From: Ben Hutchings Date: Tue, 14 Jun 2016 21:09:19 +0100 Subject: [PATCH 1/7] liblockdep: Fix undefined symbol prandom_u32 Forwarded: http://mid.gmane.org/20160614204713.GT7555@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 --- tools/lib/lockdep/common.c | 6 ++++++ 1 file changed, 6 insertions(+) --- 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"