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

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Date: Wed, 3 Jan 2024 20:43:34 +0800
From: Alex Shi <seakeel@...il.com>
To: alexs@...nel.org
Cc: 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, 
	"H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/dumpstack: uniform die messages

On Tue, Jan 2, 2024 at 3:42 PM <alexs@...nel.org> wrote:
>
> From: Alex Shi <alexs@...nel.org>
>
> panic() has a uniform preempt, like "Kernel panic - not syncing:". But
> die() doesn't have.
>
> We died thousands machine with very different reasons. With current die
> messages in dmesg, it's hard to write scripts to collect and anaylis the
> die reasons. So we'd better give die() a uniform preempt to make the
> life of system administrators a bit easier.

Sorry for the typo, s/preempt/prompt/,
And any comments are appreciated!

>
> 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 | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
> index f18ca44c904b..00766e7ac077 100644
> --- a/arch/x86/kernel/dumpstack.c
> +++ b/arch/x86/kernel/dumpstack.c
> @@ -393,6 +393,8 @@ void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
>  }
>  NOKPROBE_SYMBOL(oops_end);
>
> +#define DIE_PREEMPT    "DIE:\n"
> +
>  static void __die_header(const char *str, struct pt_regs *regs, long err)
>  {
>         const char *pr = "";
> @@ -405,8 +407,8 @@ 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,
> +              DIE_PREEMPT "%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
>