linux-kernel - Re: [PATCH 05/22] linux/printk.h: use DYNAMIC_DEBUG_BRANCH in pr_debug

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Date:   Thu, 27 Sep 2018 09:52:20 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Jason Baron <jbaron@...mai.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 05/22] linux/printk.h: use DYNAMIC_DEBUG_BRANCH in
 pr_debug_ratelimited

On Thu 2018-09-20 00:04:27, Rasmus Villemoes wrote:
> pr_debug_ratelimited tests the dynamic debug descriptor the old-fashioned
> way, and doesn't utilize the static key/jump label implementation on
> architectures that HAVE_JUMP_LABEL. Use the DYNAMIC_DEBUG_BRANCH which
> is defined appropriately.
> 
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>

Acked-by: Petr Mladek <pmladek@...e.com>

It is an independent fix. I am going to take it via printk.git
unless anyone is against it.

Best Regards,
Petr

> ---
>  include/linux/printk.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index cf3eccfe1543..d3ba3245531d 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -466,7 +466,7 @@ do {									\
>  				      DEFAULT_RATELIMIT_INTERVAL,	\
>  				      DEFAULT_RATELIMIT_BURST);		\
>  	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt));		\
> -	if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&	\
> +	if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\
>  	    __ratelimit(&_rs))						\
>  		__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__);	\
>  } while (0)
> -- 
> 2.16.4
>