From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933206AbcE3LcZ (ORCPT ); Mon, 30 May 2016 07:32:25 -0400 Received: from smtprelay2.synopsys.com ([198.182.60.111]:58303 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933060AbcE3LcX (ORCPT ); Mon, 30 May 2016 07:32:23 -0400 From: Vineet Gupta To: CC: , , , , , , , Vineet Gupta Subject: [PATCH-REBASED 2/2] perf/core: change errno for sampling event not supported in hardware Date: Mon, 30 May 2016 17:01:46 +0530 Message-ID: <1464607906-16012-3-git-send-email-vgupta@synopsys.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1464607906-16012-1-git-send-email-vgupta@synopsys.com> References: <1464607906-16012-1-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.12.197.158] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 274450efea90..a156ec0cb420 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9271,7 +9271,7 @@ 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