locking/lockdep: Hide unused 'class' variable

BugLink: https://bugs.launchpad.net/bugs/1839036
[ Upstream commit 68037aa78208f34bda4e5cd76c357f718b838cbb ]

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]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qian Cai <cai@lca.pw>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yuyang Du <duyuyang@gmail.com>
Cc: frederic@kernel.org
Fixes: 68d41d8c94a3 ("locking/lockdep: Fix lock used or unused stats error")
Link: https://lkml.kernel.org/r/20190715092809.736834-1-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c
index 71631bef0e84fe833a9f2f3515d7cfb73897aa85..8b2ef15e35524de63c6e6510d5cbe3f48859546d 100644 (file)
--- a/kernel/locking/lockdep_proc.c
+++ b/kernel/locking/lockdep_proc.c
@@ -224,7 +224,6 @@ 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,
@@ -235,6 +234,8 @@ 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)