several oopses during boot (was: Re: [PATCH] Add CONFIG for -mregparm=3)

[Sander <sander@humilis.net>]

Hi Andi and Andrew,

Andi Kleen wrote (ao):
> Using -mregparm=3 shrinks the kernel further:

...

> This patch adds an option to use -mregparm=3 while compiling the kernel.
> I did an LTP run and it showed no additional failures over an non 
> regparm kernel.
> 
> According to some gcc developers it should be safe to use in all
> gccs that are still supports (2.95 and up) 
> 
> I didn't make it the default because it will break all binary only
> modules (although they can be fixed by adding a wrapper that 
> calls them with "asmlinkage"). Actually it may be a good idea to 
> make this default with 2.7.1 or somesuch.

...
  
> +config REGPARM
> +	bool "Use register arguments (EXPERIMENTAL)"
> +	default n
> +	help
> +	Compile the kernel with -mregparm=3. This uses an different ABI
> +	and passes the first three arguments of a function call in registers.
> +	This will probably break binary only modules.	

This gives several oopses on my system during boot, after which is seems
dead.

2.6.1-mm4
VIA C3 Ezra

It mounts its root filesystem over nfs and has netconsole compiled in.

Without the REGPARM option the system boots and runs fine.

Should I post the oopses, the result of ksymoops, a dmesg and kernel
config or is this an already known issue?

Kind regards, Sander

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