Re: [PATCH] kobject: introduce kobject_del_and_put()

Greg Kroah-Hartman
2023-03-19T07:59:11Z

On Sun, Mar 19, 2023 at 04:16:39AM +0800, Yangtao Li wrote:
> There are plenty of using kobject_del() and kobject_put() together
> in the kernel tree. This patch wraps these two calls in a single helper.
>
> Signed-off-by: Yangtao Li <frank.li@vivo.com>
> ---
> include/linux/kobject.h | 1 +
> lib/kobject.c | 17 +++++++++++++++--
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/kobject.h b/include/linux/kobject.h
> index bdab370a24f4..782d4bd119f8 100644
> --- a/include/linux/kobject.h
> +++ b/include/linux/kobject.h
> @@ -111,6 +111,7 @@ extern struct kobject *kobject_get(struct kobject *kobj);
> extern struct kobject * __must_check kobject_get_unless_zero(
> struct kobject *kobj);
> extern void kobject_put(struct kobject *kobj);
> +extern void kobject_del_and_put(struct kobject *kobj);
>
> extern const void *kobject_namespace(const struct kobject *kobj);
> extern void kobject_get_ownership(const struct kobject *kobj,
> diff --git a/lib/kobject.c b/lib/kobject.c
> index 6e2f0bee3560..8c0293e37214 100644
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -731,6 +731,20 @@ void kobject_put(struct kobject *kobj)
> }
> EXPORT_SYMBOL(kobject_put);
>
> +/**
> + * kobject_del_and_put() - Delete kobject.
> + * @kobj: object.
> + *
> + * Unlink kobject from hierarchy and decrement the refcount.
> + * If refcount is 0, call kobject_cleanup().
> + */
> +void kobject_del_and_put(struct kobject *kobj)
> +{
> + kobject_del(kobj);
> + kobject_put(kobj);
> +}
> +EXPORT_SYMBOL_GPL(kobject_del_and_put);

We can't add exports or new functions like this without real users at
the same time, otherwise the export will quickly be removed.

So can you submit this as part of a patch series that actually uses it
so we can see if it's really even needed?

thanks,

greg k-h