llist: add interface to check if a node is on a list.

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With list.h lists, it is easy to test if a node is on a list, providing
it was initialised and that it is removed with list_del_init().

This patch provides similar functionality for llist.h lists.

 init_llist_node()
marks a node as being not-on-any-list be setting the ->next pointer to
the node itself.
 llist_on_list()
tests if the node is on any list.
 llist_del_first_init()
remove the first element from a llist, and marks it as being off-list.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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NeilBrown 2023-09-11 10:39:24 -04:00 • committed by Chuck Lever

parent 2b65a22684

commit d6b3358a28

1 changed files with 42 additions and 0 deletions

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include/linux/llist.h

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