Commit 0d2cc3b34532 ("locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING") moved the only usage of print_lock_trace() that was originally outside of the CONFIG_PROVE_LOCKING case. It moved that usage into a different case: CONFIG_PROVE_LOCKING && CONFIG_TRACE_IRQFLAGS. That leaves things not symmetrical, and as a result, the following warning fires on my build, when I have
!CONFIG_TRACE_IRQFLAGS && !CONFIG_PROVE_LOCKING set: kernel/locking/lockdep.c:2821:13: warning: ‘print_lock_trace’ defined but not used [-Wunused-function] Fix this by only defining print_lock_trace() in cases in which is it called. Fixes: 0d2cc3b34532 ("locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING") Cc: Frederic Weisbecker <frede...@kernel.org> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Will Deacon <will.dea...@arm.com> Signed-off-by: John Hubbard <jhubb...@nvidia.com> --- kernel/locking/lockdep.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index d06190fa5082..3065dc36c27a 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2817,11 +2817,14 @@ static inline int validate_chain(struct task_struct *curr, return 1; } +#if defined(CONFIG_TRACE_IRQFLAGS) static void print_lock_trace(struct lock_trace *trace, unsigned int spaces) { } #endif +#endif + /* * We are building curr_chain_key incrementally, so double-check * it from scratch, to make sure that it's done correctly: -- 2.21.0