Commit e209950fdd065d2cc46e6338e47e52841b830cba upstream.

Allow the way we access members of the processor vtable to be changed
at compile time.  We will need to move to per-CPU vtables to fix the
Spectre variant 2 issues on big.Little systems.

However, we have a couple of calls that do not need the vtable
treatment, and indeed cause a kernel warning due to the (later) use
of smp_processor_id(), so also introduce the PROC_TABLE macro for
these which always use CPU 0's function pointers.
Reviewed-by: NJulien Thierry <julien.thierry@arm.com>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: NDavid A. Long <dave.long@linaro.org>
Reviewed-by: NJulien Thierry <julien.thierry@arm.com>
Tested-by: NJulien Thierry <julien.thierry@arm.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>