linux-kernel - Re: [PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO

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Message-ID: <CAMuHMdXu2VJhB+1uFApeBrYS3t2cfpPMaTz12F=A_FNJB1Q60w@mail.gmail.com>
Date:	Tue, 13 Nov 2012 11:32:37 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org
Subject: Re: [PATCH] Centralise CONFIG_ARCH_NO_VIRT_TO_BUS

On Mon, Nov 12, 2012 at 10:26 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 366ec06..9bc00e7 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -271,6 +271,13 @@ config ARCH_WANT_OLD_COMPAT_IPC
>         select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
>         bool
>
> +config ARCH_NO_VIRT_TO_BUS
> +       bool
> +       help
> +         An architecture should select this if it cannot (or will not)
> +         implement virt_to_bus().  All new architectures should probably
> +         select this.

Don't we typically put the burden of selecting Kconfig flags for deprecated
features on the existing architectures that provide the deprecated features?

I.e. shouldn't it be ARCH_HAS_VIRT_TO_BUS, selected by the architectures
that need it, instead?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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