[Cluster-devel] [PATCH RESEND dlm/next 1/2] dlm: remove usage of list iterator for list_add() after the loop body
Alexander Aring
aahringo at redhat.com
Wed Apr 6 18:05:30 UTC 2022
From: Jakob Koschel <jakobkoschel at gmail.com>
In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].
Before, the code implicitly used the head when no element was found
when using &pos->list. Since the new variable is only set if an
element was found, the list_add() is performed within the loop
and only done after the loop if it is done on the list head directly.
Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel at gmail.com>
Signed-off-by: Alexander Aring <aahringo at redhat.com>
---
fs/dlm/lock.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index f5330e58d1fc..20eca2261711 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -1321,13 +1321,17 @@ static inline void unhold_lkb(struct dlm_lkb *lkb)
static void lkb_add_ordered(struct list_head *new, struct list_head *head,
int mode)
{
- struct dlm_lkb *lkb = NULL;
+ struct dlm_lkb *lkb = NULL, *iter;
- list_for_each_entry(lkb, head, lkb_statequeue)
- if (lkb->lkb_rqmode < mode)
+ list_for_each_entry(iter, head, lkb_statequeue)
+ if (iter->lkb_rqmode < mode) {
+ lkb = iter;
+ list_add_tail(new, &iter->lkb_statequeue);
break;
+ }
- __list_add(new, lkb->lkb_statequeue.prev, &lkb->lkb_statequeue);
+ if (!lkb)
+ list_add_tail(new, head);
}
/* add/remove lkb to rsb's grant/convert/wait queue */
--
2.31.1
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