From mboxrd@z Thu Jan 1 00:00:00 1970 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 Message-ID: <1462786660-2900-3-git-send-email-vgupta@synopsys.com> References: <1462786660-2900-1-git-send-email-vgupta@synopsys.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1462786660-2900-1-git-send-email-vgupta@synopsys.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+gla-linux-snps-arc=m.gmane.org@lists.infradead.org To: linux-perf-users@vger.kernel.org, peterz@infradead.org, acme@redhat.com Cc: vincent.weaver@maine.edu, linux-snps-arc@lists.infradead.org, Vineet Gupta , linux-kernel@vger.kernel.org, mingo@kernel.org List-Id: linux-perf-users.vger.kernel.org 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 --- 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