linux-kernel - Re: [PATCH 2/2 v2] lib/vsprintf.c: Further simplify uuid

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Date:	Tue, 12 May 2015 13:26:50 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	"George Spelvin" <linux@...izon.com>
Cc:	joe@...ches.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] lib/vsprintf.c: Further simplify uuid_string()

On Tue, May 12 2015, "George Spelvin" <linux@...izon.com> wrote:

> Make the endianness permutation table do double duty by having it
> list not source offsets, but destination offsets.  Thus, it both puts
> the bytes in the right order and skips the hyphens.
>
> This further shrinks the code from 256 to 214 bytes.  Eliminating
> erratic branches probably helps speed, too.
>
> Signed-off-by: George Spelvin <linux@...izon.com>
> ---
>> These might be better with a little comment/explanation
>> of the values as output offsets for each index.
>
> Like this?  I had thought about it, and had decied not to change the
> existing lacomic code style, as it didn't seem any harder to understand
> than the original.  But I'm happy to add comments.
>

With or without comments and the microscopic nit below:

Acked-by: Rasmus Villemoes <linux@...musvillemoes.dk>

You may want/need to include Andrew Morton in the cc-list to get these
picked up.

>
>  lib/vsprintf.c | 32 ++++++++++++++------------------
>  1 file changed, 14 insertions(+), 18 deletions(-)
>
> +	/* Insert the fixed punctuation */
> +	uuid[23] = uuid[18] = uuid[13] = uuid[8] = '-';
> +	uuid[36] = 0;

I think '\0' is more common.

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