linux-kernel - Re: [PATCH] printk: fix pr_debug and pr

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Message-ID: <1449184412.17296.6.camel@perches.com>
Date:	Thu, 03 Dec 2015 15:13:32 -0800
From:	Joe Perches <joe@...ches.com>
To:	Aaron Conole <aconole@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: fix pr_debug and pr_devel to elide function
 calls

On Thu, 2015-12-03 at 17:45 -0500, Aaron Conole wrote:
> Currently, pr_debug and pr_devel will not elide function call arguments
> appearing in calls to no_printk for these macros. This is because all
> side effects must be honored before proceeding to the 0-value assignment
> in no_printk.
> 
> The behavior is contrary to documentation found in the CodingStyle and
> header file where these functions are declared. 
> 
> This patch corrects that behavior by shunting out the call to no_printk
> completely. The format string is still checked by gcc for correctness, but
> no code seems to be emitted in common cases.
> 
> fixes commit 5264f2f75d86 ("include/linux/printk.h: use and neaten
> no_printk")
> 

The same should/could probably be done for dev_dbg/dev_vdbg
and the netdev and netif variants.

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