> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 62715a5a4f32..8bc9d9b29fd3 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -486,6 +486,12 @@ extern unsigned int bvec_nr_vecs(unsigned short idx);
> extern const char *bio_devname(struct bio *bio, char *buffer);
>
> #define bio_set_dev(bio, bdev) \
> +do { \
> + bio_set_dev_only(bio, bdev); \
> + bio_associate_blkg(bio); \
> +} while (0)
> +
> +#define bio_set_dev_only(bio, bdev) \
This lacks any explanation on when you would use bio_set_dev_only or
bio_set_dev. Please document why we need both and why you'd choose or
the other.
