[PATCH 3/6] ARM: Fix v7wbi_tlb_flags for SMP on UP

[Catalin Marinas]

On Mon, 2010-09-06 at 16:34 +0100, Russell King - ARM Linux wrote:
> On Mon, Sep 06, 2010 at 12:46:34PM +0100, Catalin Marinas wrote:
> > Would this work with Thumb-2 kernel builds? Maybe you can add a W(instr)
> > in the SMP/UP macros to make sure that the instruction is always 32-bit
> > wide.
> 
> Probably not, and it's not obvious how to make it work for T2 kernel
> builds.  For the time being, I'm going to make this available only for
> native ARM builds.  We can think about how to make this work for T2
> sometime later.
[...]
> Indeed, that's only half of the problem.  On T2, some of these may be
> 16-bit values, others may be 32-bit values, and this mechanism has no
> way to know the size of the areas.

We can add the W() macro and they are guaranteed to be 32-bit wide or
get a compilation error. Something like using "UP(W(nop))", though it's
doesn't look as nice.

The usr_ret macro is always compiled to ARM mode anyway.

It may be easier to do it in this patch patch rather than at a later
time trying to grep for SMP/UP macros.

-- 
Catalin