linux-kernel - Re: [PATCH v1 1/5] seq_file: provide an analogue of print_hex

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201407100958.02218.marex@denx.de>
Date:	Thu, 10 Jul 2014 09:58:02 +0200
From:	Marek Vasut <marex@...x.de>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tadeusz Struk <tadeusz.struk@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Helge Deller <deller@....de>,
	Ingo Tuchscherer <ingo.tuchscherer@...ibm.com>,
	linux390@...ibm.com, Alexander Viro <viro@...iv.linux.org.uk>,
	qat-linux@...el.com, linux-crypto@...r.kernel.org,
	linux-media@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/5] seq_file: provide an analogue of print_hex_dump()

On Wednesday, July 09, 2014 at 11:21:08 PM, Joe Perches wrote:
> On Wed, 2014-07-09 at 22:39 +0200, Marek Vasut wrote:
> > The above function looks like almost verbatim copy of print_hex_dump().
> > The only difference I can spot is that it's calling seq_printf() instead
> > of printk(). Can you not instead generalize print_hex_dump() and based
> > on it's invocation, make it call either seq_printf() or printk() ?
> 
> How do you propose doing that given any seq_<foo> call
> requires a struct seq_file * and print_hex_dump needs
> a KERN_<LEVEL>.

I can imagine a rather nasty way, I can't say I would like it myself tho. The 
general idea would be to pull out the entire switch {} statement into a separate 
functions , one for printk() and one for seq_printf() cases. Then, have a 
generic do_hex_dump() call which would take as an argument a pointer to either 
of those functions and a void * to either the seq_file or level . Finally, there 
would have to be a wrapper to call the do_hex_dump() with the correct function 
pointer and it's associated arg.

Nasty? Yes ... Ineffective? Most likely.

> Is there an actual value to it?

Reducing the code duplication, but I wonder if there is a smarter solution than 
the horrid one above.

Best regards,
Marek Vasut
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/