linux-kernel - Re: [PATCH v3 2/7] lib/hexdump.c: Relax rowsize checks in hex_dump_to

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Date:   Tue, 18 Jun 2019 10:57:00 +1000
From:   "Alastair D'Silva" <alastair@...ilva.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Karsten Keil <isdn@...ux-pingi.de>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Laight <David.Laight@...LAB.COM>,
        Andrew Morton <akpm@...ux-foundation.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fbdev@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 2/7] lib/hexdump.c: Relax rowsize checks in
 hex_dump_to_buffer

On Mon, 2019-06-17 at 15:47 -0700, Randy Dunlap wrote:
> Hi,
> Just a comment style nit below...
> 
> On 6/16/19 7:04 PM, Alastair D'Silva wrote:
> > From: Alastair D'Silva <alastair@...ilva.org>
> > 
> > This patch removes the hardcoded row limits and allows for
> > other lengths. These lengths must still be a multiple of
> > groupsize.
> > 
> > This allows structs that are not 16/32 bytes to display on
> > a single line.
> > 
> > This patch also expands the self-tests to test row sizes
> > up to 64 bytes (though they can now be arbitrarily long).
> > 
> > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> > ---
> >  lib/hexdump.c      | 48 ++++++++++++++++++++++++++++--------------
> >  lib/test_hexdump.c | 52 ++++++++++++++++++++++++++++++++++++++--
> > ------
> >  2 files changed, 75 insertions(+), 25 deletions(-)
> > 
> > diff --git a/lib/hexdump.c b/lib/hexdump.c
> > index 81b70ed37209..3943507bc0e9 100644
> > --- a/lib/hexdump.c
> > +++ b/lib/hexdump.c
> > @@ -246,17 +248,29 @@ void print_hex_dump(const char *level, const
> > char *prefix_str, int prefix_type,
> >  {
> >  	const u8 *ptr = buf;
> >  	int i, linelen, remaining = len;
> > -	unsigned char linebuf[32 * 3 + 2 + 32 + 1];
> > +	unsigned char *linebuf;
> > +	unsigned int linebuf_len;
> >  
> > -	if (rowsize != 16 && rowsize != 32)
> > -		rowsize = 16;
> > +	if (rowsize % groupsize)
> > +		rowsize -= rowsize % groupsize;
> > +
> > +	/* Worst case line length:
> > +	 * 2 hex chars + space per byte in, 2 spaces, 1 char per byte
> > in, NULL
> > +	 */
> 
> According to Documentation/process/coding-style.rst:
> 
> The preferred style for long (multi-line) comments is:
> 
> .. code-block:: c
> 
> 	/*
> 	 * This is the preferred style for multi-line
> 	 * comments in the Linux kernel source code.
> 	 * Please use it consistently.
> 	 *
> 	 * Description:  A column of asterisks on the left side,
> 	 * with beginning and ending almost-blank lines.
> 	 */
> 

Thanks Randy, I'll address this.


-- 
Alastair D'Silva           mob: 0423 762 819
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Twitter: @EvilDeece
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