Re: [PATCH] drm/i915/gt: make kobj attributes const

[Andrzej Hajda <andrzej.hajda@xxxxxxxxx>]

On 09.03.2023 09:16, Jani Nikula wrote:
> There's no need for any of these to be mutable, constify:
>
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000020 files.0
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000050 files.1
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 preempt_timeout_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 timeslice_duration_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 timeslice_duration_def
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 preempt_timeout_def
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 max_spin_def
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 stop_timeout_def
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 heartbeat_interval_def
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 name_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 class_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 inst_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 mmio_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 caps_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 all_caps_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 max_spin_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 stop_timeout_attr
> drivers/gpu/drm/i915/gt/sysfs_engines.o: .data	0000000000000038 heartbeat_interval_attr
>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>

There are more, dunno if all can be const:

$ git grep -c '^static struct kobj_attribute' -- drivers/gpu/drm/i915/
drivers/gpu/drm/i915/gt/intel_gt_sysfs.c:1
drivers/gpu/drm/i915/gt/intel_gt_sysfs_pm.c:3
drivers/gpu/drm/i915/gt/sysfs_engines.c:16

For this:
Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>

Regards
Andrzej


> ---
>   drivers/gpu/drm/i915/gt/sysfs_engines.c | 36 ++++++++++++-------------
>   1 file changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.c b/drivers/gpu/drm/i915/gt/sysfs_engines.c
> index 7eae3265f8cd..021f51d9b456 100644
> --- a/drivers/gpu/drm/i915/gt/sysfs_engines.c
> +++ b/drivers/gpu/drm/i915/gt/sysfs_engines.c
> @@ -27,7 +27,7 @@ name_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%s\n", kobj_to_engine(kobj)->name);
>   }
>   
> -static struct kobj_attribute name_attr =
> +static const struct kobj_attribute name_attr =
>   __ATTR(name, 0444, name_show, NULL);
>   
>   static ssize_t
> @@ -36,7 +36,7 @@ class_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%d\n", kobj_to_engine(kobj)->uabi_class);
>   }
>   
> -static struct kobj_attribute class_attr =
> +static const struct kobj_attribute class_attr =
>   __ATTR(class, 0444, class_show, NULL);
>   
>   static ssize_t
> @@ -45,7 +45,7 @@ inst_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%d\n", kobj_to_engine(kobj)->uabi_instance);
>   }
>   
> -static struct kobj_attribute inst_attr =
> +static const struct kobj_attribute inst_attr =
>   __ATTR(instance, 0444, inst_show, NULL);
>   
>   static ssize_t
> @@ -54,7 +54,7 @@ mmio_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "0x%x\n", kobj_to_engine(kobj)->mmio_base);
>   }
>   
> -static struct kobj_attribute mmio_attr =
> +static const struct kobj_attribute mmio_attr =
>   __ATTR(mmio_base, 0444, mmio_show, NULL);
>   
>   static const char * const vcs_caps[] = {
> @@ -125,7 +125,7 @@ caps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return __caps_show(engine, engine->uabi_capabilities, buf, true);
>   }
>   
> -static struct kobj_attribute caps_attr =
> +static const struct kobj_attribute caps_attr =
>   __ATTR(capabilities, 0444, caps_show, NULL);
>   
>   static ssize_t
> @@ -134,7 +134,7 @@ all_caps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return __caps_show(kobj_to_engine(kobj), -1, buf, false);
>   }
>   
> -static struct kobj_attribute all_caps_attr =
> +static const struct kobj_attribute all_caps_attr =
>   __ATTR(known_capabilities, 0444, all_caps_show, NULL);
>   
>   static ssize_t
> @@ -183,7 +183,7 @@ max_spin_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->props.max_busywait_duration_ns);
