linux-kernel - Re: [PATCH] dynamic_debug: Restore dev_dbg/netdev

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Message-Id: <20120725.171706.1150592587492146246.davem@davemloft.net>
Date:	Wed, 25 Jul 2012 17:17:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	joe@...ches.com
Cc:	gregkh@...uxfoundation.org, jbaron@...hat.com, kay@...y.org,
	jim.cromie@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] dynamic_debug: Restore dev_dbg/netdev_dbg
 functionality, reduce stack use

From: Joe Perches <joe@...ches.com>
Date: Wed, 25 Jul 2012 17:10:00 -0700

> commit c4e00daaa9 ("driver-core: extend dev_printk() to pass structured data")
> changed __dev_printk and broke dynamic-debug's ability to control the
> dynamic prefix of dev_dbg(dev,..).
> 
> dynamic_emit_prefix() adds "[tid] module:func:line:" to the output and
> those additions got lost.
> 
> In addition, the current dynamic debug code uses up to 3 recursion
> levels via %pV.  This can consume quite a bit of stack.  Directly
> call printk_emit to reduce the recursion by one depth.
> 
> These changes include:
> 
> o Remove KERN_DEBUG from dynamic_emit_prefix
> o Create and use function create_syslog_header to format the syslog
>   header for printk_emit uses.
> o Call create_syslog_header and neaten __dev_printk
> o Call create_syslog_header and printk_emit from dynamic_dev_dbg
> o Call create_syslog_header and printk_emit from dynamic_netdev_dbg
> o Make __dev_printk and __netdev_printk static not global
> o Remove include header declarations of __dev_printk and __netdev_printk
> o Remove now unused EXPORT_SYMBOL()s of __dev_printk and __netdev_printk
> o Whitespace neatening
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

For networking parts:

Acked-by: David S. Miller <davem@...emloft.net>
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