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From: Qais Yousef <qais.yousef@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 03/14] arm: arm64: Don't use disable_nonboot_cpus()
Date: Tue, 21 Jan 2020 16:50:31 +0000	[thread overview]
Message-ID: <20200121165030.xksivf6mrhsaynq2@e107158-lin.cambridge.arm.com> (raw)
In-Reply-To: <20191125112754.25223-4-qais.yousef@arm.com>

On 11/25/19 11:27, Qais Yousef wrote:
> disable_nonboot_cpus() is not safe to use when doing machine_down(),
> because it relies on freeze_secondary_cpus() which in return is
> a suspend/resume related freeze and could abort if the logic detects any
> pending activities that can prevent finishing the offlining process.
> 
> Beside disable_nonboot_cpus() is dependent on CONFIG_PM_SLEEP_SMP which
> is an othogonal config to rely on to ensure this function works
> correctly.
> 
> Signed-off-by: Qais Yousef <qais.yousef@arm.com>
> CC: Russell King <linux@armlinux.org.uk>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> CC: Will Deacon <will@kernel.org>
> CC: linux-arm-kernel@lists.infradead.org
> CC: linux-kernel@vger.kernel.org
> ---

Ping :)

I'm missing ACKs on this patch and patch 4 for arm64. Hopefully none should be
controversial.

Thanks!

--
Qais Yousef

>  arch/arm/kernel/reboot.c    | 4 ++--
>  arch/arm64/kernel/process.c | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/kernel/reboot.c b/arch/arm/kernel/reboot.c
> index bb18ed0539f4..58ad1a70f770 100644
> --- a/arch/arm/kernel/reboot.c
> +++ b/arch/arm/kernel/reboot.c
> @@ -88,11 +88,11 @@ void soft_restart(unsigned long addr)
>   * to execute e.g. a RAM-based pin loop is not sufficient. This allows the
>   * kexec'd kernel to use any and all RAM as it sees fit, without having to
>   * avoid any code or data used by any SW CPU pin loop. The CPU hotplug
> - * functionality embodied in disable_nonboot_cpus() to achieve this.
> + * functionality embodied in smp_shutdown_nonboot_cpus() to achieve this.
>   */
>  void machine_shutdown(void)
>  {
> -	disable_nonboot_cpus();
> +	smp_shutdown_nonboot_cpus(0);
>  }
>  
>  /*
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index 71f788cd2b18..3bcc9bfc581e 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -141,11 +141,11 @@ void arch_cpu_idle_dead(void)
>   * to execute e.g. a RAM-based pin loop is not sufficient. This allows the
>   * kexec'd kernel to use any and all RAM as it sees fit, without having to
>   * avoid any code or data used by any SW CPU pin loop. The CPU hotplug
> - * functionality embodied in disable_nonboot_cpus() to achieve this.
> + * functionality embodied in smpt_shutdown_nonboot_cpus() to achieve this.
>   */
>  void machine_shutdown(void)
>  {
> -	disable_nonboot_cpus();
> +	smp_shutdown_nonboot_cpus(0);
>  }
>  
>  /*
> -- 
> 2.17.1
> 

  reply	other threads:[~2020-01-21 16:50 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191125112754.25223-1-qais.yousef@arm.com>
2019-11-25 11:27 ` [PATCH v2 01/14] smp: Create a new function to shutdown nonboot cpus Qais Yousef
2020-01-21 17:03   ` Russell King - ARM Linux admin
2020-01-21 17:47     ` Qais Yousef
2020-01-21 18:09       ` Russell King - ARM Linux admin
2020-01-22 10:32         ` Qais Yousef
2019-11-25 11:27 ` [PATCH v2 02/14] ia64: Replace cpu_down with smp_shutdown_nonboot_cpus() Qais Yousef
2019-11-25 11:27 ` [PATCH v2 03/14] arm: arm64: Don't use disable_nonboot_cpus() Qais Yousef
2020-01-21 16:50   ` Qais Yousef [this message]
2020-01-21 16:53     ` Russell King - ARM Linux admin
2020-01-21 16:58       ` Qais Yousef
2020-01-21 17:05         ` Russell King - ARM Linux admin
2019-11-25 11:27 ` [PATCH v2 04/14] arm64: hibernate.c: Create a new function to handle cpu_up(sleep_cpu) Qais Yousef
2019-11-25 11:27 ` [PATCH v2 05/14] x86: Replace cpu_up/down with devcie_online/offline Qais Yousef
2019-11-25 11:27 ` [PATCH v2 06/14] powerpc: Replace cpu_up/down with device_online/offline Qais Yousef
2019-11-25 11:27 ` [PATCH v2 07/14] sparc: " Qais Yousef
2019-11-25 11:27 ` [PATCH v2 08/14] parisc: " Qais Yousef
2019-11-25 11:27 ` [PATCH v2 09/14] driver: base: cpu: Export device_online/offline Qais Yousef
2019-11-25 11:27 ` [PATCH v2 10/14] driver: xen: Replace cpu_up/down with device_online/offline Qais Yousef
2019-12-09  6:25   ` Jürgen Groß
2019-11-25 11:27 ` [PATCH v2 11/14] firmware: psci: " Qais Yousef
2019-11-25 11:27 ` [PATCH v2 12/14] torture: " Qais Yousef
2019-11-27 21:47   ` Paul E. McKenney
2019-11-28 16:56     ` Qais Yousef
2019-11-28 17:00       ` Qais Yousef
2019-11-28 21:02         ` Paul E. McKenney
2019-11-29  9:13           ` Qais Yousef
2019-11-29 20:38             ` Paul E. McKenney
2020-02-20 15:31               ` Qais Yousef
2020-02-21  0:26                 ` Paul E. McKenney
2020-02-21  9:35                   ` Qais Yousef
2020-02-21 20:39                     ` Paul E. McKenney
2019-11-25 11:27 ` [PATCH v2 13/14] smp: Create a new function to bringup nonboot cpus online Qais Yousef
2019-11-25 11:27 ` [PATCH v2 14/14] cpu: Hide cpu_up/down Qais Yousef

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