From: "Luis R. Rodriguez" <lrodriguez@atheros•com>
To: Luis Rodriguez <Luis.Rodriguez@Atheros•com>
Cc: "Randy Dunlap" <randy.dunlap@oracle•com>,
"ath9k-devel@venema•h4ckr.net" <ath9k-devel@venema•h4ckr.net>,
"Jochen Voß" <jochen.voss@googlemail•com>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
"linux-wireless@vger•kernel.org" <linux-wireless@vger•kernel.org>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"linville@tuxdriver•com" <linville@tuxdriver•com>,
"torvalds@linux-foundation•org" <torvalds@linux-foundation•org>,
"Peter Zijlstra" <a.p.zijlstra@chello•nl>
Subject: Re: [PATCH 2/4] list.h: add list_cut_position()
Date: Wed, 6 Aug 2008 13:28:54 -0700 [thread overview]
Message-ID: <20080806202854.GP5605@tesla> (raw)
In-Reply-To: <20080806184520.GK5605@tesla>
On Wed, Aug 06, 2008 at 11:45:20AM -0700, Luis Rodriguez wrote:
>
> OK here's the new one.
> --
>
> This adds list_cut_position() which lets you cut a list into
> two lists given a pivot in the list.
>
> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros•com>
Here it is again but this time one which applies cleanly ontop of the
list_cut_tail() patch I just reposted.
--
list.h: add list_cut_position()
This adds list_cut_position() which lets you cut a list into
two lists given a pivot in the list.
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros•com>
---
include/linux/list.h | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+), 0 deletions(-)
diff --git a/include/linux/list.h b/include/linux/list.h
index 61034a6..78e5f1c 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -214,6 +214,46 @@ static inline int list_is_singular(const struct list_head *head)
return !list_empty(head) && (head->next == head->prev);
}
+static inline void __list_cut_position(struct list_head *list,
+ struct list_head *head, struct list_head *entry)
+{
+ struct list_head *new_first = entry->next;
+ list->next = head->next;
+ list->next->prev = list;
+ list->prev = entry;
+ entry->next = list;
+ head->next = new_first;
+ new_first->prev = head;
+}
+
+/**
+ * list_cut_position - cut a list into two
+ * @list: a new list to add all removed entries
+ * @head: a list with entries
+ * @entry: an entry within head, could be the head itself
+ * and if so we won't cut the list
+ *
+ * This helper moves the initial part of @head, up to and
+ * including @entry, from @head to @list. You should
+ * pass on @entry an element you know is on @head. @list
+ * should be an empty list or a list you do not care about
+ * losing its data.
+ *
+ */
+static inline void list_cut_position(struct list_head *list,
+ struct list_head *head, struct list_head *entry)
+{
+ if (list_empty(head))
+ return;
+ if (list_is_singular(head) &&
+ (head->next != entry && head != entry))
+ return;
+ if (entry == head)
+ INIT_LIST_HEAD(list);
+ else
+ __list_cut_position(list, head, entry);
+}
+
static inline void __list_splice(const struct list_head *list,
struct list_head *prev,
struct list_head *next)
--
1.5.6.rc2.15.g457bb.dirty
next prev parent reply other threads:[~2008-08-06 20:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-04 22:48 [PATCH 2/4] list.h: add list_cut_position() Luis R. Rodriguez
2008-08-04 23:00 ` Randy Dunlap
[not found] ` <20080804160011.ec964f1f.randy.dunlap-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2008-08-04 23:13 ` Luis R. Rodriguez
2008-08-05 8:52 ` Jochen Voß
2008-08-06 18:27 ` Luis R. Rodriguez
2008-08-06 18:35 ` Randy Dunlap
2008-08-06 18:45 ` Luis R. Rodriguez
2008-08-06 20:28 ` Luis R. Rodriguez [this message]
2008-08-06 20:32 ` Luis R. Rodriguez
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