linux-kernel - [PATCH net] lockdep: provide always true lockdep_is

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Date:	Fri,  8 Apr 2016 01:12:02 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>
Subject: [PATCH net] lockdep: provide always true lockdep_is_held stub if lockdep disabled

I need this to provide a generic lockdep_sock_is_held function which can
be easily used in the kernel without using ifdef PROVEN macros.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Miller <davem@...emloft.net>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
Hello Peter and Ingo,

if it is possible coud this go in via the net-tree, as this problem is
visible there already? Would be happy to get a review.

Thanks,
Hannes

 include/linux/lockdep.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index d026b190c53066..dc8d447cb3ab1c 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -428,6 +428,8 @@ struct lock_class_key { };
 #define lockdep_pin_lock(l)				do { (void)(l); } while (0)
 #define lockdep_unpin_lock(l)			do { (void)(l); } while (0)
 
+#define lockdep_is_held(l)			({ (void)(l); (1); })
+
 #endif /* !LOCKDEP */
 
 #ifdef CONFIG_LOCK_STAT
-- 
2.5.5