linux-kernel - Re: uninline check

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Date:	Tue, 17 Jul 2007 22:31:08 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeff Dike <jdike@...toit.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>, jdike@...aya.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Russell King <rmk@....linux.org.uk>
Subject: Re: uninline check_signature()

On Tue, 17 Jul 2007, Linus Torvalds wrote:
> On Tue, 17 Jul 2007, Geert Uytterhoeven wrote:
> > M68k uses I/O memory for all I/O (hence it sets CONFIG_HAS_IOMEM), but
> > many m68k machines don't have PCI or ISA (hence it doesn't set
> > CONFIG_PCI resp. CONFIG_ISA).
> 
> It doesn't matter whether the machine has PCI or ISA. The only thing that 
> matters is whether the thing compiles (which in turn depends on whether it 
> has "readb()", which in turn is what HAS_IOMEM is all about).
> 
> So I do think that HAS_IOMEM is the right thing here.

Good, I guess then either I'll have to do something similar to what ARM does:

| #elif !defined(readb)
| 
| #define readb(c)                        (__readwrite_bug("readb"),0)
| #define readw(c)                        (__readwrite_bug("readw"),0)
| #define readl(c)                        (__readwrite_bug("readl"),0)
| #define writeb(v,c)                     __readwrite_bug("writeb")
| #define writew(v,c)                     __readwrite_bug("writew")
| #define writel(v,c)                     __readwrite_bug("writel")
| 
| #define check_signature(io,sig,len)     (0)
| 
| #endif  /* __mem_pci */

(but use the real BUG() instead, I don't think the above will still
 compile now check_signature() is out-of-line)

And we'll all live with a check_signature() in our kernel, which is used
only by a few legacy drivers that depend on ISA || PCI...

OR I'll have to disable HAS_IOMEM on m68k, and invent a new Kconfig
symbol for lots of other stuff that currently depends on HAS_IOMEM...

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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