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Message-ID: <20170525125225.5379-2-alexander.levin@verizon.com>
Date: Thu, 25 May 2017 12:51:12 +0000
From: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To: "mingo@...nel.org" <mingo@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"ben@...adent.org.uk" <ben@...adent.org.uk>,
"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"Sasha Levin" <sasha.levin@...cle.com>
Subject: [PATCH 01/21] 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 <sasha.levin@...cle.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 a0a2e3a266af..443acb11f907 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"
--
2.11.0
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