>   }
>   
> -static struct kobj_attribute max_spin_attr =
> +static const struct kobj_attribute max_spin_attr =
>   __ATTR(max_busywait_duration_ns, 0644, max_spin_show, max_spin_store);
>   
>   static ssize_t
> @@ -194,7 +194,7 @@ max_spin_default(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->defaults.max_busywait_duration_ns);
>   }
>   
> -static struct kobj_attribute max_spin_def =
> +static const struct kobj_attribute max_spin_def =
>   __ATTR(max_busywait_duration_ns, 0444, max_spin_default, NULL);
>   
>   static ssize_t
> @@ -237,7 +237,7 @@ timeslice_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->props.timeslice_duration_ms);
>   }
>   
> -static struct kobj_attribute timeslice_duration_attr =
> +static const struct kobj_attribute timeslice_duration_attr =
>   __ATTR(timeslice_duration_ms, 0644, timeslice_show, timeslice_store);
>   
>   static ssize_t
> @@ -248,7 +248,7 @@ timeslice_default(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->defaults.timeslice_duration_ms);
>   }
>   
> -static struct kobj_attribute timeslice_duration_def =
> +static const struct kobj_attribute timeslice_duration_def =
>   __ATTR(timeslice_duration_ms, 0444, timeslice_default, NULL);
>   
>   static ssize_t
> @@ -288,7 +288,7 @@ stop_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->props.stop_timeout_ms);
>   }
>   
> -static struct kobj_attribute stop_timeout_attr =
> +static const struct kobj_attribute stop_timeout_attr =
>   __ATTR(stop_timeout_ms, 0644, stop_show, stop_store);
>   
>   static ssize_t
> @@ -299,7 +299,7 @@ stop_default(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->defaults.stop_timeout_ms);
>   }
>   
> -static struct kobj_attribute stop_timeout_def =
> +static const struct kobj_attribute stop_timeout_def =
>   __ATTR(stop_timeout_ms, 0444, stop_default, NULL);
>   
>   static ssize_t
> @@ -344,7 +344,7 @@ preempt_timeout_show(struct kobject *kobj, struct kobj_attribute *attr,
>   	return sysfs_emit(buf, "%lu\n", engine->props.preempt_timeout_ms);
>   }
>   
> -static struct kobj_attribute preempt_timeout_attr =
> +static const struct kobj_attribute preempt_timeout_attr =
>   __ATTR(preempt_timeout_ms, 0644, preempt_timeout_show, preempt_timeout_store);
>   
>   static ssize_t
> @@ -356,7 +356,7 @@ preempt_timeout_default(struct kobject *kobj, struct kobj_attribute *attr,
>   	return sysfs_emit(buf, "%lu\n", engine->defaults.preempt_timeout_ms);
>   }
>   
> -static struct kobj_attribute preempt_timeout_def =
> +static const struct kobj_attribute preempt_timeout_def =
>   __ATTR(preempt_timeout_ms, 0444, preempt_timeout_default, NULL);
>   
>   static ssize_t
> @@ -400,7 +400,7 @@ heartbeat_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->props.heartbeat_interval_ms);
>   }
>   
> -static struct kobj_attribute heartbeat_interval_attr =
> +static const struct kobj_attribute heartbeat_interval_attr =
>   __ATTR(heartbeat_interval_ms, 0644, heartbeat_show, heartbeat_store);
>   
>   static ssize_t
> @@ -411,7 +411,7 @@ heartbeat_default(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
>   	return sysfs_emit(buf, "%lu\n", engine->defaults.heartbeat_interval_ms);
>   }
>   
> -static struct kobj_attribute heartbeat_interval_def =
> +static const struct kobj_attribute heartbeat_interval_def =
>   __ATTR(heartbeat_interval_ms, 0444, heartbeat_default, NULL);
>   
>   static void kobj_engine_release(struct kobject *kobj)
> @@ -447,7 +447,7 @@ kobj_engine(struct kobject *dir, struct intel_engine_cs *engine)
>   
>   static void add_defaults(struct kobj_engine *parent)
>   {
> -	static const struct attribute *files[] = {
> +	static const struct attribute * const files[] = {
>   		&max_spin_def.attr,
>   		&stop_timeout_def.attr,
>   #if CONFIG_DRM_I915_HEARTBEAT_INTERVAL
> @@ -483,7 +483,7 @@ static void add_defaults(struct kobj_engine *parent)
>   
>   void intel_engines_add_sysfs(struct drm_i915_private *i915)
>   {
> -	static const struct attribute *files[] = {
> +	static const struct attribute * const files[] = {
>   		&name_attr.attr,
>   		&class_attr.attr,
>   		&inst_attr.attr,