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authorVineet Gupta <Vineet.Gupta1@synopsys.com>2016-05-09 15:07:40 +0530
committerIngo Molnar <mingo@kernel.org>2016-06-03 09:40:42 +0200
commita1396555abff9ff9b74c2e4da13e27e81fd094b2 (patch)
tree6110fe9ba57f3c7f8ad4bbf07138705bde694a6e /kernel/events
parenta54fa07930c0f7db55ecb4cc16b86d74101332c0 (diff)
downloadlinux-a1396555abff9ff9b74c2e4da13e27e81fd094b2.tar.bz2
perf/abi: Change the errno for sampling event not supported in hardware
Change the return code for sampling event not supported from -ENOTSUPP to -EOPNOTSUPP. This allows userspace to identify this case specifically, instead of printing the catch-all error message it did previously. Technically this is an ABI change, but we think we can get away with it. Old behavior: ------- | # 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? New behavior: ------- | # perf record ls | Error: | PMU Hardware doesn't support sampling/overflow-interrupts. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <acme@redhat.com> Cc: <linux-snps-arc@lists.infradead.org> Cc: <vincent.weaver@maine.edu> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Link: http://lkml.kernel.org/r/1462786660-2900-3-git-send-email-vgupta@synopsys.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f94f164b5054..5d48306879d5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9309,7 +9309,7 @@ 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;
}
}