linux-kernel - Re: [PATCH v3 1/4] lib/dlock-list: Distributed and lock-protected lists

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Date:	Tue, 19 Jul 2016 06:00:32 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Jan Kara <jack@...e.com>, Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Chinner <dchinner@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>
Subject: Re: [PATCH v3 1/4] lib/dlock-list: Distributed and lock-protected
 lists

On Fri, Jul 15, 2016 at 01:39:40PM -0400, Waiman Long wrote:

> +struct dlock_list_head_percpu {
> +	struct list_head list;
> +	spinlock_t lock;
> +};

> +#define DLOCK_LIST_HEAD_PERCPU_INIT(name)			\
> +	{							\
> +		.list.prev = &name.list,			\
> +		.list.next = &name.list,			\
> +		.list.lock = __SPIN_LOCK_UNLOCKED(name),	\

What's .list.lock and how does that even compile?

> +extern bool dlock_list_next(struct dlock_list_head *dlist,
> +			    struct dlock_list_iter *iter);

Ugh...  Why not dlist_for_each_entry(), seeing that all users end up with
the same boilerplate?