31 lines
1.0 KiB
Diff
31 lines
1.0 KiB
Diff
Subject: list-add-list-last-entry.patch
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From: Peter Zijlstra <peterz@infradead.org>
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Date: Tue, 21 Jun 2011 11:22:36 +0200
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.1-rt4.tar.xz
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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include/linux/list.h | 11 +++++++++++
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1 file changed, 11 insertions(+)
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--- a/include/linux/list.h
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+++ b/include/linux/list.h
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@@ -373,6 +373,17 @@ static inline void list_splice_tail_init
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(!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
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/**
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+ * list_last_entry - get the last element from a list
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+ * @ptr: the list head to take the element from.
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+ * @type: the type of the struct this is embedded in.
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+ * @member: the name of the list_struct within the struct.
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+ *
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+ * Note, that list is expected to be not empty.
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+ */
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+#define list_last_entry(ptr, type, member) \
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+ list_entry((ptr)->prev, type, member)
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+
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+/**
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* list_for_each - iterate over a list
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* @pos: the &struct list_head to use as a loop cursor.
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* @head: the head for your list.
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