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[PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level

Started bySebastian Andrzej Siewior <bigeasy@linutronix.de>
First post2016-07-20 17:30 +0200
Last post2016-07-22 22:00 +0200
Articles 4 — 4 participants

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  [PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-07-20 17:30 +0200
    Re: [PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level Jacek Anaszewski <j.anaszewski@samsung.com> - 2016-07-21 08:50 +0200
    Re: [PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level Linus Walleij <linus.walleij@linaro.org> - 2016-07-22 17:30 +0200
    [tip:smp/hotplug] leds/trigger/cpu: Move from CPU_STARTING to  ONLINE level tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-07-22 22:00 +0200

#1447293 — [PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level

FromSebastian Andrzej Siewior <bigeasy@linutronix.de>
Date2016-07-20 17:30 +0200
Subject[PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level
Message-ID<rX1BD-39C-9@gated-at.bofh.it>
There is no need the ledtriger to be called *that* early in the hotplug
process (+ with disabled interrupts). As explained by Jacek Anaszewski [0]
there is no need for it.
Therefore this patch moves it to the ONLINE/PREPARE_DOWN level using the
dynamic registration for the id.

[0] https://lkml.kernel.org/r/578C92BC.2070603@samsung.com

Cc: Jacek Anaszewski <j.anaszewski@samsung.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-leds@vger.kernel.org
Cc: rt@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/leds/trigger/ledtrig-cpu.c | 16 ++++++++--------
 include/linux/cpuhotplug.h         |  1 -
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
index 4a6a182d0a88..22f0634dd3fa 100644
--- a/drivers/leds/trigger/ledtrig-cpu.c
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -92,13 +92,13 @@ static struct syscore_ops ledtrig_cpu_syscore_ops = {
 	.resume		= ledtrig_cpu_syscore_resume,
 };
 
-static int ledtrig_starting_cpu(unsigned int cpu)
+static int ledtrig_online_cpu(unsigned int cpu)
 {
 	ledtrig_cpu(CPU_LED_START);
 	return 0;
 }
 
-static int ledtrig_dying_cpu(unsigned int cpu)
+static int ledtrig_prepare_down_cpu(unsigned int cpu)
 {
 	ledtrig_cpu(CPU_LED_STOP);
 	return 0;
@@ -107,6 +107,7 @@ static int ledtrig_dying_cpu(unsigned int cpu)
 static int __init ledtrig_cpu_init(void)
 {
 	int cpu;
+	int ret;
 
 	/* Supports up to 9999 cpu cores */
 	BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);
@@ -126,12 +127,11 @@ static int __init ledtrig_cpu_init(void)
 
 	register_syscore_ops(&ledtrig_cpu_syscore_ops);
 
-	/*
-	 * FIXME: Why needs this to happen in the interrupt disabled
-	 * low level bringup phase of a cpu?
-	 */
-	cpuhp_setup_state(CPUHP_AP_LEDTRIG_STARTING, "AP_LEDTRIG_STARTING",
-			  ledtrig_starting_cpu, ledtrig_dying_cpu);
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_LEDTRIG_STARTING",
+				ledtrig_online_cpu, ledtrig_prepare_down_cpu);
+	if (ret < 0)
+		pr_err("CPU hotplug notifier for ledtrig-cpu could not be registered: %d\n",
+		       ret);
 
 	pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
 
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 09ef54bcba39..282800b42627 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -65,7 +65,6 @@ enum cpuhp_state {
 	CPUHP_AP_ARM_CORESIGHT_STARTING,
 	CPUHP_AP_ARM_CORESIGHT4_STARTING,
 	CPUHP_AP_ARM64_ISNDEP_STARTING,
-	CPUHP_AP_LEDTRIG_STARTING,
 	CPUHP_AP_SMPCFD_DYING,
 	CPUHP_AP_X86_TBOOT_DYING,
 	CPUHP_AP_NOTIFY_STARTING,
-- 
2.8.1

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#1447645

FromJacek Anaszewski <j.anaszewski@samsung.com>
Date2016-07-21 08:50 +0200
Message-ID<rXfXX-3QS-7@gated-at.bofh.it>
In reply to#1447293
Hi Sebastian,

