[PATCH 4/6] locking/lockdep: Avoid noinstr warning for DEBUG_LOCKDEP

[Peter Zijlstra]

  vmlinux.o: warning: objtool: lock_is_held_type()+0x60: call to check_flags.part.0() leaves .noinstr.text section

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 kernel/locking/lockdep.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -5271,12 +5271,15 @@ static void __lock_unpin_lock(struct loc
 /*
  * Check whether we follow the irq-flags state precisely:
  */
-static void check_flags(unsigned long flags)
+static noinstr void check_flags(unsigned long flags)
 {
 #if defined(CONFIG_PROVE_LOCKING) && defined(CONFIG_DEBUG_LOCKDEP)
 	if (!debug_locks)
 		return;
 
+	/* Get the warning out..  */
+	instrumentation_begin();
+
 	if (irqs_disabled_flags(flags)) {
 		if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled())) {
 			printk("possible reason: unannotated irqs-off.\n");
@@ -5304,6 +5307,8 @@ static void check_flags(unsigned long fl
 
 	if (!debug_locks)
 		print_irqtrace_events(current);
+
+	instrumentation_end();
 #endif
 }