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

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Date:	Wed, 13 Jul 2011 18:06:15 -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 Wed, Jul 13, 2011 at 6:00 PM, Randy Dunlap <rdunlap@...otime.net> wrote:
> On Wed, 13 Jul 2011 17:49:48 -0400 Arnaud Lacombe wrote:
>
>> 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/
>>
>
> I prefer that this be fixed in kconfig, so long as it won't cause
> any other issues.  That's why I mentioned it.
>
>>
>> > 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...
>
> It's a common idiom for concatenating strings in the kernel.
>
I meant hackish not because *how* it is done, but because *why* it has
to be done, that is, because the Kconfig miss the prefix, which is
really no big deal.

> How would you do it without (instead of) a kconfig fix/patch?
>
have the Kconfig use the "0x" prefix since the beginning.

 - Arnaud

>> >  #endif /* !__LINUX_STRINGIFY_H */
>> > --
>
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>
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