linux-kernel - [PATCH 1/8] liblockdep: Fix undefined symbol prandom

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Date:	Fri, 29 Jul 2016 23:02:12 -0400
From:	"Levin, Alexander" <alexander.levin@...izon.com>
To:	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ben Hutchings <ben@...adent.org.uk>,
	"Levin, Alexander" <alexander.levin@...izon.com>
Subject: [PATCH 1/8] liblockdep: Fix undefined symbol prandom_u32

From: Ben Hutchings <ben@...adent.org.uk>

__lock_pin_lock() now calls prandom_u32() which is not defined in
liblockdep.  __lock_pin_lock() and its caller lock_pin_lock() are dead
code in liblockdep, but we still need to provide a definition of
prandom_u32() in case lazy binding is disabled.

Fixes: e7904a28f533 ("locking/lockdep, sched/core: Implement a better ...")
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 tools/lib/lockdep/lockdep.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/lib/lockdep/lockdep.c b/tools/lib/lockdep/lockdep.c
index a0a2e3a..443acb1 100644
--- a/tools/lib/lockdep/lockdep.c
+++ b/tools/lib/lockdep/lockdep.c
@@ -1,8 +1,15 @@
 #include <linux/lockdep.h>
+#include <stdlib.h>
 
 /* Trivial API wrappers, we don't (yet) have RCU in user-space: */
 #define hlist_for_each_entry_rcu	hlist_for_each_entry
 #define hlist_add_head_rcu		hlist_add_head
 #define hlist_del_rcu			hlist_del
 
+u32 prandom_u32(void)
+{
+	/* Used only by lock_pin_lock() which is dead code */
+	abort();
+}
+
 #include "../../../kernel/locking/lockdep.c"
-- 
2.7.4