Re: [RFC for-next v2 3/4] block/bio: add pcpu caching for non-polling bio_put

[Christoph Hellwig]

> +	unsigned long flags;
>  
>  	cache = per_cpu_ptr(bio->bi_pool->cache, get_cpu());
>  	bio_uninit(bio);
> @@ -737,12 +776,15 @@ static inline void bio_put_percpu_cache(struct bio *bio)
>  		cache->free_list = bio;
>  		cache->nr++;
>  	} else {
> -		put_cpu();
> -		bio_free(bio);
> -		return;
> +		local_irq_save(flags);
> +		bio->bi_next = cache->free_list_irq;
> +		cache->free_list_irq = bio;
> +		cache->nr_irq++;
> +		local_irq_restore(flags);
>  	}

Ok, I guess with that my previous comments don't make quite
as much sense any more.  I think youcan keep flags local in
the branch here, though.