Linux-PM Archive on lore.kernel.org
 help / color / Atom feed
From: Viresh Kumar <viresh.kumar@linaro.org>
To: linux-pm@vger.kernel.org, edubezval@gmail.com
Cc: linaro-kernel@lists.linaro.org, rui.zhang@intel.com,
	Viresh Kumar <viresh.kumar@linaro.org>
Subject: [PATCH 12/26] cpu_cooling: Don't match min/max frequencies for all CPUs on cooling register
Date: Fri, 28 Nov 2014 15:14:06 +0530
Message-ID: <0ca43eb27849888b58a263bf589490b678bfffef.1417167599.git.viresh.kumar@linaro.org> (raw)
In-Reply-To: <cover.1417167599.git.viresh.kumar@linaro.org>
In-Reply-To: <cover.1417167599.git.viresh.kumar@linaro.org>

In __cpufreq_cooling_register() we try to match min/max frequencies for all CPUs
passed in 'clip_cpus' mask. This mask is the cpumask of cpus where the frequency
constraints will be applied.

Same frequency constraint can be applied only to the CPUs belonging to the same
cluster (i.e. CPUs sharing clock line). For all such CPUs we have a single
'struct cpufreq_policy' structure managing them and so getting policies for all
CPUs wouldn't make any sense as they will all return the same pointer.

So, remove this useless check of checking min/max for all CPUs. Also update doc
comment to make this more obvious that clip_cpus should be same as
policy->related_cpus.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/thermal/cpu_cooling.c | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 964586f..c358ede 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -434,6 +434,7 @@ static struct notifier_block thermal_cpufreq_notifier_block = {
  * __cpufreq_cooling_register - helper function to create cpufreq cooling device
  * @np: a valid struct device_node to the cooling device device tree node
  * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
+ * Normally this should be same as cpufreq policy->related_cpus.
  *
  * This interface function registers the cpufreq cooling device with the name
  * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
@@ -449,25 +450,9 @@ __cpufreq_cooling_register(struct device_node *np,
 {
 	struct thermal_cooling_device *cool_dev;
 	struct cpufreq_cooling_device *cpufreq_dev;
-	unsigned int min = 0, max = 0;
 	char dev_name[THERMAL_NAME_LENGTH];
-	int ret = 0, i;
-	struct cpufreq_policy policy;
+	int ret = 0;
 
-	/* Verify that all the clip cpus have same freq_min, freq_max limit */
-	for_each_cpu(i, clip_cpus) {
-		/* continue if cpufreq policy not found and not return error */
-		if (!cpufreq_get_policy(&policy, i))
-			continue;
-		if (min == 0 && max == 0) {
-			min = policy.cpuinfo.min_freq;
-			max = policy.cpuinfo.max_freq;
-		} else {
-			if (min != policy.cpuinfo.min_freq ||
-			    max != policy.cpuinfo.max_freq)
-				return ERR_PTR(-EINVAL);
-		}
-	}
 	cpufreq_dev = kzalloc(sizeof(*cool_dev), GFP_KERNEL);
 	if (!cpufreq_dev)
 		return ERR_PTR(-ENOMEM);
-- 
2.0.3.693.g996b0fd


