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<linux/list.h>: Introduce the list_for_each_reverse() method

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The list_head counterpart of list_for_each_entry_reverse() was missing,
add it to complete the list handling APIs in <linux/list.h>.

[ This new API is also relied on by a WIP scheduler patch, so this
  variant is not a theoretical possibility only. ]

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Ingo Molnar 2023-09-21 11:32:58 +02:00
parent 1632d47fae
commit 8bf0cdfac7
1 changed files with 8 additions and 0 deletions
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8
include/linux/list.h
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@ -686,6 +686,14 @@ static inline void list_splice_tail_init(struct list_head *list,
#define list_for_each(pos, head) \
for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next)
/**
* list_for_each_reverse - iterate backwards over a list
* @pos: the &struct list_head to use as a loop cursor.
* @head: the head for your list.
*/
#define list_for_each_reverse(pos, head) \
for (pos = (head)->prev; pos != (head); pos = pos->prev)
/**
* list_for_each_rcu - Iterate over a list in an RCU-safe fashion
* @pos: the &struct list_head to use as a loop cursor.