[PATCH 1/7] liblockdep: Fix undefined symbol prandom_u32

[Ben Hutchings <ben@decadent.org.uk>]

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__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>
---
 tools/lib/lockdep/common.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/lib/lockdep/common.c b/tools/lib/lockdep/common.c
index d1c89cc06f5f..405c17667c4d 100644
--- a/tools/lib/lockdep/common.c
+++ b/tools/lib/lockdep/common.c
@@ -1,5 +1,6 @@
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdlib.h>
 #include <linux/compiler.h>
 #include <linux/lockdep.h>
 #include <unistd.h>
@@ -10,6 +11,11 @@ static __thread struct task_struct current_obj;
 /* lockdep wants these */
 bool debug_locks = true;
 bool debug_locks_silent;
+u32 prandom_u32(void)
+{
+	/* Used only by lock_pin_lock() which is dead code */
+	abort();
+}
 
 __attribute__((destructor)) static void liblockdep_exit(void)
 {


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