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Commit 3752466b authored by Ben Hutchings's avatar Ben Hutchings Committed by Ingo Molnar
Browse files

tools/lib/lockdep: Fix undefined symbol prandom_u32 



__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.

Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: a.p.zijlstra@chello.nl
Fixes: e7904a28 ("locking/lockdep, sched/core: Implement a better ...")
Link: http://lkml.kernel.org/r/20170525130005.5947-2-alexander.levin@verizon.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 3c2993b8

tools/lib/lockdep/lockdep.c

+7 −0
Original line number Diff line number Diff line 
#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"