linux-kernel - [RFC 11/60] locking/lockdep: Increase number of supported lockdep subclasses

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Date:   Fri,  7 Sep 2018 23:39:58 +0200
From:   Jan H. Schönherr <jschoenh@...zon.de>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Jan H. Schönherr <jschoenh@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [RFC 11/60] locking/lockdep: Increase number of supported lockdep subclasses

With coscheduling the number of required classes is twice the depth of
the scheduling domain hierarchy. For a 256 CPU system, there are eight
levels at most. Adjust the number of subclasses, so that lockdep can
still be used on such systems.

Signed-off-by: Jan H. Schönherr <jschoenh@...zon.de>
---
 include/linux/lockdep.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b0d0b51c4d85..d93a5ec3077f 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -17,7 +17,7 @@ struct lockdep_map;
 extern int prove_locking;
 extern int lock_stat;
 
-#define MAX_LOCKDEP_SUBCLASSES		8UL
+#define MAX_LOCKDEP_SUBCLASSES		16UL
 
 #include <linux/types.h>
 
-- 
2.9.3.1.gcba166c.dirty