From mboxrd@z Thu Jan  1 00:00:00 1970
From: Harvey Harrison <harvey.harrison@gmail.com>
Subject: Re: [PATCH 01/12] lib: create common ascii hex array
Date: Tue, 13 May 2008 09:53:27 -0700
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To: Ilpo =?ISO-8859-1?Q?J=E4rvinen?= <ilpo.jarvinen@helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, James Bottomley <James.Bottomley@HansenPartnership.com>, linux-scsi <linux-scsi@vger.kernel.org>, Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>, linux-ide <linux-ide@vger.kernel.org>, linux-netdev <netdev@vger.kernel.org>, David Miller <davem@davemloft.net>, Jeff Garzik <jeff@garzik.org>, Ingo Molnar <mingo@elte.hu>, Jason Wessel <jason.wessel@windriver.com>, David Howells <dhowells@redhat.com>, "ralf@linux-mips.org" <ralf@linux-mips.org>, Paul Mundt <lethal@linux-sh.org>, Paul Mackerras <paulus@samba.org>

On Tue, 2008-05-13 at 12:55 +0300, Ilpo J=C3=A4rvinen wrote:
> On Mon, 12 May 2008, Harvey Harrison wrote:
>=20
> > Add a common hex array in hexdump.c so everyone can use it.
> >=20
> > 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.
> >=20
> > Pull the pack_hex_byte helper from kgdb as it is opencoded many
> > places in the tree that will be consolidated.
> >=20
> > Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
> > ---
> > =20
> > -#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++ =3D hex_asc_hi(byte);
> > +	*buf++ =3D hex_asc_lo(byte);
> > +	return buf;
> > +}
>=20
> Any idea how much this will bloat kernel once it has, lets say 100=20
> users? 5k, 10k?
>=20

No more than the existing users do open-coding the same thing all over
the place.  If it becomes a problem, this can be out-of-lined, but
the savings are not much.

Harvey

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