linux-kernel - Re: [PATCH 2/2] warn: print the DMI board info name in a WARN/WARN

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Date:	Fri, 28 Nov 2008 18:00:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] warn: print the DMI board info name in a
	WARN/WARN_ON


* Arjan van de Ven <arjan@...ux.intel.com> wrote:

> From acdc8771dfaf6e8236b9122364301f65f46d4b59 Mon Sep 17 00:00:00 2001
> From: Arjan van de Ven <arjan@...ux.intel.com>
> Date: Fri, 28 Nov 2008 08:32:44 -0800
> Subject: [PATCH] warn: print the DMI board info name in a WARN/WARN_ON
> 
> it's very useful for many low level WARN_ON's to find out which
> motherboard has the broken BIOS etc... this patch adds a printk
> to the WARN_ON code for this.
> On architectures without DMI, gcc should optimize the code out.
> 
> Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
> ---
>  kernel/panic.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 2b913aa..9c1b7e0 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -21,6 +21,7 @@
>  #include <linux/debug_locks.h>
>  #include <linux/random.h>
>  #include <linux/kallsyms.h>
> +#include <linux/dmi.h>
>  
>  int panic_on_oops;
>  static unsigned long tainted_mask;
> @@ -328,12 +329,16 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...)
>  {
>  	va_list args;
>  	char function[KSYM_SYMBOL_LEN];
> +	const char *board;
>  	unsigned long caller = (unsigned long)__builtin_return_address(0);
>  	sprint_symbol(function, caller);
>  
>  	printk(KERN_WARNING "------------[ cut here ]------------\n");
>  	printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
>  		line, function);
> +	board = dmi_get_system_info(DMI_PRODUCT_NAME);
> +	if (board)
> +		printk(KERN_WARNING "Hardware name: %s\n", board);
>  
>  	if (fmt) {
>  		va_start(args, fmt);

nice idea - applied to tip/core/debug.

On architectures (or systems) where there's no DMI_PRODUCT_NAME string 
available, we'll print nothing. It's also a simple lockless call so can 
be called from any context.

Andrew, any objections?

	Ingo
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