Re: [PATCH] Improve acpi_dbg_level= documentation

[Randy Dunlap <randy.dunlap@oracle.com>]

On Wed, 18 Apr 2007 12:21:37 +0200 Andi Kleen wrote:

> 
> First it was documented twice.

acpi_dbg_layer and
acpi_dbg_level are different.

But the added text is Good.

> Since this is a fairly important option document it properly.
> I kept myself looking for this information again and again.
> 
> In particular the individual bits are fairly important. And add some 
> warnings.
> 
> Signed-off-by: Andi Kleen <ak@suse.de>
> 
> Index: linux/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux.orig/Documentation/kernel-parameters.txt
> +++ linux/Documentation/kernel-parameters.txt
> @@ -187,13 +187,16 @@ and is between 256 and 4096 characters. 
>  			1: enable, 0: disable. It is useful for boot time
>  			debugging. After system has booted up, it can be set
>  			via /proc/acpi/debug_layer.
> -
> -	acpi_dbg_level=	[HW,ACPI]
> -			Format: <int>
> -			Each bit of the <int> indicates an ACPI debug level,
> -			1: enable, 0: disable. It is useful for boot time
> -			debugging. After system has booted up, it can be set
> -			via /proc/acpi/debug_level.
> +			CONFIG_ACPI_DEBUG must be enabled for this to produce any output.
> +			Available bits (add the numbers together) to enable debug output
> +			for specific parts of the ACPI subsystem:
> +			1 utilities 2 hardware 4 events 8 tables 
> +			0x10 namespace 0x20 parser 0x40 dispatcher
> +			0x80 executer 0x100 resources 0x200 debugger
> +			0x400 os services
> +			The number can be in decimal or prefixed with 0x in hex.
> +			Warning: Many of these options can produce a lot of 
> +			output and make your system unusable. Be very careful.
>  
>  	acpi_fake_ecdt	[HW,ACPI] Workaround failure due to BIOS lacking ECDT
>  


---
~Randy
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