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

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Date:	Tue, 4 Dec 2007 13:39:47 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Greg Kroah-Hartman <greg@...ah.com>, linuxppc-dev@...abs.org,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: Fix bus resource assignment on 32 bits with 64b
 resources

On Tue, 4 Dec 2007, Benjamin Herrenschmidt wrote:
> The current pci_assign_unassigned_resources() code doesn't work properly
> on 32 bits platforms with 64 bits resources. The main reason is the use
> of unsigned long in various places instead of resource_size_t.
> 
> This fixes it, along with some tricks to avoid casting to 64 bits on
> platforms that don't need it in every printk around.
> 
> This is a pre-requisite for making powerpc use the generic code instead of
> its own half-useful implementation.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
> 
>  drivers/pci/pci.h       |   11 +++++++++++
>  drivers/pci/setup-bus.c |   32 +++++++++++++++++---------------
>  drivers/pci/setup-res.c |    5 ++---
>  include/linux/pci.h     |    4 ++--
>  4 files changed, 32 insertions(+), 20 deletions(-)
> 
> Index: linux-work/drivers/pci/pci.h
> ===================================================================
> --- linux-work.orig/drivers/pci/pci.h	2007-12-04 17:00:43.000000000 +1100
> +++ linux-work/drivers/pci/pci.h	2007-12-04 17:02:11.000000000 +1100
> @@ -91,3 +91,14 @@ pci_match_one_device(const struct pci_de
>  }
>  
>  struct pci_dev *pci_find_upstream_pcie_bridge(struct pci_dev *pdev);
> +
> +#ifdef CONFIG_RESOURCES_64BIT
> +#define RESOURCE_ORDER(order)	(1ULL << (order))
> +#define RES_PR			"%016llx"
> +#else
> +#define RESOURCE_ORDER(order)	(1UL << (order))
> +#define RES_PR			"%08lx"
> +#endif
> +
> +#define RANGE_PR		RES_PR "-" RES_PR

Can we please have them in <linux/ioport.h>? They look very useful to me
elsewhere (other bus drivers, device drivers), too.

What about naming the printf format specifier macros more like in C99, e.g.
PRI*?

With kind regards,
 
Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
 
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