linux-kernel - Re: [PATCH v2] dynamic_debug: Restore dev

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Date:	Thu, 02 Aug 2012 10:02:20 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jason Baron <jbaron@...hat.com>,
	Jim Cromie <jim.cromie@...il.com>, Kay Sievers <kay@...y.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] dynamic_debug: Restore dev_dbg functionality,
 optimize stack

On Tue, 2012-07-31 at 14:55 -0700, Andrew Morton wrote:
> On Sat, 28 Jul 2012 00:55:07 -0700
> Joe Perches <joe@...ches.com> wrote:
> 
> > 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 depth.
[]
> > Changes in v2:
> > 
> > o Fix dynamic_emit_prefix to always initialize output
> > o Call create_syslog_header and emit_printk from__netdev_printk and
> >   eliminate call to dev_printk to remove another recursion via %pV
> 
> This one causes an oops-on-boot
> (http://ozlabs.org/~akpm/stuff/IMG_20120731_144047.jpg).  v1 didn't do
> that.
> 
> config: http://ozlabs.org/~akpm/stuff/config-akpm2
> 

Thanks.  I'll fix it when I can.
Expect a week or so delay though.

I'm a bit busy on other projects and this one seems to
require additional testing.

cheers, Joe

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