powerpc: Fix powerpc-specific watchdog build configuration
The powerpc kernel/watchdog.o should be built when HARDLOCKUP_DETECTOR and HAVE_HARDLOCKUP_DETECTOR_ARCH are both selected. If only the former is selected, then the generic perf watchdog has been selected. To simplify this check, introduce a new Kconfig symbol PPC_WATCHDOG that depends on both. This Kconfig option means the powerpc specific watchdog is enabled. Without this patch, Book3E will attempt to build the powerpc watchdog. Fixes: 2104180a ("powerpc/64s: implement arch-specific hardlockup watchdog") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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