From nobody Fri Dec 27 15:03:44 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3C9819D084; Fri, 29 Nov 2024 16:48:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732898914; cv=none; b=r+eJygqowudkHDW2jrqIfqwYIgcgDJg0/M3YFC5XImwbrqLRqe4Ti2gyj+rIf3UW3KbVoo61JiMkeAb1qrJvELNuv4vfRWorQDsdEp4wsQ98Q4/E/DeDTefbdk9I2WsD+UcnmObS0sBaE8gqL2iDvFzPP/WDNRKG9OaMAnc8AM4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732898914; c=relaxed/simple; bh=WFkIPpXulUXbAywnDNU8HT3l+4sMs3bGc3TO2sEeTkY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=BbdgR6lE1ctGBA2uSy0BOG+udVMtzL/Z9LfIb/TnGdfTtbDf5vFHbJaGv5ejgcNhBkaxBq+LHTBzBDOMjTTYhIHpeXcw2PgzjItx9xxH6OhQ8ld0SNItfVbEGXT7PQ3qSzBOdASQzG/9dZh0RfGt4lx8puwfTwS0zSDmyBLZmZU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qi4/eRSy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qi4/eRSy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F022AC4CECF; Fri, 29 Nov 2024 16:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732898914; bh=WFkIPpXulUXbAywnDNU8HT3l+4sMs3bGc3TO2sEeTkY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qi4/eRSy/UFINbJk3GZv08ieXTkR4Z7ysx1ZF5yGNSTdhtwH3mrzzDp7PLtLM6KEn vmt7/VfYHa1Kx3YjbO8sCRApT9HaG/6uZd4YtuW6o0UKPkKL7m//e3sTSubfwYZFgl 5O9bHvC8L1lgJ/Gcc1E0mmfYSWHX0Ev64v+lDE0KAYA8jY2gWS1mXDhnMbuoin+IXk tc+CRWcJz2kYoz0VVxFZWDKNXYlqjBo2rhJVEDNtotkajtwdIXcT5Dvblfe0rg3rIK Hed/YC41bSIM3/nNh+qq5/kVlSQFNXV/5GlRvs6qEO0DtZQsIHt/0jRCf5a7zWIL51 jaYgj41tGIZ1g== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Naveen N Rao Cc: Anil S Keshavamurthy , Masami Hiramatsu , "David S . Miller" , Mathieu Desnoyers , Oleg Nesterov , Tzvetomir Stoyanov , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v2 5/6] tracing/eprobe: Adopt guard() and scoped_guard() Date: Sat, 30 Nov 2024 01:48:30 +0900 Message-ID: <173289890996.73724.17421347964110362029.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173289885627.73724.13632317993038475335.stgit@devnote2> References: <173289885627.73724.13632317993038475335.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) Use guard() or scoped_guard() in eprobe events for critical sections rather than discrete lock/unlock pairs. Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_eprobe.c | 36 +++++++++++++++++------------------- 1 file changed, 17 insertions(+), 19 deletions(-) diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c index be8be0c1aaf0..82fd637cfc19 100644 --- a/kernel/trace/trace_eprobe.c +++ b/kernel/trace/trace_eprobe.c @@ -917,10 +917,10 @@ static int __trace_eprobe_create(int argc, const char= *argv[]) goto error; } =20 - mutex_lock(&event_mutex); - event_call =3D find_and_get_event(sys_name, sys_event); - ep =3D alloc_event_probe(group, event, event_call, argc - 2); - mutex_unlock(&event_mutex); + scoped_guard(mutex, &event_mutex) { + event_call =3D find_and_get_event(sys_name, sys_event); + ep =3D alloc_event_probe(group, event, event_call, argc - 2); + } =20 if (IS_ERR(ep)) { ret =3D PTR_ERR(ep); @@ -952,23 +952,21 @@ static int __trace_eprobe_create(int argc, const char= *argv[]) if (ret < 0) goto error; init_trace_eprobe_call(ep); - mutex_lock(&event_mutex); - ret =3D trace_probe_register_event_call(&ep->tp); - if (ret) { - if (ret =3D=3D -EEXIST) { - trace_probe_log_set_index(0); - trace_probe_log_err(0, EVENT_EXIST); + scoped_guard(mutex, &event_mutex) { + ret =3D trace_probe_register_event_call(&ep->tp); + if (ret) { + if (ret =3D=3D -EEXIST) { + trace_probe_log_set_index(0); + trace_probe_log_err(0, EVENT_EXIST); + } + goto error; + } + ret =3D dyn_event_add(&ep->devent, &ep->tp.event->call); + if (ret < 0) { + trace_probe_unregister_event_call(&ep->tp); + goto error; } - mutex_unlock(&event_mutex); - goto error; - } - ret =3D dyn_event_add(&ep->devent, &ep->tp.event->call); - if (ret < 0) { - trace_probe_unregister_event_call(&ep->tp); - mutex_unlock(&event_mutex); - goto error; } - mutex_unlock(&event_mutex); return ret; parse_error: ret =3D -EINVAL;