufreq_offline);
>         if (ret < 0)
>                 goto err_if_unreg;
>         hp_online = ret;
> @@ -2519,7 +2520,7 @@ int cpufreq_unregister_driver(struct cpu
>         get_online_cpus();
>         subsys_interface_unregister(&cpufreq_interface);
>         remove_boost_sysfs_file();
> -       cpuhp_remove_state_nocalls(hp_online);
> +       cpuhp_remove_state_nocalls_locked(hp_online);
>
>         write_lock_irqsave(&cpufreq_driver_lock, flags);
>
>
>

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#1624528 — Re: [patch 06/20] cpufreq: Use cpuhp_setup_state_nocalls_locked()

On 15-04-17, 19:01, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> 
> cpufreq holds get_online_cpus() while invoking cpuhp_setup_state_nocalls()
> to make subsys_interface_register() and the registration of hotplug calls
> atomic versus cpu hotplug.
> 
> 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_locked() to avoid the nested call.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> 
> ---
>  drivers/cpufreq/cpufreq.c |    9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -2473,9 +2473,10 @@ int cpufreq_register_driver(struct cpufr
>  		goto err_if_unreg;
>  	}
>  
> -	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
> -					cpuhp_cpufreq_online,
> -					cpuhp_cpufreq_offline);
> +	ret = cpuhp_setup_state_nocalls_locked(CPUHP_AP_ONLINE_DYN,
> +					       "cpufreq:online",
> +					       cpuhp_cpufreq_online,
> +					       cpuhp_cpufreq_offline);
>  	if (ret < 0)
>  		goto err_if_unreg;
>  	hp_online = ret;
> @@ -2519,7 +2520,7 @@ int cpufreq_unregister_driver(struct cpu
>  	get_online_cpus();
>  	subsys_interface_unregister(&cpufreq_interface);
>  	remove_boost_sysfs_file();
> -	cpuhp_remove_state_nocalls(hp_online);
> +	cpuhp_remove_state_nocalls_locked(hp_online);
>  
>  	write_lock_irqsave(&cpufreq_driver_lock, flags);

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh

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#1624119 — [patch 08/20] hwtracing/coresight-etm3x: Use the locked version of cpuhp_setup_state_nocalls()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

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_locked() 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: linux-arm-kernel@lists.infradead.org

---
 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 a51b6b64ecdf..0887265f361d 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_locked(CPUHP_AP_ARM_CORESIGHT_STARTING,
+						 "arm/coresight:starting",
+						 etm_starting_cpu, etm_dying_cpu);
+		ret = cpuhp_setup_state_nocalls_locked(CPUHP_AP_ONLINE_DYN,
+						       "arm/coresight:online",
+						       etm_online_cpu, NULL);
 		if (ret < 0)
 			goto err_arch_supported;
 		hp_online = ret;
-- 
2.11.0

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#1624120 — [patch 11/20] ARM/hw_breakpoint: Use cpuhp_setup_state_locked()

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

arch_hw_breakpoint_init() holds get_online_cpus() while registerring the
hotplug callbacks.

cpuhp_setup_state() 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_locked() to avoid the nested call.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org

---
 arch/arm/kernel/hw_breakpoint.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -1098,8 +1098,9 @@ static int __init arch_hw_breakpoint_ini
 	 * assume that a halting debugger will leave the world in a nice state
 	 * for us.
 	 */
-	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm/hw_breakpoint:online",
-				dbg_reset_online, NULL);
+	ret = cpuhp_setup_state_locked(CPUHP_AP_ONLINE_DYN,
+				       "arm/hw_breakpoint:online",
+				       dbg_reset_online, NULL);
 	unregister_undef_hook(&debug_reg_hook);
 	if (WARN_ON(ret < 0) || !cpumask_empty(&debug_err_mask)) {
 		core_num_brps = 0;

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