perf top: Fix zero or negative refresh delay
If perf top is executed with a zero value for the refresh rate, we get a division by zero exception while computing samples_per_sec. Also a zero refresh rate is not possible, neither do we want to accept negative values. [ Impact: fix division by zero in perf top ] Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1244223061-5399-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -693,6 +693,9 @@ int cmd_top(int argc, const char **argv, const char *prefix)
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event_id[0] = 0;
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}
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if (delay_secs < 1)
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delay_secs = 1;
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for (counter = 0; counter < nr_counters; counter++) {
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if (event_count[counter])
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continue;
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