linux-kernel - [PATCH v3] x86/dumpstack: uniform die messages prompt

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Date: Wed, 27 Mar 2024 10:44:19 +0800
From: alexs@...nel.org
To: Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT))
Cc: linux-kernel@...r.kernel.org,
	Alex Shi <alexs@...nel.org>
Subject: [PATCH v3] x86/dumpstack: uniform die messages prompt

From: Alex Shi <alexs@...nel.org>

panic() has a uniform prompt, like "Kernel panic - not syncing:". That's
easy to indicate a panic there. But die() message doesn't have.

We died thousands machine with very different reasons weekly. w/o a prompt
in dmesg, it's hard to write scripts to collect and anaylis the die reasons.
That makes admins' life pretty hard.

A uniform die() prompt like "Oops:" could save some hair for admins.

Signed-off-by: Alex Shi <alexs@...nel.org>
To: linux-kernel@...r.kernel.org
To: "H. Peter Anvin" <hpa@...or.com>
To: x86@...nel.org
To: Dave Hansen <dave.hansen@...ux.intel.com>
To: Borislav Petkov <bp@...en8.de>
To: Ingo Molnar <mingo@...hat.com>
To: Thomas Gleixner <tglx@...utronix.de>
To: Peter Zijlstra <peterz@...radead.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/kernel/dumpstack.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index f18ca44c904b..e1358ef80b59 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -405,8 +405,8 @@ static void __die_header(const char *str, struct pt_regs *regs, long err)
 		pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
 
 	printk(KERN_DEFAULT
-	       "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
-	       pr,
+	       "Oops: %s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff,
+	       ++die_counter, pr,
 	       IS_ENABLED(CONFIG_SMP)     ? " SMP"             : "",
 	       debug_pagealloc_enabled()  ? " DEBUG_PAGEALLOC" : "",
 	       IS_ENABLED(CONFIG_KASAN)   ? " KASAN"           : "",
-- 
2.43.0