On 07/20/2016 05:24 PM, Sebastian Andrzej Siewior wrote:
> There is no need the ledtriger to be called *that* early in the hotplug
> process (+ with disabled interrupts). As explained by Jacek Anaszewski [0]
> there is no need for it.
> Therefore this patch moves it to the ONLINE/PREPARE_DOWN level using the
> dynamic registration for the id.
>
> [0] https://lkml.kernel.org/r/578C92BC.2070603@samsung.com
>
> Cc: Jacek Anaszewski <j.anaszewski@samsung.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Richard Purdie <rpurdie@rpsys.net>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-leds@vger.kernel.org
> Cc: rt@linutronix.de
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
>   drivers/leds/trigger/ledtrig-cpu.c | 16 ++++++++--------
>   include/linux/cpuhotplug.h         |  1 -
>   2 files changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
> index 4a6a182d0a88..22f0634dd3fa 100644
> --- a/drivers/leds/trigger/ledtrig-cpu.c
> +++ b/drivers/leds/trigger/ledtrig-cpu.c
> @@ -92,13 +92,13 @@ static struct syscore_ops ledtrig_cpu_syscore_ops = {
>   	.resume		= ledtrig_cpu_syscore_resume,
>   };
>
> -static int ledtrig_starting_cpu(unsigned int cpu)
> +static int ledtrig_online_cpu(unsigned int cpu)
>   {
>   	ledtrig_cpu(CPU_LED_START);
>   	return 0;
>   }
>
> -static int ledtrig_dying_cpu(unsigned int cpu)
> +static int ledtrig_prepare_down_cpu(unsigned int cpu)
>   {
>   	ledtrig_cpu(CPU_LED_STOP);
>   	return 0;
> @@ -107,6 +107,7 @@ static int ledtrig_dying_cpu(unsigned int cpu)
>   static int __init ledtrig_cpu_init(void)
>   {
>   	int cpu;
> +	int ret;
>
>   	/* Supports up to 9999 cpu cores */
>   	BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);
> @@ -126,12 +127,11 @@ static int __init ledtrig_cpu_init(void)
>
>   	register_syscore_ops(&ledtrig_cpu_syscore_ops);
>
> -	/*
> -	 * FIXME: Why needs this to happen in the interrupt disabled
> -	 * low level bringup phase of a cpu?
> -	 */
> -	cpuhp_setup_state(CPUHP_AP_LEDTRIG_STARTING, "AP_LEDTRIG_STARTING",
> -			  ledtrig_starting_cpu, ledtrig_dying_cpu);
> +	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_LEDTRIG_STARTING",
> +				ledtrig_online_cpu, ledtrig_prepare_down_cpu);
> +	if (ret < 0)
> +		pr_err("CPU hotplug notifier for ledtrig-cpu could not be registered: %d\n",
> +		       ret);
>
>   	pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
>
> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> index 09ef54bcba39..282800b42627 100644
> --- a/include/linux/cpuhotplug.h
> +++ b/include/linux/cpuhotplug.h
> @@ -65,7 +65,6 @@ enum cpuhp_state {
>   	CPUHP_AP_ARM_CORESIGHT_STARTING,
>   	CPUHP_AP_ARM_CORESIGHT4_STARTING,
>   	CPUHP_AP_ARM64_ISNDEP_STARTING,
> -	CPUHP_AP_LEDTRIG_STARTING,
>   	CPUHP_AP_SMPCFD_DYING,
>   	CPUHP_AP_X86_TBOOT_DYING,
>   	CPUHP_AP_NOTIFY_STARTING,
>

Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>

-- 
Best regards,
Jacek Anaszewski

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#1448635

FromLinus Walleij <linus.walleij@linaro.org>
Date2016-07-22 17:30 +0200
Message-ID<rXKyJ-7ye-15@gated-at.bofh.it>
In reply to#1447293
On Wed, Jul 20, 2016 at 5:24 PM, Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:

