linux-kernel - [PATCH v2] mm/percpu.c: print error message too if atomic alloc failed

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Message-Id: <20230728030255.8458-1-bhe@redhat.com>
Date:   Fri, 28 Jul 2023 11:02:55 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org, dennis@...nel.org
Cc:     linux-mm@...ck.org, Baoquan He <bhe@...hat.com>
Subject: [PATCH v2] mm/percpu.c: print error message too if atomic alloc failed

The variable 'err' is assgigned to an error message if atomic alloc
failed, while it has no chance to be printed if is_atomic is true.

Here change to print error message too if atomic alloc failed, while
avoid to call dump_stack() if that case.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
v1->v2:
 Fix the code bug in v1 pointed out by Dennis.

 mm/percpu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index 83fc47206680..bdca8ec33d49 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1890,13 +1890,15 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
 fail:
 	trace_percpu_alloc_percpu_fail(reserved, is_atomic, size, align);
 
-	if (!is_atomic && do_warn && warn_limit) {
+	if (do_warn && warn_limit) {
 		pr_warn("allocation failed, size=%zu align=%zu atomic=%d, %s\n",
 			size, align, is_atomic, err);
-		dump_stack();
+		if (!is_atomic)
+			dump_stack();
 		if (!--warn_limit)
 			pr_info("limit reached, disable warning\n");
 	}
+
 	if (is_atomic) {
 		/* see the flag handling in pcpu_balance_workfn() */
 		pcpu_atomic_alloc_failed = true;
-- 
2.34.1