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

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Date:   Tue, 9 Feb 2021 13:24:30 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        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>
Subject: Re: [PATCH] lockdep: Noinstr annotate warn_bogus_irq_restore()

On Tue, Feb 09, 2021 at 09:34:10AM +0100, Peter Zijlstra wrote:
> 
> 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>

Whoops; sorry for missing that!

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
>  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)