linux-kernel - [PATCH v2 2/8] mm/percpu: use list_first_entry_or_null in pcpu_reclaim

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Date:   Tue, 25 Oct 2022 11:11:45 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: [PATCH v2 2/8] mm/percpu: use list_first_entry_or_null in
 pcpu_reclaim_populated()

To replace list_empty()/list_first_entry() pair to simplify code.

Signed-off-by: Baoquan He <bhe@...hat.com>
Acked-by: Dennis Zhou <dennis@...nel.org>
---
v1->v2:
- Add parentheses around assignment in the while condition. This mutes
  the lkp warning.

 mm/percpu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index 26d8cd2ca323..841bb93aaae6 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -2143,9 +2143,9 @@ static void pcpu_reclaim_populated(void)
 	 * other accessor is the free path which only returns area back to the
 	 * allocator not touching the populated bitmap.
 	 */
-	while (!list_empty(&pcpu_chunk_lists[pcpu_to_depopulate_slot])) {
-		chunk = list_first_entry(&pcpu_chunk_lists[pcpu_to_depopulate_slot],
-					 struct pcpu_chunk, list);
+	while ((chunk = list_first_entry_or_null(
+			&pcpu_chunk_lists[pcpu_to_depopulate_slot],
+			struct pcpu_chunk, list))) {
 		WARN_ON(chunk->immutable);
 
 		/*
-- 
2.34.1