linux-kernel - Re: [PATCH] pci: Fix bus resource assignment on 32 bits with 64b resources

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Date:	Thu, 6 Dec 2007 09:13:04 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Greg KH <greg@...ah.com>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pci: Fix bus resource assignment on 32 bits with 64b
 resources

On Thu, 6 Dec 2007, Benjamin Herrenschmidt wrote:
> On Wed, 2007-12-05 at 22:39 -0800, Greg KH wrote:
> > > that is  it can be either unsigned int, unsigned long or unsigned
> > long
> > > long... and we have no way to reliably printk that.
> > 
> > We do this already just fine.  Take a look in the kernel, I think we
> > just always cast it to long long to be uniform.
> 
> I wanted to avoid that for two reasons:
> 
>  - casts are fugly
>  - it adds support code to cast & handle 64 bits to 32 bits platforms
>    that wouldn't normally need it

Indeed. I still have a few places to fix it up in the Zorro bus code and
drivers. Everything is 32 bit, but allyesconfig sets CONFIG_RESOURCES_64BIT...
In some way I liked the recent suggestion to make CONFIG_RESOURCES_64BIT
depend on something...

> Now, if you really think that's the way to go, I'll respin with casts
> (I've used cast in subsequent patches merging bits & pieces of the
> powerpc 32 and 64 bits PCI code too in fact).

And casting to `unsigned long' for Zorro bus may sound fine, except what if
one day we'll need 64-bit resources for one platform?

> I was just hoping somebody had a better idea, like a way to add a new
> format specifier to printk without losing gcc type checking :-)

#define PRI* (...) ;-)

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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