linux-kernel - Re: [PATCH linux-next] lib: Kconfig: use bool instead of boolean

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Date:	Mon, 2 Feb 2015 18:12:13 -0500
From:	Christoph Jaeger <cj@...ux.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Yalin Wang <yalin.wang@...ymobile.com>,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH linux-next] lib: Kconfig: use bool instead of boolean

On Mon, Feb 02, 2015 at 02:27:32PM -0800, Andrew Morton wrote:
> On Mon,  2 Feb 2015 09:59:16 -0500 Christoph Jaeger <cj@...ux.com> wrote:
> 
> > Keyword 'boolean' for type definition attributes is considered
> > deprecated and, therefore, should not be used anymore.
> > 
> > See http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com
> > See http://lkml.kernel.org/r/1419108071-11607-1-git-send-email-cj@linux.com
> > 
> > ...
> >
> > --- a/lib/Kconfig
> > +++ b/lib/Kconfig
> > @@ -14,7 +14,7 @@ config BITREVERSE
> >  	tristate
> >  
> >  config HAVE_ARCH_BITREVERSE
> > -	boolean
> > +	bool
> >  	default n
> >  	depends on BITREVERSE
> >  	help
> 
> Your patch patches 556d2f055bf6d ("ARM: 8187/1: add
> CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction") which appears
> in linux-next via the ARM tree.

Oh, sorry, yes; it should be applied by the ARM folks to their tree then, of course.

Cheers,
Christoph

> There are many uses of "boolean" in lib/Kconfig.  Converting just one
> of them is inefficient and odd.
> 
> 556d2f055bf6d is a bit of a surprise.  It looks good to me from a
> non-ARM perspective - the __builtin_constant_p() optimisation is
> sensible, although bitrev on a constant probably isn't very common.
> 
> I'm not sure about the ARM part though!  __bitrev8() is pretty damn
> fast.  Presumably an inlined rbit instruction is faster still, but not
> very much?
> 
> The Kconfig help text in 556d2f055bf6d rather needs some caring for.
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