From patchwork Mon Nov 25 06:57:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 11259885 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8D3B8138C for ; Mon, 25 Nov 2019 06:57:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EAC02082C for ; Mon, 25 Nov 2019 06:57:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665025; bh=dgmbdVph82qN1wa16cF6s2yHXttZdvsFBY+an8U/Rxc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RT/g7qFoQraYs5G7ZnrxGMMdbtNVqjov1oH4Ee3hdGLHGrEjpEp3byA6v6UkclT+c dGQrakEIuMjbB7J3a+HrkoqxYT0iROJNItKOE5VEDy7TBGaoQO0tjYNU+Cf6L4kDMy sx9N+cKNJMfdVqSuN+fNwYXGm/EKsCuhqFsT+VTE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727085AbfKYG5F (ORCPT ); Mon, 25 Nov 2019 01:57:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:60774 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725535AbfKYG5E (ORCPT ); Mon, 25 Nov 2019 01:57:04 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2A80120815; Mon, 25 Nov 2019 06:57:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665024; bh=dgmbdVph82qN1wa16cF6s2yHXttZdvsFBY+an8U/Rxc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+dAQjJcaFklVxATGpUw+HZd5eyyApBlQfsuIwSEBStw/YwUsuvWSGFKskl/dTDjQ 7zwJpCj47szY/fBjrwh/JPl4wLh8MBEu3JPj663fGff1Tr6g/wJKgPzzxa/lzQao9h lkkP2uyc9FI/yWQIiHGTiXSupukfmg14BMl8oGVU= From: Masami Hiramatsu To: Shuah Khan , Steven Rostedt Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUGFIX PATCH v3 1/4] selftests/ftrace: Fix to check the existence of set_ftrace_filter Date: Mon, 25 Nov 2019 15:57:00 +0900 Message-Id: <157466502067.21973.8795718044691377192.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157466501169.21973.31401747181477687.stgit@devnote2> References: <157466501169.21973.31401747181477687.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org If we run ftracetest on the kernel with CONFIG_DYNAMIC_FTRACE=n, there is no set_ftrace_filter and all test cases are failed, because reset_ftrace_filter returns an error. Let's check whether set_ftrace_filter exists and remove redundant set_ftrace_filter from initialize_ftrace(). Signed-off-by: Masami Hiramatsu --- tools/testing/selftests/ftrace/test.d/functions | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions index 86986c4bba54..19d288cdf336 100644 --- a/tools/testing/selftests/ftrace/test.d/functions +++ b/tools/testing/selftests/ftrace/test.d/functions @@ -46,6 +46,9 @@ reset_events_filter() { # reset all current setting filters } reset_ftrace_filter() { # reset all triggers in set_ftrace_filter + if [ ! -f set_ftrace_filter ]; then + return 0 + fi echo > set_ftrace_filter grep -v '^#' set_ftrace_filter | while read t; do tr=`echo $t | cut -d: -f2` @@ -93,7 +96,6 @@ initialize_ftrace() { # Reset ftrace to initial-state disable_events [ -f set_event_pid ] && echo > set_event_pid [ -f set_ftrace_pid ] && echo > set_ftrace_pid - [ -f set_ftrace_filter ] && echo | tee set_ftrace_* [ -f set_graph_function ] && echo | tee set_graph_* [ -f stack_trace_filter ] && echo > stack_trace_filter [ -f kprobe_events ] && echo > kprobe_events From patchwork Mon Nov 25 06:57:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 11259887 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 61B211390 for ; Mon, 25 Nov 2019 06:57:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4339120830 for ; Mon, 25 Nov 2019 06:57:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665034; bh=phZqQ51DaGnCQflW3J09B6LC13NsFK9mZ6NFiZrDYeo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Cp+vOSkiCpuQCLG1/0qcTtQUBeIIyPwUI9dHy83Ef3I6YiZa//0XIDR+9H83IEoF0 qkpzOpk0r50k9ifVFMKumthUJ00XM8rdVjP0yJ/4arVaXrDNHpF39Qd58/tTzdP0UF bW+cmAP3qMgoT97I/kg7be5wkEggjsk/0Wi39pq4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725793AbfKYG5O (ORCPT ); Mon, 25 Nov 2019 01:57:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:60996 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725535AbfKYG5N (ORCPT ); Mon, 25 Nov 2019 01:57:13 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DC40D2082C; Mon, 25 Nov 2019 06:57:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665032; bh=phZqQ51DaGnCQflW3J09B6LC13NsFK9mZ6NFiZrDYeo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bmquQkGM2cZp0gWEZo0b117rHYQbIjTbNiDKKJnZb/bOPdl4oieFOtrF6fZ3szRIJ RqSiPgKynnEwNCxc4WJ5k5LTOXc2eKnitdltPruX/36arDqtwProGpWkH6qCQNCeg6 jTWzVjbclfLwHW8QevYMpnVgt2nsWIhLJRS2xLO8= From: Masami Hiramatsu To: Shuah Khan , Steven Rostedt Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUGFIX PATCH v3 2/4] selftests/ftrace: Fix ftrace test cases to check unsupported Date: Mon, 25 Nov 2019 15:57:09 +0900 Message-Id: <157466502948.21973.11090994193254792649.