Re: [PATCH v1 1/5] seq_file: provide an analogue of print_hex_dump()

From: Marek Vasut
Date: Thu Jul 10 2014 - 05:41:45 EST

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

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
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