linux-kernel - Re: [PATCH] Add TAINT_HARDWARE

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Date:	Thu, 17 Jun 2010 09:13:22 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	linux-kernel@...r.kernel.org, dzickus@...hat.com
Subject: Re: [PATCH] Add TAINT_HARDWARE_UNSUPPORTED flag

On Thu, 17 Jun 2010 09:54:45 -0400 Prarit Bhargava wrote:

> This patch is similar to Theordore Ts'o's TAINT_USER patch,
> linux-2.6 commit 34f5a39899f3f3e815da64f48ddb72942d86c366.

and augmented by 92946bc72f2e74c3281b7fc12be9704d455fb3ed, so please
add similar info to Documentation/oops-tracing.txt.


> This patch introduces the TAINT_HARDWARE_UNSUPPORTED flag for distributions
> to use.
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
> Signed-off-by: Don Zickus <dzickus@...hat.com>
> 
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 8317ec4..f722b0d 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -347,6 +347,7 @@ extern enum system_states {
>  #define TAINT_WARN			9
>  #define TAINT_CRAP			10
>  #define TAINT_FIRMWARE_WORKAROUND	11
> +#define TAINT_HARDWARE_UNSUPPORTED	12
>  
>  extern void dump_stack(void) __cold;
>  
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 3b16cd9..394a5bb 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -180,6 +180,7 @@ static const struct tnt tnts[] = {
>  	{ TAINT_WARN,			'W', ' ' },
>  	{ TAINT_CRAP,			'C', ' ' },
>  	{ TAINT_FIRMWARE_WORKAROUND,	'I', ' ' },
> +	{ TAINT_HARDWARE_UNSUPPORTED,	'H', ' ' },
>  };
>  
>  /**
> @@ -197,6 +198,7 @@ static const struct tnt tnts[] = {
>   *  'W' - Taint on warning.
>   *  'C' - modules from drivers/staging are loaded.
>   *  'I' - Working around severe firmware bug.
> + *  'H' - Hardware is unsupported.
>   *
>   *	The string is overwritten by the next call to print_tainted().
>   */
> @@ -243,6 +245,9 @@ void add_taint(unsigned flag)
>  	 */
>  	if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off())
>  		printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n");
> +	if (flag == TAINT_HARDWARE_UNSUPPORTED)
> +		printk(KERN_CRIT "WARNING: This system's hardware is "
> +		       "unsupported.\n");

Preferable not to split the string, so more like:

		printk(KERN_CRIT
			"WARNING: This system's hardware is unsupported.\n");
>  
>  	set_bit(flag, &tainted_mask);
>  }
> --


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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