From 3752466b6bf04868296ac6bc27ea1765008636d8 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Thu, 25 May 2017 12:58:31 +0000 Subject: [PATCH] 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: Ben Hutchings Signed-off-by: Sasha Levin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: a.p.zijlstra@chello.nl Fixes: e7904a28f533 ("locking/lockdep, sched/core: Implement a better ...") Link: http://lkml.kernel.org/r/20170525130005.5947-2-alexander.levin@verizon.com Signed-off-by: Ingo Molnar --- 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 +#include /* 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" -- 2.20.1