linux-kernel - Re: [PATCH 2/6] lightnvm: pblk: reduce arguments in __pblk_rb_update

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Date:   Mon, 2 Oct 2017 13:32:57 +0200
From:   Javier González <jg@...htnvm.io>
To:     Rakesh Pandit <rakesh@...era.com>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] lightnvm: pblk: reduce arguments in
 __pblk_rb_update_l2p

> On 1 Oct 2017, at 15.23, Rakesh Pandit <rakesh@...era.com> wrote:
> 
> We already pass the structure pointer so no need to pass the member.
> 
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>
> ---
> drivers/lightnvm/pblk-rb.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/lightnvm/pblk-rb.c b/drivers/lightnvm/pblk-rb.c
> index 05e6b2e..920ffac 100644
> --- a/drivers/lightnvm/pblk-rb.c
> +++ b/drivers/lightnvm/pblk-rb.c
> @@ -201,9 +201,9 @@ unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int nr_entries)
> 	return subm;
> }
> 
> -static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd,
> -				unsigned int to_update)
> +static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int to_update)
> {
> +	unsigned int l2p_update = rb->l2p_update;
> 	struct pblk *pblk = container_of(rb, struct pblk, rwb);
> 	struct pblk_line *line;
> 	struct pblk_rb_entry *entry;
> @@ -213,7 +213,7 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd,
> 	int flags;
> 
> 	for (i = 0; i < to_update; i++) {
> -		entry = &rb->entries[*l2p_upd];
> +		entry = &rb->entries[l2p_update];
> 		w_ctx = &entry->w_ctx;
> 
> 		flags = READ_ONCE(entry->w_ctx.flags);
> @@ -230,7 +230,7 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd,
> 		line = &pblk->lines[pblk_tgt_ppa_to_line(w_ctx->ppa)];
> 		kref_put(&line->ref, pblk_line_put);
> 		clean_wctx(w_ctx);
> -		*l2p_upd = (*l2p_upd + 1) & (rb->nr_entries - 1);
> +		rb->l2p_update = (l2p_update + 1) & (rb->nr_entries - 1);
> 	}
> 
> 	pblk_rl_out(&pblk->rl, user_io, gc_io);
> @@ -258,7 +258,7 @@ static int pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int nr_entries,
> 
> 	count = nr_entries - space;
> 	/* l2p_update used exclusively under rb->w_lock */
> -	ret = __pblk_rb_update_l2p(rb, &rb->l2p_update, count);
> +	ret = __pblk_rb_update_l2p(rb, count);
> 
> out:
> 	return ret;
> @@ -280,7 +280,7 @@ void pblk_rb_sync_l2p(struct pblk_rb *rb)
> 	sync = smp_load_acquire(&rb->sync);
> 
> 	to_update = pblk_rb_ring_count(sync, rb->l2p_update, rb->nr_entries);
> -	__pblk_rb_update_l2p(rb, &rb->l2p_update, to_update);
> +	__pblk_rb_update_l2p(rb, to_update);
> 
> 	spin_unlock(&rb->w_lock);
> }
> --
> 2.7.4

This in inherited from the time when the buffer pointers where kept in a
separate structure. While they are kept in struct pblk_rb, this is a
good cleanup.

Reviewed-by: Javier González <javier@...xlabs.com>


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