linux-kernel - [PATCH] locking/lockdep: hide unused 'class' variable

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Date:   Mon, 15 Jul 2019 11:27:49 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Qian Cai <cai@....pw>,
        Yuyang Du <duyuyang@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>, frederic@...nel.org,
        Ingo Molnar <mingo@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        Waiman Long <longman@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] locking/lockdep: hide unused 'class' variable

The usage is now hidden in an #ifdef, so we need to move
the variable itself in there as well to avoid this warning:

kernel/locking/lockdep_proc.c:203:21: error: unused variable 'class' [-Werror,-Wunused-variable]

Fixes: 68d41d8c94a3 ("locking/lockdep: Fix lock used or unused stats error")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/locking/lockdep_proc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 65b6a1600c8f..bda006f8a88b 100644
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -200,7 +200,6 @@ static void lockdep_stats_debug_show(struct seq_file *m)
 
 static int lockdep_stats_show(struct seq_file *m, void *v)
 {
-	struct lock_class *class;
 	unsigned long nr_unused = 0, nr_uncategorized = 0,
 		      nr_irq_safe = 0, nr_irq_unsafe = 0,
 		      nr_softirq_safe = 0, nr_softirq_unsafe = 0,
@@ -211,6 +210,8 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
 		      sum_forward_deps = 0;
 
 #ifdef CONFIG_PROVE_LOCKING
+	struct lock_class *class;
+
 	list_for_each_entry(class, &all_lock_classes, lock_entry) {
 
 		if (class->usage_mask == 0)
-- 
2.20.0