linux-kernel - Re: [PATCH v3 3/7] lib/hexdump.c: Optionally suppress lines of repeated bytes

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Message-ID: <da2ff58290c4b6f08eb5ac25c288bdd03b5688f7.camel@d-silva.org>
Date:   Mon, 17 Jun 2019 14:07:12 +1000
From:   "Alastair D'Silva" <alastair@...ilva.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     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 3/7] lib/hexdump.c: Optionally suppress lines of
 repeated bytes

On Mon, 2019-06-17 at 12:04 +1000, Alastair D'Silva wrote:
> From: Alastair D'Silva <alastair@...ilva.org>
> 
> Some buffers may only be partially filled with useful data, while the
> rest
> is padded (typically with 0x00 or 0xff).
> 
> This patch introduces a flag to allow the supression of lines of
> repeated
> bytes, which are replaced with '** Skipped %u bytes of value 0x%x **'
> 
> An inline wrapper function is provided for backwards compatibility
> with
> existing code, which maintains the original behaviour.
> 
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> ---
>  include/linux/printk.h | 25 +++++++++---
>  lib/hexdump.c          | 91 ++++++++++++++++++++++++++++++++++++--
> ----
>  2 files changed, 99 insertions(+), 17 deletions(-)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index cefd374c47b1..d7754799cfe0 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -481,13 +481,18 @@ enum {
>  	DUMP_PREFIX_ADDRESS,
>  	DUMP_PREFIX_OFFSET
>  };
> +
>  extern int hex_dump_to_buffer(const void *buf, size_t len, int
> rowsize,
>  			      int groupsize, char *linebuf, size_t
> linebuflen,
>  			      bool ascii);
> +
> +#define HEXDUMP_ASCII			BIT(0)
> +#define HEXDUMP_SUPPRESS_REPEATED	BIT(1)
> +

This is missing the include of linux/bits.h, I'll fix this in the next
version.

-- 
Alastair D'Silva           mob: 0423 762 819
skype: alastair_dsilva    
Twitter: @EvilDeece
blog: http://alastair.d-silva.org