From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751452AbcGUGs5 (ORCPT ); Thu, 21 Jul 2016 02:48:57 -0400 Received: from mailout1.w1.samsung.com ([210.118.77.11]:59483 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750917AbcGUGsy (ORCPT ); Thu, 21 Jul 2016 02:48:54 -0400 X-AuditID: cbfec7f4-f796c6d000001486-db-57907053b83e Message-id: <57907051.5090200@samsung.com> Date: Thu, 21 Jul 2016 08:48:49 +0200 From: Jacek Anaszewski User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130804 Thunderbird/17.0.8 MIME-version: 1.0 To: Sebastian Andrzej Siewior Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, Linus Torvalds , Linus Walleij , Paul Gortmaker , Peter Zijlstra , Richard Purdie , Thomas Gleixner , linux-leds@vger.kernel.org, rt@linutronix.de Subject: Re: [PATCH] leds/trigger/cpu: move from CPU_STARTING to ONLINE level References: <1469028295-14702-1-git-send-email-bigeasy@linutronix.de> In-reply-to: <1469028295-14702-1-git-send-email-bigeasy@linutronix.de> Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrDLMWRmVeSWpSXmKPExsVy+t/xK7rBBRPCDRb+Z7aYdnESs8WUP8uZ LC7vmsNmsfXNOkaL1f9OMVpc23uc2eJ47wEmi927nrJaXL1zkNFi86apzBaP+t6yO3B7bF6h 5bFpVSebx51re9g83p07x+5xYsZvFo8983+wenzeJOexfstWpgCOKC6blNSczLLUIn27BK6M wwvzC05KVuyeM5WxgbFTtIuRk0NCwETi5NcdrBC2mMSFe+vZQGwhgaWMEqu/GnYxcgHZzxgl ns6YwQSS4BXQkniy7BgLiM0ioCox+dU8sGY2AUOJny9eg9WICkRI/Dm9jxWiXlDix+R7YPUi AqYSjRcPsYAMZRZ4xiTx4to0ZpCEsICvxLaD61kgNrtKLJh7GqiZg4NTwE2iczU/SJhZwFpi 5aRtjBC2vMTmNW+ZJzAKzEKyYhaSsllIyhYwMq9iFE0tTS4oTkrPNdQrTswtLs1L10vOz93E CImTLzsYFx+zOsQowMGoxMObsLI/XIg1say4MvcQowQHs5IIb2nuhHAh3pTEyqrUovz4otKc 1OJDjNIcLErivHN3vQ8REkhPLEnNTk0tSC2CyTJxcEo1MM7iU5R6Gub9R9PELvhs2jIWXomt VT8LCuT5uNwndlpoBfpIeJveurfuednqzkJ1pTIOm0PHMrfl8R8tPtYb/JibLeeO1xmZA4vb r2fPa2g1Ky524lDtKq22bjlrdvEAu/1utTj2bQ8Xr9li9evoFKddLVfDN6gZnA+N3/5N4Uh6 3z8G9bIXSizFGYmGWsxFxYkAB7E8ao8CAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > Cc: Linus Torvalds > Cc: Linus Walleij > Cc: Paul Gortmaker > Cc: Peter Zijlstra > Cc: Richard Purdie > Cc: Thomas Gleixner > Cc: linux-leds@vger.kernel.org > Cc: rt@linutronix.de > Signed-off-by: Sebastian Andrzej Siewior > --- > 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 -- Best regards, Jacek Anaszewski