On Monday 07 April 2008, Sergei Shtylyov wrote:
> Fix kernel oops due to machine check occuring in init_chipset_siimage() on PPC
> 44x platforms. These 32-bit CPUs have 36-bit physical address and PCI I/O and
> memory spaces are mapped beyond 4 GB; arch/ppc/ code has a fixup in ioremap()
> that creates an illusion of the PCI I/O and memory resources being mapped below
> 4 GB, while arch/powerpc/ code got rid of this fixup with PPC 44x having instead
> CONFIG_RESOURCES_64BIT=y -- this causes the resources to be truncated to 32-bit
> 'unsigned long' type in this driver, and so non-existant memory being ioremap'ed
> and then accessed...
>
> Thanks to Valentine Barshak for providing an initial patch and explanations.
>
> Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
applied and pushed to Linus, thanks!
I guess that it would be worth to audit the rest of IDE code for
pci_resource_{start,end}() vs 'unsigned long' occurences and fix them.
[ Even if they work at the moment they are just bugs waiting to happened
when we add support for some new platforms or rewrite the code... ]
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