linux-kernel - [PATCH 5/6] LoongArch: Add raw_show_trace to enable guess unwinder default

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Message-Id: <20221215040141.18610-6-hejinyang@loongson.cn>
Date:   Thu, 15 Dec 2022 12:01:40 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Qing Zhang <zhangqing@...ngson.cn>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH 5/6] LoongArch: Add raw_show_trace to enable guess unwinder default

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 <hejinyang@...ngson.cn>
---
 arch/loongarch/kernel/unwind_prologue.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/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 *state)
 	return !!__kernel_text_address(state->pc);
 }
 
+static int raw_show_trace;
+static int __init set_raw_show_trace(char *str)
+{
+	raw_show_trace = 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 = true;
 
+	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,
-- 
2.34.3