linux-kernel - Re: [git pull] generic bitops

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Message-Id: <1209076897.20088.2.camel@brick>
Date:	Thu, 24 Apr 2008 15:41:37 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander van Heukelum <heukelum@...lshack.com>
Subject: Re: [git pull] generic bitops

On Thu, 2008-04-24 at 15:14 -0700, Linus Torvalds wrote:
> 
> On Thu, 24 Apr 2008, Ingo Molnar wrote:
> >
> > this started out as improvements/generalizations to x86 bitops, but grew 
> > generic impact (and generic optimizations) as well, so it's offered as a 
> > separate tree.
> 
> Can you do the config thing differently?
> 
> > diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386
> > index e09edfa..49990ea 100644
> > --- a/arch/um/Kconfig.i386
> > +++ b/arch/um/Kconfig.i386
> > @@ -39,6 +39,14 @@ config ARCH_REUSE_HOST_VSYSCALL_AREA
> >  	bool
> >  	default y
> >  
> > +config GENERIC_FIND_FIRST_BIT
> > +	bool
> > +	default y
> > +
> > +config GENERIC_FIND_NEXT_BIT
> > +	bool
> > +	default y
> > +
> 
> .. because instead of having each architecture do these kinds of things, 
> we're trying to make the *generic* code (ie lib/Kconfig) do
> 
> 	config GENERIC_FIND_FIRST_BIT
> 		bool
> 		default n

config HAVE_GENERIC_FIND_FIRST_BIT
	def_bool n

(I know it defaults to n, but this pattern is becoming suggestive of
features that must be selected, in addition to the HAVE_ prefix)

Although I think for lib stuff, we may want to think about WANT_
prefixes to suggest you have to opt in.

Harvey

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