linux-kernel - [PATCH 4/6] locking/lockdep: Avoid noinstr warning for DEBUG

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Message-ID: <20210106144017.652218215@infradead.org>
Date:   Wed, 06 Jan 2021 15:36:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        rdunlap@...radead.org, jpoimboe@...hat.com, sfr@...b.auug.org.au,
        tony.luck@...el.com
Subject: [PATCH 4/6] 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@...radead.org>
---
 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
 }