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157466501169.21973.31401747181477687.stgit@devnote2> References: <157466501169.21973.31401747181477687.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Since dynamic function tracer can be disabled, set_ftrace_filter can be disappeared. Test cases which depends on it, must check whether the set_ftrace_filter exists or not before testing and if not, return as unsupported. Also, if the function tracer itself is disabled, we can not set "function" to current_tracer. Test cases must check it before testing, and return as unsupported. Signed-off-by: Masami Hiramatsu Reviewed-by: Steven Rostedt (VMware) --- .../ftrace/test.d/ftrace/func-filter-stacktrace.tc | 2 ++ .../selftests/ftrace/test.d/ftrace/func_cpumask.tc | 5 +++++ 2 files changed, 7 insertions(+) diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc index 36fb59f886ea..1a52f2883fe0 100644 --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc @@ -3,6 +3,8 @@ # description: ftrace - stacktrace filter command # flags: instance +[ ! -f set_ftrace_filter ] && exit_unsupported + echo _do_fork:stacktrace >> set_ftrace_filter grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc index 86a1f07ef2ca..7757b549f0b6 100644 --- a/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc @@ -15,6 +15,11 @@ if [ $NP -eq 1 ] ;then exit_unresolved fi +if ! grep -q function available_tracers ; then + echo "Function trace is not enabled" + exit_unsupported +fi + ORIG_CPUMASK=`cat tracing_cpumask` do_reset() { From patchwork Mon Nov 25 06:57:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 11259889 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DADA3138C for ; Mon, 25 Nov 2019 06:57:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBEB120830 for ; Mon, 25 Nov 2019 06:57:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665043; bh=7KhYAgodYyb0DXk6DOmo0km58xW1FsFbLoY4aD0xgA0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=N99I92g1Vi0JuoU4YHKHirdm7K99YElaerviaWUkB+0AOYXCtVruQav2PjbNBw50N wD6+YGzS2dsaPCt8hTvc7hRXnABl2/RgF8r5JBOym0kpMvfbTdCGu2OAdz2uAubvU6 vsgCwVozKtC6G04XoAaPthaOqQQeoTi65b3v+4Wg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725535AbfKYG5X (ORCPT ); Mon, 25 Nov 2019 01:57:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:32944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbfKYG5X (ORCPT ); Mon, 25 Nov 2019 01:57:23 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 169302082F; Mon, 25 Nov 2019 06:57:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665042; bh=7KhYAgodYyb0DXk6DOmo0km58xW1FsFbLoY4aD0xgA0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Kxya4WQVFYLqQcfCwOY1y5+r4YNTNRNu0M2tP7MzGCvURWbUTpPwWGhb5vMqGAmCQ O1kw9xp8IydAKOBYLgdOJErExulpVISkhGlLJoGftBNX/fJ1sxabeVW7po5MraqFs4 aSJDZZxPwGsI+e8o4qBze0WxsBblBmJnjgKyonOs= From: Masami Hiramatsu To: Shuah Khan , Steven Rostedt Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUGFIX PATCH v3 3/4] selftests/ftrace: Do not to use absolute debugfs path Date: Mon, 25 Nov 2019 15:57:18 +0900 Message-Id: <157466503844.21973.6712225084846523442.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157466501169.21973.31401747181477687.stgit@devnote2> References: <157466501169.21973.31401747181477687.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Use relative path to trigger file instead of absolute debugfs path, because if the user uses tracefs instead of debugfs, it can be mounted at /sys/kernel/tracing. Anyway, since the ftracetest is designed to be run at the tracing directory, user doesn't need to use absolute path. Signed-off-by: Masami Hiramatsu Reviewed-by: Steven Rostedt (VMware) --- .../inter-event/trigger-action-hist-xfail.tc | 4 ++-- .../inter-event/trigger-onchange-action-hist.tc | 2 +- .../inter-event/trigger-snapshot-action-hist.tc | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc index 1221240f8cf6..3f2aee115f6e 100644 --- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc @@ -21,10 +21,10 @@ grep -q "snapshot()" README || exit_unsupported # version issue echo "Test expected snapshot action failure" -echo 'hist:keys=comm:onmatch(sched.sched_wakeup).snapshot()' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail +echo 'hist:keys=comm:onmatch(sched.sched_wakeup).snapshot()' >> events/sched/sched_waking/trigger && exit_fail echo "Test expected save action failure" -echo 'hist:keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail +echo 