linux-kernel - Re: [PATCH] staging: gdm72xx: conditionally compile debug code

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Date:	Wed, 16 Jul 2014 17:19:44 -0700
From:	Joe Perches <joe@...ches.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Michalis Pappas <mpappas@...tmail.fm>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: gdm72xx: conditionally compile debug code

On Wed, 2014-07-16 at 15:57 -0700, Greg KH wrote:
> On Wed, Jul 16, 2014 at 03:46:09PM -0700, Joe Perches wrote:
> > On Wed, 2014-07-16 at 15:10 -0700, Greg KH wrote:
> > > On Wed, Jul 16, 2014 at 11:03:06PM +0100, Michalis Pappas wrote:
> > []
> > > > Ok, I agree on the ifdef stuff. My question was regarding your
> > > > suggestion above to replace print_hex_debug() with dev_dbg()
> > > 
> > > You want the device name/id/label to show up as well, that is why you
> > > should use the dev_dbg() version, print_hex_dump() does not take a
> > > struct device *, so the user has no idea what device this data was
> > > coming from.
> > 
> > But Michalis could alway add something like:
> > 	dev_hex_dump()
> > and
> > 	dev_dbg_hex_dump()
> > 
> 
> With the built-in "hex dump primitive" in printk(), why would you want
> to do that?  You shouldn't be putting more than 64 bytes in a single
> printk message in a hex dump, if you want to do more, use debugfs.

%p*h doesn't also emit "ascii or dots" for one.
 
I agree %p*h should be preferred but people do
all sorts of strange things in debugging printks.


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