From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx106.postini.com [74.125.245.106]) by kanga.kvack.org (Postfix) with SMTP id DB5C16B0081 for ; Mon, 29 Jul 2013 15:19:56 -0400 (EDT) Received: from /spool/local by e7.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 29 Jul 2013 15:19:55 -0400 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by d01dlp03.pok.ibm.com (Postfix) with ESMTP id 5BBDDC90043 for ; Mon, 29 Jul 2013 15:19:50 -0400 (EDT) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r6TJJnTH154840 for ; Mon, 29 Jul 2013 15:19:50 -0400 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r6TJJdx2004704 for ; Mon, 29 Jul 2013 13:19:39 -0600 From: Cody P Schafer Subject: [PATCH v2 2/5] rbtree: add rbtree_postorder_for_each_entry_safe() helper Date: Mon, 29 Jul 2013 12:19:27 -0700 Message-Id: <1375125570-9401-3-git-send-email-cody@linux.vnet.ibm.com> In-Reply-To: <1375125570-9401-1-git-send-email-cody@linux.vnet.ibm.com> References: <1375125570-9401-1-git-send-email-cody@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: LKML , Linux MM , David Woodhouse , Rik van Riel , Michel Lespinasse , Seth Jennings , Cody P Schafer 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 Reviewed-by: Seth Jennings --- include/linux/rbtree.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h index c467151..aa870a4 100644 --- a/include/linux/rbtree.h +++ b/include/linux/rbtree.h @@ -85,4 +85,22 @@ 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org