linux-kernel - Re: [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler

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Date:   Tue, 7 Mar 2017 16:22:48 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Paolo Valente <paolo.valente@...aro.org>, Tejun Heo <tj@...nel.org>
Cc:     Fabio Checconi <fchecconi@...il.com>,
        Arianna Avanzini <avanzini.arianna@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ulf.hansson@...aro.org, linus.walleij@...aro.org,
        broonie@...nel.org
Subject: Re: [PATCH RFC 01/14] block, bfq: introduce the BFQ-v0 I/O scheduler
 as an extra scheduler

> +/**
> + * bfq_entity_of - get an entity from a node.
> + * @node: the node field of the entity.
> + *
> + * Convert a node pointer to the relative entity.  This is used only
> + * to simplify the logic of some functions and not as the generic
> + * conversion mechanism because, e.g., in the tree walking functions,
> + * the check for a %NULL value would be redundant.
> + */
> +static struct bfq_entity *bfq_entity_of(struct rb_node *node)
> +{
> +	struct bfq_entity *entity = NULL;
> +
> +	if (node)
> +		entity = rb_entry(node, struct bfq_entity, rb_node);
> +
> +	return entity;
> +}

Get rid of pointless wrappers like this, just use rb_entry() in the
caller. It's harmful to the readability of the code to have to lookup
things like this, if it's a list_entry or rb_entry() in the caller you
know exactly what is going on immediately.

-- 
Jens Axboe