Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933420Ab3GZVOa (ORCPT ); Fri, 26 Jul 2013 17:14:30 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:57489 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932814Ab3GZVOX (ORCPT ); Fri, 26 Jul 2013 17:14:23 -0400 From: Cody P Schafer To: Andrew Morton Cc: LKML , Linux MM , David Woodhouse , Rik van Riel , Michel Lespinasse , Seth Jennings , Cody P Schafer Subject: [PATCH 2/5] rbtree: add rbtree_postorder_for_each_entry_safe() helper Date: Fri, 26 Jul 2013 14:13:40 -0700 Message-Id: <1374873223-25557-3-git-send-email-cody@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1374873223-25557-1-git-send-email-cody@linux.vnet.ibm.com> References: <1374873223-25557-1-git-send-email-cody@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13072621-7182-0000-0000-000007E1137E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1617 Lines: 44 Because deletion (of the entire tree) is a relatively common use of the rbtree_postorder iteration, and because doing it safely means fiddling with temporary storage, provide a helper to simplify postorder rbtree iteration. Signed-off-by: Cody P Schafer --- include/linux/rbtree.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index 2879e96..64ab98b 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -85,4 +85,21 @@ static inline void rb_link_node(struct rb_node * node, struct rb_node * parent, *rb_link = node; } +/** + * rbtree_postorder_for_each_entry_safe - iterate over rb_root in post order of + * given type safe against removal of rb_node entry + * + * @pos: the 'type *' to use as a loop cursor. + * @n: another 'type *' to use as temporary storage + * @root: 'rb_root *' of the rbtree. + * @field: the name of the rb_node field within 'type'. + */ +#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \ + for (pos = rb_entry(rb_first_postorder(root), typeof(*pos), field),\ + n = rb_entry(rb_next_postorder(&pos->field), \ + typeof(*pos), field); \ + &pos->field; \ + pos = n, \ + n = rb_entry(rb_next_postorder(&pos->field), typeof(*pos), field)) + #endif /* _LINUX_RBTREE_H */ -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/