linux-kernel - Re: [PATCH v2] kconfig: autogenerated config_is

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Message-ID: <20110513122112.GA469@elte.hu>
Date:	Fri, 13 May 2011 14:21:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Michal Marek <mmarek@...e.cz>,
	Arnaud Lacombe <lacombar@...il.com>,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	x86@...nel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2] kconfig: autogenerated config_is_xxx macro


* Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Fri, May 13, 2011 at 1:01 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com> wrote:
> >
> >> On 10:30 Fri 13 May     , Ingo Molnar wrote:
> >> >
> >> > * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com> wrote:
> >> >
> >> > > -#ifdef CONFIG_PCI_BIOS
> >> > > - if (!rt->signature) {
> >> > > + if (config_is_pci_bios() && !rt->signature) {
> >> >
> >> > Makes sense - but please name it in a more obvious way, such as:
> >> >
> >> >     pci_bios_enabled()
> >> the idea to generate the macro via Kconfig
> >
> > Okay, and there we are stuck with whatever the Kconfig name is. (we could
> > rename that but not needed really)
> >
> > Why not the canonical config_pci_bios() variant? It's the shortest one to
> > write. The '_is' looks pretty superfluous to me.
> >
> > Hm, i guess it could be mixed up with a function that configures the pci_bios.
> >
> > I guess since i don't have any better idea config_is_pci_bios() sounds like a
> > good choice after all.
> 
> But we don't name config options like CONFIG_IS_PCI_BIOS, do we?

The problem is that 'config' can be misunderstood as a verb - it's often used 
for function names to say 'to configure'.

By naming it 'config_is_()' it unambiguously becomes a noun.

Thanks,

	Ingo
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