netdev - Re: [PATCH 01/12] lib: create common ascii hex array

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Date:	Tue, 13 May 2008 12:55:05 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Harvey Harrison <harvey.harrison@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide <linux-ide@...r.kernel.org>,
	linux-netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jeff Garzik <jeff@...zik.org>, Ingo Molnar <mingo@...e.hu>,
	Jason Wessel <jason.wessel@...driver.com>,
	David Howells <dhowells@...hat.com>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 01/12] lib: create common ascii hex array

On Mon, 12 May 2008, Harvey Harrison wrote:

> Add a common hex array in hexdump.c so everyone can use it.
> 
> Add a common hi/lo helper to avoid the shifting masking that is
> done to get the upper and lower nibbles of a byte value.
> 
> Pull the pack_hex_byte helper from kgdb as it is opencoded many
> places in the tree that will be consolidated.
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> ---
>  
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 4d46e29..792bf0a 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -276,7 +276,17 @@ extern void print_hex_dump(const char *level, const char *prefix_str,
>  				const void *buf, size_t len, bool ascii);
>  extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
>  			const void *buf, size_t len);
> -#define hex_asc(x)	"0123456789abcdef"[x]
> +
> +extern const char hex_asc[];
> +#define hex_asc_lo(x)	hex_asc[((x) & 0x0f)]
> +#define hex_asc_hi(x)	hex_asc[((x) & 0xf0) >> 4]
> +
> +static inline char *pack_hex_byte(char *buf, u8 byte)
> +{
> +	*buf++ = hex_asc_hi(byte);
> +	*buf++ = hex_asc_lo(byte);
> +	return buf;
> +}

Any idea how much this will bloat kernel once it has, lets say 100 
users? 5k, 10k?


-- 
 i.
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