Re: [PATCH v4 6/9] rbtree: Implement generic latch_tree

From: Linus Torvalds
Date: Thu Apr 09 2015 - 12:31:24 EST

On Thu, Apr 9, 2015 at 5:13 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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.

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