linux-kernel - Re: [RFC PATCH] lib/vsprintf.c: Simplify uuid

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Message-ID: <20150511165529.16509.qmail@ns.horizon.com>
Date:	11 May 2015 12:55:29 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	joe@...ches.com, linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, linux@...musvillemoes.dk
Subject: Re: [RFC PATCH] lib/vsprintf.c: Simplify uuid_string()

>From joe@...ches.com Mon May 11 16:49:27 2015
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Subject: Re: [RFC PATCH] lib/vsprintf.c: Simplify uuid_string()
From: Joe Perches <joe@...ches.com>
To: George Spelvin <linux@...izon.com>
Cc: linux@...musvillemoes.dk, linux-kernel@...r.kernel.org
Date: Mon, 11 May 2015 09:49:23 -0700
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On Mon, 2015-05-11 at 12:32 -0400, George Spelvin wrote:
> I suspect it's a speedup, but since this is not hot code, the important
> part is that it shrinks the function from 332 to 256 bytes.

Joe Perches <joe@...ches.com> wrote:
> shrinking code in vsprintf is always good
> ?
>		*p++ = hex[byte >> 4];
>		*p++ = hex[byte & 0x0f];

Arrgh!

Yes, I ran into that compile problem already.  I'd already made
that change (I'm not quite Linus; I do *compile* my untested patches
before posting them), but didn't commit it properly, and when I ran
format-patch... :-(

Since this seems to be a positive reaction, I'll put together a test
harmess and make a proper submission.
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