linux-kernel - Re: [Linaro-mm-sig] [PATCH 3/5] kobject: kset_uevent_ops: make filter() callback take a const *

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Date:   Mon, 21 Nov 2022 10:51:43 +0100
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org
Subject: Re: [Linaro-mm-sig] [PATCH 3/5] kobject: kset_uevent_ops: make
 filter() callback take a const *

Am 21.11.22 um 10:46 schrieb Greg Kroah-Hartman:
> The filter() callback in struct kset_uevent_ops does not modify the
> kobject passed into it, so make the pointer const to enforce this
> restriction.  When doing so, fix up all existing filter() callbacks to
> have the correct signature to preserve the build.
>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: "Christian König" <christian.koenig@....com>
> Cc: linux-media@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linaro-mm-sig@...ts.linaro.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Christian König <christian.koenig@....com> for the changes to 
the DMA-buf subsystem.

> ---
>   drivers/base/bus.c                    | 2 +-
>   drivers/base/core.c                   | 4 ++--
>   drivers/dma-buf/dma-buf-sysfs-stats.c | 2 +-
>   include/linux/kobject.h               | 2 +-
>   kernel/params.c                       | 2 +-
>   5 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> index 7ca47e5b3c1f..4ec6dbab73be 100644
> --- a/drivers/base/bus.c
> +++ b/drivers/base/bus.c
> @@ -163,7 +163,7 @@ static struct kobj_type bus_ktype = {
>   	.release	= bus_release,
>   };
>   
> -static int bus_uevent_filter(struct kobject *kobj)
> +static int bus_uevent_filter(const struct kobject *kobj)
>   {
>   	const struct kobj_type *ktype = get_ktype(kobj);
>   
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index a79b99ecf4d8..005a2b092f3e 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -2362,12 +2362,12 @@ static struct kobj_type device_ktype = {
>   };
>   
>   
> -static int dev_uevent_filter(struct kobject *kobj)
> +static int dev_uevent_filter(const struct kobject *kobj)
>   {
>   	const struct kobj_type *ktype = get_ktype(kobj);
>   
>   	if (ktype == &device_ktype) {
> -		struct device *dev = kobj_to_dev(kobj);
> +		const struct device *dev = kobj_to_dev(kobj);
>   		if (dev->bus)
>   			return 1;
>   		if (dev->class)
> diff --git a/drivers/dma-buf/dma-buf-sysfs-stats.c b/drivers/dma-buf/dma-buf-sysfs-stats.c
> index 2bba0babcb62..f69d68122b9b 100644
> --- a/drivers/dma-buf/dma-buf-sysfs-stats.c
> +++ b/drivers/dma-buf/dma-buf-sysfs-stats.c
> @@ -132,7 +132,7 @@ void dma_buf_stats_teardown(struct dma_buf *dmabuf)
>   
>   
>   /* Statistics files do not need to send uevents. */
> -static int dmabuf_sysfs_uevent_filter(struct kobject *kobj)
> +static int dmabuf_sysfs_uevent_filter(const struct kobject *kobj)
>   {
>   	return 0;
>   }
> diff --git a/include/linux/kobject.h b/include/linux/kobject.h
> index 5a2d58e10bf5..640f59d4b3de 100644
> --- a/include/linux/kobject.h
> +++ b/include/linux/kobject.h
> @@ -135,7 +135,7 @@ struct kobj_uevent_env {
>   };
>   
>   struct kset_uevent_ops {
> -	int (* const filter)(struct kobject *kobj);
> +	int (* const filter)(const struct kobject *kobj);
>   	const char *(* const name)(struct kobject *kobj);
>   	int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
>   };
> diff --git a/kernel/params.c b/kernel/params.c
> index 5b92310425c5..d2237209ceda 100644
> --- a/kernel/params.c
> +++ b/kernel/params.c
> @@ -926,7 +926,7 @@ static const struct sysfs_ops module_sysfs_ops = {
>   	.store = module_attr_store,
>   };
>   
> -static int uevent_filter(struct kobject *kobj)
> +static int uevent_filter(const struct kobject *kobj)
>   {
>   	const struct kobj_type *ktype = get_ktype(kobj);
>