linux-kernel - Re: [PATCH v4 6/9] rbtree: Implement generic latch

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Message-ID: <CA+55aFzL+0wDKev7ZWWMZVfr5ofcX=1qyCFkwMehC4ti0=C0CQ@mail.gmail.com>
Date:	Thu, 9 Apr 2015 09:31:16 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michel Lespinasse <walken@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v4 6/9] rbtree: Implement generic latch_tree

On Thu, Apr 9, 2015 at 5:13 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
>  struct latch_tree_node {
> +       struct rb_node node[2];
>  };
>
> +static __always_inline struct latch_tree_node *
> +__lt_from_rb(struct rb_node *node, int idx)
> +{
> +       return container_of(node, struct latch_tree_node, node[idx]);
> +}

Ugh. That syntax of offset_of() worries me a bit, but some grepping
shows that we already use this form of offset_of() in parts of the
kernel, so I guess it's fine.

Even with that small "Ugh", I do have to admit to preferring this to
having the back-pointer.

                        Linus
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