From: David Gibson <david@gibson.dropbear.id.au>
Date: Sat, 13 Jun 2015 14:23:39 +0000 (+1000)
Subject: lstack: Allow a stack to be initialized from an existing top element
X-Git-Url: https://git.ozlabs.org/?a=commitdiff_plain;h=d448f12d07c5b65d5db29f207de3178490f8360d;hp=d448f12d07c5b65d5db29f207de3178490f8360d;p=ccan

lstack: Allow a stack to be initialized from an existing top element

There are occasional cases where you might construct a valid stack, and
retain a direct pointer to the top element, but not the struct lstack
used to build it.

This patch adds a new lstack_init_from_top() macro to reconstruct a valid
struct lstack from the element pointer for cases like this.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---