powerpc/64: Fix watchdog configuration regressions

[Michael Ellerman]

On Mon, 2017-08-28 at 04:27:19 UTC, Nicholas Piggin wrote:
> This fixes a couple more bits of fallout from the new hard lockup watchdog
> patch.
> 
> It restores the required hw_nmi_get_sample_period() function for the
> perf watchdog, and removes some function declarations on 64e that are only
> defined for 64s. This fixes the 64e build when the hardlockup detector is
> enabled.
> 
> It restores the default behaviour of disabling the perf watchdog, and also
> fixes disabling the 64s watchdog when running as a guest.
> 
> Fixes: 2104180a53 ("powerpc/64s: implement arch-specific hardlockup watchdog")
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/70412c55d419e971785094e9f7880f

cheers