perf top: Default to system wide using perf_target methods
Additionally we were not checking if a cpu list had been provided by the user. Fix that. Reported-by: David Ahern <dsahern@gmail.com> Reported-by: Namhyung Kim <namhyung@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-ao3zrouylwmt7h9ikj0krubi@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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