Messages in this thread Patch in this message | | | From | Vineet Gupta <> | Subject | [RFC 2/2] perf/core: change errno for sampling event not supported in hardware | Date | Mon, 9 May 2016 15:07:40 +0530 |
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This allows userspace to identify this case specifically from the catch all error msg it prints currently.
This is an ABI change
Before ------- | # perf record ls | Error: | The sys_perf_event_open() syscall returned with 524 (Unknown error 524) | for event (cycles:ppp). | /bin/dmesg may provide additional information. | No CONFIG_PERF_EVENTS=y kernel support configured?
Now ------- | # perf record ls | Error: | PMU Hardware doesn't support sampling/overflow-interrupts.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 4e2ebf6f2f1f..41c5c7122987 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8435,7 +8435,7 @@ SYSCALL_DEFINE5(perf_event_open, if (is_sampling_event(event)) { if (event->pmu->capabilities & PERF_PMU_CAP_NO_INTERRUPT) { - err = -ENOTSUPP; + err = -EOPNOTSUPP; goto err_alloc; } } -- 2.5.0
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