powerpc/64: Disable irq restore warning for now

[Michael Ellerman]

On Tue, 2018-08-07 at 11:48:46 UTC, Michael Ellerman wrote:
> We recently added a warning in arch_local_irq_restore() to check that
> the soft masking state matches reality.
> 
> Unfortunately it trips in a few places, which are not entirely trivial
> to fix. The key problem is if we're doing function_graph tracing of
> restore_math(), the warning pops and then seems to recurse. It's not
> entirely clear because the system continuously oopses on all CPUs,
> with the output interleaved and unreadable.
> 
> It's also been observed on a G5 coming out of idle.
> 
> Until we can fix those cases disable the warning for now.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/4da1f79227ad42550e3e70e7b4812e

cheers