From: "Paul E. McKenney" <paulmck@kernel.org>
To: Qais Yousef <qais.yousef@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Davidlohr Bueso <dave@stgolabs.net>,
Josh Triplett <josh@joshtriplett.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 13/15] torture: Replace cpu_up/down with add/remove_cpu
Date: Sun, 23 Feb 2020 18:53:03 -0800 [thread overview]
Message-ID: <20200224025303.GH2935@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20200223192942.18420-14-qais.yousef@arm.com>
On Sun, Feb 23, 2020 at 07:29:40PM +0000, Qais Yousef wrote:
> The core device API performs extra housekeeping bits that are missing
> from directly calling cpu_up/down.
>
> See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
> serialization during LPM") for an example description of what might go
> wrong.
>
> This also prepares to make cpu_up/down a private interface for anything
> but the cpu subsystem.
>
> Signed-off-by: Qais Yousef <qais.yousef@arm.com>
> CC: Davidlohr Bueso <dave@stgolabs.net>
> CC: "Paul E. McKenney" <paulmck@kernel.org>
> CC: Josh Triplett <josh@joshtriplett.org>
> CC: linux-kernel@vger.kernel.org
From a torture-test perspective:
Acked-by: Paul E. McKenney <paulmck@kernel.org>
> ---
> kernel/torture.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/torture.c b/kernel/torture.c
> index 7c13f5558b71..a479689eac73 100644
> --- a/kernel/torture.c
> +++ b/kernel/torture.c
> @@ -97,7 +97,7 @@ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
> torture_type, cpu);
> starttime = jiffies;
> (*n_offl_attempts)++;
> - ret = cpu_down(cpu);
> + ret = remove_cpu(cpu);
> if (ret) {
> if (verbose)
> pr_alert("%s" TORTURE_FLAG
> @@ -148,7 +148,7 @@ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
> torture_type, cpu);
> starttime = jiffies;
> (*n_onl_attempts)++;
> - ret = cpu_up(cpu);
> + ret = add_cpu(cpu);
> if (ret) {
> if (verbose)
> pr_alert("%s" TORTURE_FLAG
> @@ -192,17 +192,18 @@ torture_onoff(void *arg)
> for_each_online_cpu(cpu)
> maxcpu = cpu;
> WARN_ON(maxcpu < 0);
> - if (!IS_MODULE(CONFIG_TORTURE_TEST))
> + if (!IS_MODULE(CONFIG_TORTURE_TEST)) {
> for_each_possible_cpu(cpu) {
> if (cpu_online(cpu))
> continue;
> - ret = cpu_up(cpu);
> + ret = add_cpu(cpu);
> if (ret && verbose) {
> pr_alert("%s" TORTURE_FLAG
> "%s: Initial online %d: errno %d\n",
> __func__, torture_type, cpu, ret);
> }
> }
> + }
>
> if (maxcpu == 0) {
> VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");
> --
> 2.17.1
>
next prev parent reply other threads:[~2020-02-24 2:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200223192942.18420-1-qais.yousef@arm.com>
2020-02-23 19:29 ` [PATCH v3 01/15] cpu: Add new {add,remove}_cpu() functions Qais Yousef
2020-02-23 19:29 ` [PATCH v3 02/15] smp: Create a new function to shutdown nonboot cpus Qais Yousef
2020-02-23 19:29 ` [PATCH v3 03/15] ia64: Replace cpu_down with smp_shutdown_nonboot_cpus() Qais Yousef
2020-02-23 19:29 ` [PATCH v3 04/15] arm: Don't use disable_nonboot_cpus() Qais Yousef
2020-03-20 11:04 ` Qais Yousef
2020-03-20 13:07 ` Russell King - ARM Linux admin
2020-03-20 13:41 ` Qais Yousef
2020-02-23 19:29 ` [PATCH v3 05/15] arm64: " Qais Yousef
2020-03-17 11:21 ` Catalin Marinas
2020-03-20 14:07 ` Qais Yousef
2020-02-23 19:29 ` [PATCH v3 06/15] arm64: hibernate.c: Create a new function to handle cpu_up(sleep_cpu) Qais Yousef
2020-03-17 11:21 ` Catalin Marinas
2020-02-23 19:29 ` [PATCH v3 07/15] x86: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-02-23 19:29 ` [PATCH v3 08/15] powerpc: " Qais Yousef
2020-02-23 19:29 ` [PATCH v3 09/15] sparc: " Qais Yousef
2020-02-23 19:29 ` [PATCH v3 10/15] parisc: " Qais Yousef
2020-02-23 19:29 ` [PATCH v3 11/15] driver: xen: Replace cpu_up/down with device_online/offline Qais Yousef
2020-02-23 19:29 ` [PATCH v3 12/15] firmware: psci: Replace cpu_up/down with add/remove_cpu Qais Yousef
2020-02-23 19:29 ` [PATCH v3 13/15] torture: " Qais Yousef
2020-02-24 2:53 ` Paul E. McKenney [this message]
2020-02-23 19:29 ` [PATCH v3 14/15] smp: Create a new function to bringup nonboot cpus online Qais Yousef
2020-02-23 19:29 ` [PATCH v3 15/15] cpu: Hide cpu_up/down Qais Yousef
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