linux-kernel - Re: [PATCH v3 1/5] seq_file: provide an analogue of print_hex

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Message-ID: <20140830225407.GF7996@ZenIV.linux.org.uk>
Date:	Sat, 30 Aug 2014 23:54:07 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	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>,
	linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
	Marek Vasut <marex@...x.de>
Subject: Re: [PATCH v3 1/5] seq_file: provide an analogue of print_hex_dump()

On Mon, Aug 25, 2014 at 12:03:11PM +0300, Andy Shevchenko wrote:
> The new seq_hex_dump() is a complete analogue of print_hex_dump().
> 
> We have few users of this functionality already. It allows to reduce their
> codebase.

I really don't like the stack footprint.

> +	unsigned char linebuf[32 * 3 + 2 + 32 + 1];

... and extra copying for no good reason.  Why not check that we have
enough space in buffer and generate directly into it?  See what e.g.
seq_escape() is doing...
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