> There is no need the ledtriger to be called *that* early in the hotplug
> process (+ with disabled interrupts). As explained by Jacek Anaszewski [0]
> there is no need for it.
> Therefore this patch moves it to the ONLINE/PREPARE_DOWN level using the
> dynamic registration for the id.
>
> [0] https://lkml.kernel.org/r/578C92BC.2070603@samsung.com
>
> Cc: Jacek Anaszewski <j.anaszewski@samsung.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Richard Purdie <rpurdie@rpsys.net>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-leds@vger.kernel.org
> Cc: rt@linutronix.de
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Read back on the discussion, this change makes all kind of sense.
Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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#1448744 — [tip:smp/hotplug] leds/trigger/cpu: Move from CPU_STARTING to ONLINE level

Fromtip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com>
Date2016-07-22 22:00 +0200
Subject[tip:smp/hotplug] leds/trigger/cpu: Move from CPU_STARTING to ONLINE level
Message-ID<rXOM2-1Io-5@gated-at.bofh.it>
In reply to#1447293
Commit-ID:  cd894f149732a06ba4b2ccdc4cb86edf7ff68620
Gitweb:     http://git.kernel.org/tip/cd894f149732a06ba4b2ccdc4cb86edf7ff68620
Author:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
AuthorDate: Wed, 20 Jul 2016 17:24:55 +0200
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 22 Jul 2016 21:53:18 +0200

leds/trigger/cpu: Move from CPU_STARTING to ONLINE level

There is no need the ledtriger to be called *that* early in the hotplug
process (+ with disabled interrupts). As explained by Jacek Anaszewski [0]
there is no need for it.
Therefore this patch moves it to the ONLINE/PREPARE_DOWN level using the
dynamic registration for the id.

[0] https://lkml.kernel.org/r/578C92BC.2070603@samsung.com

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: rt@linutronix.de
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-leds@vger.kernel.org
Link: http://lkml.kernel.org/r/1469028295-14702-1-git-send-email-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 drivers/leds/trigger/ledtrig-cpu.c | 16 ++++++++--------
 include/linux/cpuhotplug.h         |  1 -
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
index 4a6a182..22f0634 100644
--- a/drivers/leds/trigger/ledtrig-cpu.c
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -92,13 +92,13 @@ static struct syscore_ops ledtrig_cpu_syscore_ops = {
 	.resume		= ledtrig_cpu_syscore_resume,
 };
 
-static int ledtrig_starting_cpu(unsigned int cpu)
+static int ledtrig_online_cpu(unsigned int cpu)
 {
 	ledtrig_cpu(CPU_LED_START);
 	return 0;
 }
 
-static int ledtrig_dying_cpu(unsigned int cpu)
+static int ledtrig_prepare_down_cpu(unsigned int cpu)
 {
 	ledtrig_cpu(CPU_LED_STOP);
 	return 0;
@@ -107,6 +107,7 @@ static int ledtrig_dying_cpu(unsigned int cpu)
 static int __init ledtrig_cpu_init(void)
 {
 	int cpu;
+	int ret;
 
 	/* Supports up to 9999 cpu cores */
 	BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);
@@ -126,12 +127,11 @@ static int __init ledtrig_cpu_init(void)
 
 	register_syscore_ops(&ledtrig_cpu_syscore_ops);
 
-	/*
-	 * FIXME: Why needs this to happen in the interrupt disabled
-	 * low level bringup phase of a cpu?
-	 */
-	cpuhp_setup_state(CPUHP_AP_LEDTRIG_STARTING, "AP_LEDTRIG_STARTING",
-			  ledtrig_starting_cpu, ledtrig_dying_cpu);
+	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "AP_LEDTRIG_STARTING",
+				ledtrig_online_cpu, ledtrig_prepare_down_cpu);
+	if (ret < 0)
+		pr_err("CPU hotplug notifier for ledtrig-cpu could not be registered: %d\n",
+		       ret);
 
 	pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
 
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 5015f46..6d405db 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -66,7 +66,6 @@ enum cpuhp_state {
 	CPUHP_AP_ARM_CORESIGHT_STARTING,
 	CPUHP_AP_ARM_CORESIGHT4_STARTING,
 	CPUHP_AP_ARM64_ISNDEP_STARTING,
-	CPUHP_AP_LEDTRIG_STARTING,
 	CPUHP_AP_SMPCFD_DYING,
 	CPUHP_AP_X86_TBOOT_DYING,
 	CPUHP_AP_NOTIFY_STARTING,

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