[PATCH] ARM: Correct WFE() in asm/spinlock.h for Thumb-2

[Russell King - ARM Linux]

On Wed, Feb 09, 2011 at 10:20:29AM -0000, Will Deacon wrote:
> > the WFE into the 4 bytes expected by ALT_SMP().  For safety, I write
> > it out explicitly: ALT_SMP("wfene", ...) would work sometimes but
> > might not work as expected if the previous instruction has an EQ or NE
> > condition, because then the assembler wouldn't need to insert an extra
> > IT when it generates its output...
> 
> That's really horrible! It might be worth commenting the explicit
> IT in your WFE macro to explain why we can't rely on the assembler
> to generate it for us.

Yes, it's really really horrible.  As I say, I think in future I'm just
going to stick to writing good ARM code and let others worry about how
to make it work properly on T2.