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| author |   Oleg Nesterov <oleg@redhat.com> | 2013-11-12 15:10:01 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 12:09:23 +0900 |
| commit | 008208c6b26f21c2648c250a09c55e737c02c5f8 (patch) | |
| tree | 14710b8640457d3377b8ddc5d9ed5e41234ed561 /include/linux/list.h | |
| parent | sound/soc/pxa/mmp-pcm.c: use gen_pool_dma_alloc() to allocate dma buffer (diff) | |
| download | linux-dev-008208c6b26f21c2648c250a09c55e737c02c5f8.tar.xz linux-dev-008208c6b26f21c2648c250a09c55e737c02c5f8.zip | |
list: introduce list_next_entry() and list_prev_entry()
Add two trivial helpers list_next_entry() and list_prev_entry(), they
can have a lot of users including list.h itself. In fact the 1st one is
already defined in events/core.c and bnx2x_sp.c, so the patch simply
moves the definition to list.h.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/list.h')
| -rw-r--r-- | include/linux/list.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index f4d8a2f12a33..2ece63847001 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -373,6 +373,22 @@ static inline void list_splice_tail_init(struct list_head *list, (!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL) /** + * list_next_entry - get the next element in list + * @pos: the type * to cursor + * @member: the name of the list_struct within the struct. + */ +#define list_next_entry(pos, member) \ + list_entry((pos)->member.next, typeof(*(pos)), member) + +/** + * list_prev_entry - get the prev element in list + * @pos: the type * to cursor + * @member: the name of the list_struct within the struct. + */ +#define list_prev_entry(pos, member) \ + list_entry((pos)->member.prev, typeof(*(pos)), member) + +/** * list_for_each - iterate over a list * @pos: the &struct list_head to use as a loop cursor. * @head: the head for your list. |