Re: [PATCH][PPC32[NEWBIE] enhancement to virt_to_bus/bus_to_virt (try 2)

[Paul Mackerras]

Linh Dang writes:

> In 2.6.9 on non-APUS ppc32 platforms, virt_to_bus() will just subtract
> KERNELBASE  from the the virtual address. bus_to_virt() will perform
> the reverse operation.
> 
> This patch will make virt_to_bus():
> 
>      - perform the current operation if the virtual address is between
>        KERNELBASE and ioremap_bot.

Why do you want to do this?  The only code that should be using
virt_to_bus or bus_to_virt is the DMA API code, and it's happy with
them the way they are.

> The patch also changes virt_to_phys()/phys_to_virt() in a similar way.

What do you want to use them for?  They are only for use in low-level
memory management code.

Paul.
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