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Commit 5908cdc8 authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

list: Introduce list_rotate_left() 



Bring a new list_rotate_left() helper that rotates a list to
the left. This is useful for codes that need to round roubin
elements which queue priority increases from tail to head.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
parent 889ff015

include/linux/list.h

+14 −0
Original line number Diff line number Diff line
@@ -205,6 +205,20 @@ static inline int list_empty_careful(const struct list_head *head) 
	return (next == head) && (next == head->prev);

}



/**

 * list_rotate_left - rotate the list to the left

 * @head: the head of the list

 */

static inline void list_rotate_left(struct list_head *head)

{

	struct list_head *first;



	if (!list_empty(head)) {

		first = head->next;

		list_move_tail(first, head);

	}

}



/**

 * list_is_singular - tests whether a list has just one entry.

 * @head: the list to test.