locking/lockdep: Avoid noinstr warning for DEBUG_LOCKDEP

  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@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210106144017.652218215@infradead.org

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 02bc5b8..bdaf482 100644 (file)
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -5271,12 +5271,15 @@ static void __lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie cookie
 /*
  * 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 flags)
 
        if (!debug_locks)
                print_irqtrace_events(current);
+
+       instrumentation_end();
 #endif
 }