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

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Message-Id: <20110713150023.0dde9ef4.rdunlap@xenotime.net>
Date:	Wed, 13 Jul 2011 15:00:23 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Arnaud Lacombe <lacombar@...il.com>
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()

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.

How would you do it without (instead of) a kconfig fix/patch?

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


---
~Randy
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