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

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Date:	Wed, 9 Jul 2014 22:39:30 +0200
From:	Marek Vasut <marex@...x.de>
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>,
	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 05:24:26 PM, 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.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  fs/seq_file.c            | 35 +++++++++++++++++++++++++++++++++++
>  include/linux/seq_file.h |  4 ++++
>  2 files changed, 39 insertions(+)
> 
> diff --git a/fs/seq_file.c b/fs/seq_file.c
> index 3857b72..fec4a6b 100644
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -12,6 +12,7 @@
>  #include <linux/slab.h>
>  #include <linux/cred.h>
>  #include <linux/mm.h>
> +#include <linux/printk.h>
> 
>  #include <asm/uaccess.h>
>  #include <asm/page.h>
> @@ -794,6 +795,40 @@ void seq_pad(struct seq_file *m, char c)
>  }
>  EXPORT_SYMBOL(seq_pad);
> 
> +/* Analogue of print_hex_dump() */
> +void seq_hex_dump(struct seq_file *m, const char *prefix_str, int
> prefix_type, +		  int rowsize, int groupsize, const void *buf, 
size_t len,
> +		  bool ascii)
> +{
> +	const u8 *ptr = buf;
> +	int i, linelen, remaining = len;
> +	unsigned char linebuf[32 * 3 + 2 + 32 + 1];
> +
> +	if (rowsize != 16 && rowsize != 32)
> +		rowsize = 16;
> +
> +	for (i = 0; i < len; i += rowsize) {
> +		linelen = min(remaining, rowsize);
> +		remaining -= rowsize;
> +
> +		hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
> +				   linebuf, sizeof(linebuf), ascii);
> +
> +		switch (prefix_type) {
> +		case DUMP_PREFIX_ADDRESS:
> +			seq_printf(m, "%s%p: %s\n", prefix_str, ptr + i, 
linebuf);
> +			break;
> +		case DUMP_PREFIX_OFFSET:
> +			seq_printf(m, "%s%.8x: %s\n", prefix_str, i, linebuf);
> +			break;
> +		default:
> +			seq_printf(m, "%s%s\n", prefix_str, linebuf);
> +			break;
> +		}
> +	}
> +}
> +EXPORT_SYMBOL(seq_hex_dump);

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() ?

Best regards,
--
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