[PATCH 1/4] ARM: runtime patching of __virt_to_phys() and __phys_to_virt()

Nicolas Pitre nico at fluxnic.net
Tue Jan 4 13:33:05 EST 2011

On Tue, 4 Jan 2011, David Brown wrote:

> On Tue, Jan 04 2011, Russell King - ARM Linux wrote:
> > On Tue, Jan 04, 2011 at 12:50:28PM -0500, Nicolas Pitre wrote:
> > You're making a mountain out of a mole hill.  At present, there is one
> > platform which defines its own complex v:p mapping and that is Realview,
> > but only when sparsemem is enabled.  As already mentioned, MSM is the
> > only other platform which can't use this method.  So that's a simple
> > dependency line against the config.
> This is unfortunate, however, for us, since it would keep us having all
> of our targets having to be built exclusively.
> Any idea how much it would hurt other targets to have the
> __virt_to_phys() and __phys_to_virt() have a 16-bit fixup, even if only
> the upper 8 bits are used?

Probably not that much.  But let's make it work satisfactorily for the 
general case first, and then we might consider and test variations that 
could accommodate msm.


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