[PATCH] fix gcc4 warning in asm-ppc/time.h

[Paul Mackerras]

Andrew Morton writes:

> Do we really want to do this?  The above implies that mfspr(SPRN_PVR) will
> return the same value across the entire uptime of the kernel.  Is that
> true?

Yes, the PVR is the processor version register, and it would be quite
disturbing if the silicon changed underneath us. :)

> Why is this function paying with const anyway?

It seemed like a good idea at the time? :)

Paul.