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Commit05a4a95279("kernel/watchdog: split up config options") lost the perf-based hardlockup detector's dependency on PERF_EVENTS, which can result in broken builds with some powerpc configurations. Restore the dependency. Add it in for x86 too, despite x86 always selecting PERF_EVENTS it seems reasonable to make the dependency explicit. Link: http://lkml.kernel.org/r/20170810114452.6673-1-npiggin@gmail.com Fixes:05a4a95279("kernel/watchdog: split up config options") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>