linux-kernel - [PATCH] lockdep: Noinstr annotate warn_bogus_irq

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Date:   Tue, 9 Feb 2021 09:34:10 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH] lockdep: Noinstr annotate warn_bogus_irq_restore()


Subject: lockdep: Noinstr annotate warn_bogus_irq_restore()
From: Peter Zijlstra <peterz@...radead.org>
Date: Tue Feb 9 09:30:03 CET 2021

  vmlinux.o: warning: objtool: lock_is_held_type()+0x107: call to warn_bogus_irq_restore() leaves .noinstr.text section

As per the general rule that WARNs are allowed to violate noinstr to
get out, annotate it away.

Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration")
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 include/linux/irqflags.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -153,8 +153,11 @@ do {						\
 extern void warn_bogus_irq_restore(void);
 #define raw_check_bogus_irq_restore()			\
 	do {						\
-		if (unlikely(!arch_irqs_disabled()))	\
+		if (unlikely(!arch_irqs_disabled())) {	\
+			instrumentation_begin();	\
 			warn_bogus_irq_restore();	\
+			instrumentation_end();		\
+		}					\
 	} while (0)
 #else
 #define raw_check_bogus_irq_restore() do { } while (0)