linux-kernel - Re: [PATCH] usb: storage: make US_DEBUGPX print with LOGLEVEL

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Date:	Tue, 16 Feb 2016 16:40:52 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Victor Dodon <printesoi@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	Gwendal Grignou <gwendal@...omium.org>
Subject: Re: [PATCH] usb: storage: make US_DEBUGPX print with LOGLEVEL_DEBUG

On Tue, Feb 16, 2016 at 03:45:39PM -0800, Victor Dodon wrote:
> On Sun, Feb 14, 2016 at 05:20:21PM -0800, Greg Kroah-Hartman wrote:
> > On Wed, Feb 10, 2016 at 04:13:43PM -0800, Victor Dodon wrote:
> > > The US_DEBUGPX macro uses printk without specifying a kernel log level, so
> > > the default kernel log level is used, which may not match LOGLEVEL_DEBUG
> > > used in usb_stor_dbg. Use printk_emit with LOGLEVEL_DEBUG instead.
> > > 
> > > Signed-off-by: Victor Dodon <printesoi@...omium.org>
> > > ---
> > >  drivers/usb/storage/debug.h | 10 ++++++++--
> > >  1 file changed, 8 insertions(+), 2 deletions(-)
> > 
> > Can you just get rid of US_DEBUGPX() entirely please?  It shouldn't be
> > needed anymore, just use usb_stor_dbg() instead.
> 
> Using usb_stor_dbg() instead of US_DEBUGPX() in
> usb_stor_show_command() prints one byte per line with the full syslog
> header, like this:
> 
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876236] Command
> TEST_UNIT_READY (6 bytes)
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876242] bytes: 
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876249]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876255]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876261]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876267]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876273]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876279]  00
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876285]
> 
> instead of the desired:
> 
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876236] Command
> TEST_UNIT_READY (6 bytes)
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876242] bytes: 
> 7,0,Feb 16 14:30:41,ubuntu,kernel:,[  422.876249]  00 00 00 00 00 00
> 
> this is why I think the US_DEBUGPX() macro is still needed.

Nope, fix the call to use the proper printk % modifier instead and you
will be fine.  No need to keep reinventing the wheel, we have had
support for byte streams in messages for probably over a decade now...

Nice try though :)

thanks,

greg k-h