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