linux-kernel - Re: [PATCH 1/9] stringify: add HEX

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Date:	Wed, 13 Jul 2011 17:49:48 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-kbuild@...r.kernel.org,
	linux-media@...r.kernel.org, mchehab@...radead.org
Subject: Re: [PATCH 1/9] stringify: add HEX_STRING()

Hi,

On Sun, Jul 10, 2011 at 3:51 PM, Randy Dunlap <rdunlap@...otime.net> wrote:
> From: Randy Dunlap <rdunlap@...otime.net>
>
> Add HEX_STRING(value) to stringify.h so that drivers can
> convert kconfig hex values (without leading "0x") to useful
> hex constants.
>
> Several drivers/media/radio/ drivers need this.  I haven't
> checked if any other drivers need to do this.
>
> Alternatively, kconfig could produce hex config symbols with
> leading "0x".
>
Actually, I used to have a patch to make hex value have a mandatory
"0x" prefix, in the Kconfig. I even fixed all the issue in the tree,
it never make it to the tree (not sure why). Here's the relevant
thread:

https://patchwork.kernel.org/patch/380591/
https://patchwork.kernel.org/patch/380621/
https://patchwork.kernel.org/patch/380601/

 - Arnaud

> Signed-off-by: Randy Dunlap <rdunlap@...otime.net>
> ---
>  include/linux/stringify.h |    7 +++++++
>  1 file changed, 7 insertions(+)
>
> NOTE: The other 8 patches are on lkml and linux-media mailing lists.
>
> --- linux-next-20110707.orig/include/linux/stringify.h
> +++ linux-next-20110707/include/linux/stringify.h
> @@ -9,4 +9,11 @@
>  #define __stringify_1(x...)    #x
>  #define __stringify(x...)      __stringify_1(x)
>
> +/*
> + * HEX_STRING(value) is useful for CONFIG_ values that are in hex,
> + * but kconfig does not put a leading "0x" on them.
> + */
> +#define HEXSTRINGVALUE(h, value)       h##value
> +#define HEX_STRING(value)              HEXSTRINGVALUE(0x, value)
> +
that seems hackish...

>  #endif /* !__LINUX_STRINGIFY_H */
> --
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