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SubjectRe: [PATCH 1/2] kobject: don't delay to cleanup module kobject
On Fri, Nov 05, 2021 at 02:37:09PM +0800, Ming Lei wrote:
> CONFIG_DEBUG_KOBJECT_RELEASE is used for debugging kobject release/cleanup
> issue. The module kobject is released after module_exit() returns. If
> this kobject is delayed too much, and may cause other kobject's
> cleaned up a bit earlier before freeing module, then real issue is
> hidden.
>
> So don't delay module kobject's cleanup, meantime module kobject is
> always cleaned up synchronously, and we needn't module kobject's
> cleanup.
>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
> lib/kobject.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/lib/kobject.c b/lib/kobject.c
> index ea53b30cf483..4c0dbe11be3d 100644
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -16,6 +16,7 @@
> #include <linux/stat.h>
> #include <linux/slab.h>
> #include <linux/random.h>
> +#include <linux/module.h>
>
> /**
> * kobject_namespace() - Return @kobj's namespace tag.
> @@ -727,6 +728,10 @@ static void kobject_release(struct kref *kref)
> struct kobject *kobj = container_of(kref, struct kobject, kref);
> #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
> unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
> +
> + if (kobj->ktype == &module_ktype)
> + delay = 0;

No, there should not be anything "special" about module kobjects to get
this kind of treatment. They should work like any other kobject and
clean up properly when needed.

thanks,

greg k-h

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