  parent reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-28  9:43 [PATCH 00/26] thermal: cpu_cooling: Fixes and cleanups Viresh Kumar
2014-11-28  9:43 ` [PATCH 01/26] thermal: db8500: pass cpu_present_mask to cpufreq_cooling_register() Viresh Kumar
2014-11-28  9:43 ` [PATCH 02/26] thermal: imx: " Viresh Kumar
2014-11-28  9:43 ` [PATCH 03/26] thermal: exynos: " Viresh Kumar
2014-11-28  9:43 ` [PATCH 04/26] thermal: exynos: Handle -EPROBE_DEFER properly Viresh Kumar
2014-12-02 23:08   ` Eduardo Valentin
2014-11-28  9:43 ` [PATCH 05/26] cpu_cooling: random comment fixups Viresh Kumar
2014-12-02 23:09   ` Eduardo Valentin
2014-11-28  9:44 ` [PATCH 06/26] cpu_cooling: fix doc comment over struct cpufreq_cooling_device Viresh Kumar
2014-11-28  9:44 ` [PATCH 07/26] cpu_cooling: Add comment to clarify relation between cooling state and frequency Viresh Kumar
2014-11-28  9:44 ` [PATCH 08/26] cpu_cooling: Pass variable instead of its type to sizeof() Viresh Kumar
2014-12-02 15:26   ` Javi Merino
2014-12-02 23:07     ` Eduardo Valentin
2014-12-03  4:38       ` Viresh Kumar
2014-11-28  9:44 ` [PATCH 09/26] cpu_cooling: no need to set cpufreq_state to zero Viresh Kumar
2014-11-28  9:44 ` [PATCH 10/26] cpu_cooling: no need to set cpufreq_dev to NULL Viresh Kumar
2014-11-28  9:44 ` [PATCH 11/26] cpu_cooling: propagate error returned by idr_alloc() Viresh Kumar
2014-12-02 15:35   ` Javi Merino
2014-12-03  4:36     ` Viresh Kumar
2014-12-02 23:03   ` Eduardo Valentin
2014-11-28  9:44 ` Viresh Kumar [this message]
2014-11-28  9:44 ` [PATCH 13/26] cpu_cooling: don't iterate over all allowed_cpus to update cpufreq policy Viresh Kumar
2014-11-28  9:44 ` [PATCH 14/26] cpu_cooling: Don't check is_cpufreq_valid() Viresh Kumar
2014-11-28  9:44 ` [PATCH 15/26] cpu_cooling: do error handling at the bottom in __cpufreq_cooling_register() Viresh Kumar
2014-12-02 15:45   ` Javi Merino
2014-11-28  9:44 ` [PATCH 16/26] cpu_cooling: Drop useless locking around idr_alloc/idr_remove Viresh Kumar
2014-12-02 15:53   ` Javi Merino
2014-12-02 23:05   ` Eduardo Valentin
2014-12-03  9:32     ` Viresh Kumar
2014-11-28  9:44 ` [PATCH 17/26] cpu_cooling: Merge cpufreq_apply_cooling() into cpufreq_set_cur_state() Viresh Kumar
2014-11-28  9:44 ` [PATCH 18/26] cpu_cooling: Merge get_cpu_frequency() " Viresh Kumar
2014-11-28  9:44 ` [PATCH 19/26] cpu_cooling: find max level during device registration Viresh Kumar
2014-12-02 23:39   ` Eduardo Valentin
2014-12-03  4:57     ` Viresh Kumar
2014-12-03 13:40       ` Eduardo Valentin
2014-11-28  9:44 ` [PATCH 20/26] cpu_cooling: get_property() doesn't need to support GET_MAXL anymore Viresh Kumar
2014-11-28  9:44 ` [PATCH 21/26] cpu_cooling: create list of cpufreq_cooling_devices Viresh Kumar
2014-12-02 23:12   ` Eduardo Valentin
2014-11-28  9:44 ` [PATCH 22/26] cpu_cooling: use cpufreq_dev_list instead of cpufreq_dev_count Viresh Kumar
2014-11-28  9:44 ` [PATCH 23/26] cpu_cooling: Pass 'cpufreq_dev' to get_property() Viresh Kumar
2014-11-28  9:44 ` [PATCH 24/26] cpu_cooling: Store frequencies in descending order Viresh Kumar
2014-12-02 23:21   ` Eduardo Valentin
2014-12-03  4:52     ` Viresh Kumar
2014-12-03 13:41       ` Eduardo Valentin
     [not found]         ` <CAKohponw7E9yyvjhP97CzjtcFcq3N+5ysde7DR5q+Nm0s=bKAw@mail.gmail.com>
2014-12-03 14:00           ` Eduardo Valentin
2014-11-28  9:44 ` [PATCH 25/26] cpu_cooling: Use cpufreq_dev->freq_table for finding level/freq Viresh Kumar
2014-12-02 23:36   ` Eduardo Valentin
2014-12-03  5:10     ` Viresh Kumar
2014-12-03 13:32       ` Eduardo Valentin
2014-11-28  9:44 ` [PATCH 26/26] cpu_cooling: update copyright tags Viresh Kumar
2014-12-02 19:41   ` Eduardo Valentin
2014-12-03  4:34     ` Viresh Kumar
2014-12-04  4:41       ` amit daniel kachhap
2014-11-28 13:26 ` [PATCH 00/26] thermal: cpu_cooling: Fixes and cleanups Eduardo Valentin
2014-11-28 13:41   ` Viresh Kumar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=0ca43eb27849888b58a263bf589490b678bfffef.1417167599.git.viresh.kumar@linaro.org \
    --to=viresh.kumar@linaro.org \
    --cc=edubezval@gmail.com \
    --cc=linaro-kernel@lists.linaro.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=rui.zhang@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-pm/0 linux-pm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pm linux-pm/ https://lore.kernel.org/linux-pm \
		linux-pm@vger.kernel.org
	public-inbox-index linux-pm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git