linux-kernel - [tip: x86/urgent] locking/lockdep: Avoid noinstr warning for DEBUG

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Date:   Tue, 12 Jan 2021 20:12:10 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] locking/lockdep: Avoid noinstr warning for DEBUG_LOCKDEP

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     77ca93a6b1223e210e58e1000c09d8d420403c94
Gitweb:        https://git.kernel.org/tip/77ca93a6b1223e210e58e1000c09d8d420403c94
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Wed, 06 Jan 2021 15:36:23 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 12 Jan 2021 21:10:59 +01:00

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

---
 kernel/locking/lockdep.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 02bc5b8..bdaf482 100644
--- 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
 }