From nobody Wed Sep 17 23:52:18 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC049C4332F for ; Thu, 15 Dec 2022 04:03:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229732AbiLOED0 (ORCPT ); Wed, 14 Dec 2022 23:03:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229680AbiLOECT (ORCPT ); Wed, 14 Dec 2022 23:02:19 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 108322036F for ; Wed, 14 Dec 2022 20:02:17 -0800 (PST) Received: from loongson.cn (unknown [111.9.175.10]) by gateway (Coremail) with SMTP id _____8Cxl_FJnJpj+LkFAA--.12715S3; Thu, 15 Dec 2022 12:02:17 +0800 (CST) Received: from localhost.localdomain (unknown [111.9.175.10]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxtOVDnJpjVBkAAA--.887S7; Thu, 15 Dec 2022 12:02:16 +0800 (CST) From: Jinyang He To: Huacai Chen , WANG Xuerui , Qing Zhang Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Mark Rutland Subject: [PATCH 5/6] LoongArch: Add raw_show_trace to enable guess unwinder default Date: Thu, 15 Dec 2022 12:01:40 +0800 Message-Id: <20221215040141.18610-6-hejinyang@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221215040141.18610-1-hejinyang@loongson.cn> References: <20221215040141.18610-1-hejinyang@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8BxtOVDnJpjVBkAAA--.887S7 X-CM-SenderInfo: pkhmx0p1dqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7AF13WF43Jw4kXF43XFWrKrg_yoW8JF4Dpa ykCF9Ygr4fWFW2g347Xr1DuF98JF95Zw13uFZxAw1rCFsxK3W7Jr1Fv34Yva9Yyry8JryI qFsYkryj9ayjy3JanT9S1TB71UUUUjUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bSxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1l n4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6x ACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26rWY6Fy7McIj6I8E 87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxV Aaw2AFwI0_JF0_Jw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxY O2xFxVAFwI0_Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGV WUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_ Xr0_Ar1lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rV WUJVWUCwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4U JbIYCTnIWIevJa73UjIFyTuYvjxU36RRDUUUU Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Inspired by MIPS, add cmdline parameter named 'raw_show_trace' to enable guess unwinder in prologue unwinder unwind_start() default. In some cases the guess is more efficient than prologue. Signed-off-by: Jinyang He --- arch/loongarch/kernel/unwind_prologue.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kerne= l/unwind_prologue.c index 9677e13c4b4c..441641227c10 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -122,11 +122,22 @@ static bool unwind_by_prologue(struct unwind_state *s= tate) return !!__kernel_text_address(state->pc); } =20 +static int raw_show_trace; +static int __init set_raw_show_trace(char *str) +{ + raw_show_trace =3D 1; + return 1; +} +__setup("raw_show_trace", set_raw_show_trace); + static void start(struct unwind_state *state, struct task_struct *task, struct pt_regs *regs) { state->first =3D true; =20 + if (raw_show_trace) + unwind_register_unwinder(state, guard_unwinder); + /* * The current PC is not kernel text address, we cannot find its * relative symbol. Thus, prologue analysis will be broken. Luckly, --=20 2.34.3