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[PATCH 01/15] liblockdep: Fix undefined symbol prandom_u32

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From: Ben Hutchings <ben@decadent.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@decadent.org.uk>
Signed-off-by: Sasha Levin <sasha.levin@oracle.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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[PATCH 01/15] liblockdep: Fix undefined symbol prandom_u32 alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 02/15] liblockdep: Reduce MAX_LOCK_DEPTH to avoid overflowing  lock_chain::depth alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 10/15] tools: add install make target for liblockdep alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 12/15] tools: liblockdep: fix compilation for 4.11 alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 15/15] tools: liblockdep: Use LDFLAGS alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 08/15] liblockdep: Remove -lpthread compiler option alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 09/15] MAINTAINERS: update email for Sasha Levin alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 03/15] liblockdep: Define the ARRAY_SIZE() macro alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 14/15] tools: liblockdep: Remove double-quotes from soname alexander.levin@verizon.com - 2017-05-18 02:10 +0200
  [PATCH 04/15] liblockdep: Enable -Wall by default alexander.levin@verizon.com - 2017-05-18 02:20 +0200
  [PATCH 07/15] liblockdep: Fix 'defined but not used' warning for  init_utsname() alexander.levin@verizon.com - 2017-05-18 02:20 +0200
  [PATCH 13/15] tools: liblockdep: Fix object file paths used in an  out-of-tree build alexander.levin@verizon.com - 2017-05-18 02:20 +0200
  [PATCH 11/15] tools: liblockdep: Don't mix fd-based and stream IO alexander.levin@verizon.com - 2017-05-18 02:20 +0200
  [PATCH 06/15] liblockdep: Fix 'set but not used' warnings alexander.levin@verizon.com - 2017-05-18 02:20 +0200
  Re: [PATCH 01/15] liblockdep: Fix undefined symbol prandom_u32 Ingo Molnar <mingo@kernel.org> - 2017-05-24 10:00 +0200

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