'hist:keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)' >> events/sched/sched_waking/trigger && exit_fail exit_xfail diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onchange-action-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onchange-action-hist.tc index 064a284e4e75..c80007aa9f86 100644 --- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onchange-action-hist.tc +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onchange-action-hist.tc @@ -16,7 +16,7 @@ grep -q "onchange(var)" README || exit_unsupported # version issue echo "Test onchange action" -echo 'hist:keys=comm:newprio=prio:onchange($newprio).save(comm,prio) if comm=="ping"' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger +echo 'hist:keys=comm:newprio=prio:onchange($newprio).save(comm,prio) if comm=="ping"' >> events/sched/sched_waking/trigger ping $LOCALHOST -c 3 nice -n 1 ping $LOCALHOST -c 3 diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc index 18fff69fc433..f546c1b66a9b 100644 --- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc +++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-snapshot-action-hist.tc @@ -23,9 +23,9 @@ grep -q "snapshot()" README || exit_unsupported # version issue echo "Test snapshot action" -echo 1 > /sys/kernel/debug/tracing/events/sched/enable +echo 1 > events/sched/enable -echo 'hist:keys=comm:newprio=prio:onchange($newprio).save(comm,prio):onchange($newprio).snapshot() if comm=="ping"' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger +echo 'hist:keys=comm:newprio=prio:onchange($newprio).save(comm,prio):onchange($newprio).snapshot() if comm=="ping"' >> events/sched/sched_waking/trigger ping $LOCALHOST -c 3 nice -n 1 ping $LOCALHOST -c 3 From patchwork Mon Nov 25 06:57:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 11259891 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B4F80138C for ; Mon, 25 Nov 2019 06:57:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9532A20679 for ; Mon, 25 Nov 2019 06:57:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665051; bh=8NJZ4ecKYsAsn8f0rkIBPL4Q6ni1vDuY2huK9s6nGEQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vqxgPxbd9A8IqkZthyk8vGD87P1nvTf8yAq2aodyUQ/T2nWdt61Y+dt3qtpiXPx6w GDGTa1CqnXBbQwkXMW2M4fz/TyMnN4S6rLhWDPaS11pnPt7OLF05bJUjxzWple4WwO Hfiakv9BaA1oHln9rsgEnwS0xEtCQYJvBMRLAcuU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727173AbfKYG5b (ORCPT ); Mon, 25 Nov 2019 01:57:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:33144 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725823AbfKYG5b (ORCPT ); Mon, 25 Nov 2019 01:57:31 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8FE1520835; Mon, 25 Nov 2019 06:57:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574665050; bh=8NJZ4ecKYsAsn8f0rkIBPL4Q6ni1vDuY2huK9s6nGEQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EeXJIKBht3llg+C28rDTz8jf1qp+AoBfCKyJ+axwXorkOaaF3ZnVGhHXyjKygzTEr TuodLxfwRXh4cYSzZvozSpqng3uBTjkR4dyrrPXRuo77EOWzvLIV+VABq5cd4+KcMA S38BxMwnr/lM1kdgjNjjwnIzcBOgV3EC3MRsefu0= From: Masami Hiramatsu To: Shuah Khan , Steven Rostedt Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUGFIX PATCH v3 4/4] selftests/ftrace: Fix multiple kprobe testcase Date: Mon, 25 Nov 2019 15:57:27 +0900 Message-Id: <157466504736.21973.15722652829669648396.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157466501169.21973.31401747181477687.stgit@devnote2> References: <157466501169.21973.31401747181477687.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Fix multiple kprobe event testcase to work it correctly. There are 2 bugfixes. - Since `wc -l FILE` returns not only line number but also FILE filename, following "if" statement always failed. Fix this bug by replacing it with 'cat FILE | wc -l' - Since "while do-done loop" block with pipeline becomes a subshell, $N local variable is not update outside of the loop. Fix this bug by using actual target number (256) instead of $N. Signed-off-by: Masami Hiramatsu Reviewed-by: Steven Rostedt (VMware) --- .../ftrace/test.d/kprobe/multiple_kprobes.tc | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc index 5862eee91e1d..6e3dbe5f96b7 100644 --- a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc +++ b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc @@ -20,9 +20,9 @@ while read i; do test $N -eq 256 && break done -L=`wc -l kprobe_events` -if [ $L -ne $N ]; then - echo "The number of kprobes events ($L) is not $N" +L=`cat kprobe_events | wc -l` +if [ $L -ne 256 ]; then + echo "The number of kprobes events ($L) is not 256" exit_fail fi