powerpc/watchdog: Do not backtrace locked CPUs twice if allcpus backtrace is enabled
If sysctl_hardlockup_all_cpu_backtrace is enabled, there is no need to IPI stuck CPUs for backtrace before trigger_allbutself_cpu_backtrace(), which does the same thing again. Signed-off-by: NNicholas Piggin <npiggin@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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