From: Ulf Hansson <ulf.hansson@linaro.org> To: "Rafael J . Wysocki" <rjw@rjwysocki.net>, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-pm@vger.kernel.org Cc: Ulf Hansson <ulf.hansson@linaro.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Vincent Guittot <vincent.guittot@linaro.org>, linux-arm-msm@vger.kernel.org, Lina Iyer <ilina@codeaurora.org>, Sudeep Holla <sudeep.holla@arm.com>, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 2/2] ARM: cpuidle: Convert to use cpuidle_register|unregister() Date: Thu, 1 Nov 2018 11:15:58 +0100 [thread overview] Message-ID: <20181101101558.3035-1-ulf.hansson@linaro.org> (raw) The only reason that remains, to why the ARM cpuidle driver calls cpuidle_register_driver(), is to avoid printing an error message in case another driver already have been registered for the CPU. This seems a bit silly, but more importantly, if that is a common scenario, perhaps we should change cpuidle_register() accordingly instead. In either case, let's consolidate the code, by converting to use cpuidle_register|unregister(), which also avoids the unnecessary allocation of the struct cpuidle_device. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- Changes in v2: - Fixup spelling in changelog. - Added Lorenzo's reviewed-by tag. --- drivers/cpuidle/cpuidle-arm.c | 30 +++--------------------------- 1 file changed, 3 insertions(+), 27 deletions(-) diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c index df564d783216..3a407a3ef22b 100644 --- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -82,7 +82,6 @@ static int __init arm_idle_init_cpu(int cpu) { int ret; struct cpuidle_driver *drv; - struct cpuidle_device *dev; drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL); if (!drv) @@ -119,33 +118,12 @@ static int __init arm_idle_init_cpu(int cpu) goto out_kfree_drv; } - ret = cpuidle_register_driver(drv); - if (ret) { - if (ret != -EBUSY) - pr_err("Failed to register cpuidle driver\n"); + ret = cpuidle_register(drv, NULL); + if (ret) goto out_kfree_drv; - } - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (!dev) { - ret = -ENOMEM; - goto out_unregister_drv; - } - dev->cpu = cpu; - - ret = cpuidle_register_device(dev); - if (ret) { - pr_err("Failed to register cpuidle device for CPU %d\n", - cpu); - goto out_kfree_dev; - } return 0; -out_kfree_dev: - kfree(dev); -out_unregister_drv: - cpuidle_unregister_driver(drv); out_kfree_drv: kfree(drv); return ret; @@ -176,9 +154,7 @@ static int __init arm_idle_init(void) while (--cpu >= 0) { dev = per_cpu(cpuidle_devices, cpu); drv = cpuidle_get_cpu_driver(dev); - cpuidle_unregister_device(dev); - cpuidle_unregister_driver(drv); - kfree(dev); + cpuidle_unregister(drv); kfree(drv); } -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: ulf.hansson@linaro.org (Ulf Hansson) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 2/2] ARM: cpuidle: Convert to use cpuidle_register|unregister() Date: Thu, 1 Nov 2018 11:15:58 +0100 [thread overview] Message-ID: <20181101101558.3035-1-ulf.hansson@linaro.org> (raw) The only reason that remains, to why the ARM cpuidle driver calls cpuidle_register_driver(), is to avoid printing an error message in case another driver already have been registered for the CPU. This seems a bit silly, but more importantly, if that is a common scenario, perhaps we should change cpuidle_register() accordingly instead. In either case, let's consolidate the code, by converting to use cpuidle_register|unregister(), which also avoids the unnecessary allocation of the struct cpuidle_device. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- Changes in v2: - Fixup spelling in changelog. - Added Lorenzo's reviewed-by tag. --- drivers/cpuidle/cpuidle-arm.c | 30 +++--------------------------- 1 file changed, 3 insertions(+), 27 deletions(-) diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c index df564d783216..3a407a3ef22b 100644 --- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -82,7 +82,6 @@ static int __init arm_idle_init_cpu(int cpu) { int ret; struct cpuidle_driver *drv; - struct cpuidle_device *dev; drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL); if (!drv) @@ -119,33 +118,12 @@ static int __init arm_idle_init_cpu(int cpu) goto out_kfree_drv; } - ret = cpuidle_register_driver(drv); - if (ret) { - if (ret != -EBUSY) - pr_err("Failed to register cpuidle driver\n"); + ret = cpuidle_register(drv, NULL); + if (ret) goto out_kfree_drv; - } - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (!dev) { - ret = -ENOMEM; - goto out_unregister_drv; - } - dev->cpu = cpu; - - ret = cpuidle_register_device(dev); - if (ret) { - pr_err("Failed to register cpuidle device for CPU %d\n", - cpu); - goto out_kfree_dev; - } return 0; -out_kfree_dev: - kfree(dev); -out_unregister_drv: - cpuidle_unregister_driver(drv); out_kfree_drv: kfree(drv); return ret; @@ -176,9 +154,7 @@ static int __init arm_idle_init(void) while (--cpu >= 0) { dev = per_cpu(cpuidle_devices, cpu); drv = cpuidle_get_cpu_driver(dev); - cpuidle_unregister_device(dev); - cpuidle_unregister_driver(drv); - kfree(dev); + cpuidle_unregister(drv); kfree(drv); } -- 2.17.1
next reply other threads:[~2018-11-01 10:15 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-11-01 10:15 Ulf Hansson [this message] 2018-11-01 10:15 ` [PATCH v2 2/2] ARM: cpuidle: Convert to use cpuidle_register|unregister() Ulf Hansson 2018-11-02 11:24 ` Daniel Lezcano 2018-11-02 11:24 ` Daniel Lezcano
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