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Date: Mon, 26 Oct 2020 12:20:21 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: chanwoo@...nel.org, myungjoo.ham@...sung.com,
kyungmin.park@...sung.com
Subject: Re: [PATCH v2] PM / devfreq: Remove redundant governor_name from
struct devfreq
On 10/23/20 7:32 PM, Chanwoo Choi wrote:
> The devfreq structure instance contains the governor_name and a governor
> instance. When need to show the governor name, better to use the name
> of devfreq_governor structure. So, governor_name variable in struct devfreq
> is a redundant and unneeded variable. Remove the redundant governor_name
> of struct devfreq and then use the name of devfreq_governor instance.
>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
> Changes from v1:
> - Rebase it on "[PATCH v5 0/2] PM / devfreq: Add governor feature and attribute flag"
>
> drivers/devfreq/devfreq.c | 18 +++++++-----------
> drivers/devfreq/governor.h | 2 ++
> include/linux/devfreq.h | 4 ----
> 3 files changed, 9 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index f6c55cf498ed..74f71588ace5 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -811,7 +811,6 @@ struct devfreq *devfreq_add_device(struct device *dev,
> devfreq->dev.release = devfreq_dev_release;
> INIT_LIST_HEAD(&devfreq->node);
> devfreq->profile = profile;
> - strscpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
> devfreq->previous_freq = profile->initial_freq;
> devfreq->last_status.current_frequency = profile->initial_freq;
> devfreq->data = data;
> @@ -907,7 +906,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
>
> mutex_lock(&devfreq_list_lock);
>
> - governor = try_then_request_governor(devfreq->governor_name);
> + governor = try_then_request_governor(governor_name);
> if (IS_ERR(governor)) {
> dev_err(dev, "%s: Unable to find governor for the device\n",
> __func__);
> @@ -1250,7 +1249,7 @@ int devfreq_add_governor(struct devfreq_governor *governor)
> int ret = 0;
> struct device *dev = devfreq->dev.parent;
>
> - if (!strncmp(devfreq->governor_name, governor->name,
> + if (!strncmp(devfreq->governor->name, governor->name,
> DEVFREQ_NAME_LEN)) {
> /* The following should never occur */
> if (devfreq->governor) {
> @@ -1312,7 +1311,7 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
> int ret;
> struct device *dev = devfreq->dev.parent;
>
> - if (!strncmp(devfreq->governor_name, governor->name,
> + if (!strncmp(devfreq->governor->name, governor->name,
> DEVFREQ_NAME_LEN)) {
> /* we should have a devfreq governor! */
> if (!devfreq->governor) {
> @@ -1407,7 +1406,6 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
> */
> prev_governor = df->governor;
> df->governor = governor;
> - strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
> ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
> if (ret) {
> dev_warn(dev, "%s: Governor %s not started(%d)\n",
> @@ -1415,13 +1413,11 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
>
> /* Restore previous governor */
> df->governor = prev_governor;
> - strncpy(df->governor_name, prev_governor->name,
> - DEVFREQ_NAME_LEN);
> ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
> if (ret) {
> dev_err(dev,
> "%s: reverting to Governor %s failed (%d)\n",
> - __func__, df->governor_name, ret);
> + __func__, prev_governor->name, ret);
> df->governor = NULL;
> goto out;
> }
> @@ -1457,7 +1453,7 @@ static ssize_t available_governors_show(struct device *d,
> */
> if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) {
> count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
> - "%s ", df->governor_name);
> + "%s ", df->governor->name);
> /*
> * The devfreq device shows the registered governor except for
> * immutable governors such as passive governor .
> @@ -1900,7 +1896,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data)
>
> list_for_each_entry_reverse(devfreq, &devfreq_list, node) {
> #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
> - if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE,
> + if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE,
> DEVFREQ_NAME_LEN)) {
> struct devfreq_passive_data *data = devfreq->data;
>
> @@ -1926,7 +1922,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data)
> "%-30s %-30s %-15s %-10s %10d %12ld %12ld %12ld\n",
> dev_name(&devfreq->dev),
> p_devfreq ? dev_name(&p_devfreq->dev) : "null",
> - devfreq->governor_name,
> + devfreq->governor->name,
> polling_ms ? timer_name[timer] : "null",
> polling_ms,
> cur_freq,
> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
> index df413b851bb2..2a52f97b542d 100644
> --- a/drivers/devfreq/governor.h
> +++ b/drivers/devfreq/governor.h
> @@ -13,6 +13,8 @@
>
> #include <linux/devfreq.h>
>
> +#define DEVFREQ_NAME_LEN 16
> +
> #define to_devfreq(DEV) container_of((DEV), struct devfreq, dev)
>
> /* Devfreq events */
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 2f4a74efa6be..82156721f459 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -15,8 +15,6 @@
> #include <linux/pm_opp.h>
> #include <linux/pm_qos.h>
>
> -#define DEVFREQ_NAME_LEN 16
> -
> /* DEVFREQ governor name */
> #define DEVFREQ_GOV_SIMPLE_ONDEMAND "simple_ondemand"
> #define DEVFREQ_GOV_PERFORMANCE "performance"
> @@ -139,7 +137,6 @@ struct devfreq_stats {
> * using devfreq.
> * @profile: device-specific devfreq profile
> * @governor: method how to choose frequency based on the usage.
> - * @governor_name: devfreq governor name for use with this devfreq
> * @nb: notifier block used to notify devfreq object that it should
> * reevaluate operable frequencies. Devfreq users may use
> * devfreq.nb to the corresponding register notifier call chain.
> @@ -176,7 +173,6 @@ struct devfreq {
> struct device dev;
> struct devfreq_dev_profile *profile;
> const struct devfreq_governor *governor;
> - char governor_name[DEVFREQ_NAME_LEN];
> struct notifier_block nb;
> struct delayed_work work;
>
>
Applied it.
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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