From nobody Tue Feb 10 19:50:22 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 4CF6934FF59; Wed, 28 Jan 2026 12:55:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769604921; cv=none; b=sdq1XKHXZunSDV1ImO+OynF9eJ4jEsFJJ8duoJKuKuQOig3IM1sGMk1DkYpUtlRSQW96rcz39iraJ2kW30KqBvVh/BV6j8NwalokMVJBDeoioPfUROgOgtU/KSNf6tfQ9D+MguPCkw/ErPuyDNcDuo5dEMzUvFli8/MuqpDneNk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769604921; c=relaxed/simple; bh=nvx0pzDMUCUQRnDLUIB4oTe85CB/B2famYO/awEkHsQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Z+uN7ZkZBqqro4jZqZUuqdZbkPv95jVs+xHz4G5fObp1GjKcn7QFx3ycVpiHZsgPKxeGOGBQ7zQuXL9wIOvP3EILaeqXQxNWJQe1A+/A4iTR0Ft2KEs+8KPj1n1y9sjTj6aPjgGn+fjFmM9+uBxKshQR3KNM88/qqHQNePFgixc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 9448c030fc4811f0b0f03b4cfa9209d1-20260128 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_UNTRUSTED, SRC_UNTRUSTED, IP_UNFAMILIAR, SRC_UNFAMILIAR DN_TRUSTED, SRC_TRUSTED, SA_TRUSTED, SA_EXISTED, SN_TRUSTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD_SPF CIE_UNKNOWN, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:168305d2-bc71-444d-a98e-7baeb28e2e6f,IP:10,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:5 X-CID-INFO: VERSION:1.3.6,REQID:168305d2-bc71-444d-a98e-7baeb28e2e6f,IP:10,URL :0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:5 X-CID-META: VersionHash:a9d874c,CLOUDID:232bfff06d43625ae7096e50e9305987,BulkI D:2601282055117T6T78JL,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bu lk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR: 0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_FAS,TF_CID_SPAM_FSD,TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 9448c030fc4811f0b0f03b4cfa9209d1-20260128 X-User: tianyaxiong@kylinos.cn Received: from localhost.localdomain [(175.2.149.138)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 339552490; Wed, 28 Jan 2026 20:55:10 +0800 From: Yaxiong Tian To: mhiramat@kernel.org, rostedt@goodmis.org, axboe@kernel.dk, mathieu.desnoyers@efficios.com, corbet@lwn.net, skhan@linuxfoundation.org Cc: linux-trace-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Yaxiong Tian Subject: [PATCH v4 3/5] tracing/kprobes: Skip setup_boot_kprobe_events() when no cmdline event Date: Wed, 28 Jan 2026 20:55:07 +0800 Message-Id: <20260128125507.1715149-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260128125117.1704853-1-tianyaxiong@kylinos.cn> References: <20260128125117.1704853-1-tianyaxiong@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When the 'kprobe_event=3D' kernel command-line parameter is not provided, there is no need to execute setup_boot_kprobe_events(). This change optimizes the initialization function init_kprobe_trace() by skipping unnecessary work and effectively prevents potential blocking that could arise from contention on the event_mutex lock in subsequent operations. Signed-off-by: Yaxiong Tian --- kernel/trace/trace_kprobe.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 9953506370a5..89d2740f7bb5 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -2048,6 +2048,10 @@ static __init int init_kprobe_trace(void) trace_create_file("kprobe_profile", TRACE_MODE_READ, NULL, NULL, &kprobe_profile_ops); =20 + /* If no 'kprobe_event=3D' cmd is provided, return directly. */ + if (kprobe_boot_events_buf[0] =3D=3D '\0') + return 0; + setup_boot_kprobe_events(); =20 return 0; --=20 2.25.1