Oleg Nesterov 515619f209 uprobes/perf: Avoid perf_trace_buf_prepare/submit if ->perf_events is empty ...

perf_trace_buf_prepare() + perf_trace_buf_submit() make no sense
if this task/CPU has no active counters. Change uprobe_perf_print()
to return if hlist_empty(call->perf_events).

Note: this is not uprobe-specific, we can change other users too.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>

2013-04-15 17:39:52 +02:00

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