From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (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 3A5FD1AC44D for ; Tue, 27 May 2025 06:19:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748326753; cv=none; b=uGrjvrDSzN+E3UAqTM+nXzRvRKOkzzogEGAMxwi8KWrs2dNSCJoxngxw23NdGWPMrH4Y8RVjj+xGYiZtbtpKirSJKQIM8WAl5v4wu5kKdIg+CVtI7wv0dK83Oj+ySpCUfr8PaFzsTDRp37Musw6/cSC7M3ISnuW6fpt7kDEwb2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748326753; c=relaxed/simple; bh=9YjYL/D5WD659JrEORf3GTCYoRum7YgcIs+QPawpLHU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YZubQvf03rlDrliPK/rOKALcd+YCjAxesI6zBIj27oFQjOkxVZ5gxem0Ik0cIYjHDQabh+k20kB1/RHUMbt69w/hsc3OnobRW/wiOgmtnD5RYa0dC8R+v0ixUBP9eGPwGTMJwzCJxnlzmQ1CFIC9XOSTDMsY9an9htnamZbF4us= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.216]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4b62X8219wzKHMjt for ; Tue, 27 May 2025 14:19:04 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id B51C01A19CD for ; Tue, 27 May 2025 14:19:02 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.107]) by APP4 (Coremail) with SMTP id gCh0CgBXul5UWTVo93uWNg--.23840S6; Tue, 27 May 2025 14:19:02 +0800 (CST) From: Ye Bin To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, mark.rutland@arm.com, linux-trace-kernel@vger.kernel.org Cc: yebin@huaweicloud.com, yebin10@huawei.com Subject: [PATCH v2 2/2] ftrace: don't allocate ftrace module map if ftrace is disabled Date: Tue, 27 May 2025 14:19:00 +0800 Message-Id: <20250527061900.1533462-3-yebin@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250527061900.1533462-1-yebin@huaweicloud.com> References: <20250527061900.1533462-1-yebin@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:gCh0CgBXul5UWTVo93uWNg--.23840S6 X-Coremail-Antispam: 1UD129KBjvdXoWruFykXr1rAFW3Cw47KF18AFb_yoWxZrg_ZF yUX3W8KryxCwn2vr4SvrZ7XF1UKw1UuF10kwn3tFW5J3WDXrn5G3W7C3sxCF42gFy8Wa9x ZFnFqa40gF13GjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbv8FF20E14v26rWj6s0DM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUXwA2048vs2IY02 0Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM2 8EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AI xVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20x vE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xv r2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxkF7I0En4kS14v26r126r1DMx AIw28IcxkI7VAKI48JMxAqzxv26xkF7I0En4kS14v26r126r1DMxC20s026xCaFVCjc4AY 6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17 CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF 0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIx AIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2 KfnxnUUI43ZEXa7VUUApnJUUUUU== X-CM-SenderInfo: p1hex046kxt4xhlfz01xgou0bp/ From: Ye Bin If the ftrace is disabled, it is meaningless to allocate module map. So add check in allocate_ftrace_mod_map(). Signed-off-by: Ye Bin --- kernel/trace/ftrace.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index ff5d9d73a4a7..1cac568a031c 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -7626,6 +7626,9 @@ allocate_ftrace_mod_map(struct module *mod, { struct ftrace_mod_map *mod_map; + if (ftrace_disabled) + return NULL; + mod_map = kmalloc(sizeof(*mod_map), GFP_KERNEL); if (!mod_map) return NULL; -- 2.34.1