linux-kernel - [PATCH 1/1] percpu: resolve err may not be initialized in pcpu

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Date:   Wed, 21 Jun 2017 11:51:09 -0400
From:   Dennis Zhou <dennisz@...com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>, Tejun Heo <tj@...nel.org>
CC:     Christoph Lameter <cl@...ux-foundation.org>,
        Ingo Molnar <mingo@...e.hu>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] percpu: resolve err may not be initialized in pcpu_alloc

>From 4a42ecc735cff0015cc73c3d87edede631f4b885 Mon Sep 17 00:00:00 2001
From: Dennis Zhou <dennisz@...com>
Date: Wed, 21 Jun 2017 08:07:15 -0700

Add error message to out of space failure for atomic allocations in
percpu allocation path to fix -Wmaybe-uninitialized.

Signed-off-by: Dennis Zhou <dennisz@...com>
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 mm/percpu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index a5bc363..bd4130a 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -956,8 +956,10 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
 	 * tasks to create chunks simultaneously.  Serialize and create iff
 	 * there's still no empty chunk after grabbing the mutex.
 	 */
-	if (is_atomic)
+	if (is_atomic) {
+		err = "atomic alloc failed, no space left";
 		goto fail;
+	}
 
 	if (list_empty(&pcpu_slot[pcpu_nr_slots - 1])) {
 		chunk = pcpu_create_chunk();
-- 
2.9.3