linux-kernel - Re: Trying to convert old modules to newer kernels

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Date:	Fri, 21 Dec 2007 11:39:36 -0500
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Lennart Sorensen" <lsorense@...lub.uwaterloo.ca>
Cc:	"Sam Ravnborg" <sam@...nborg.org>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Trying to convert old modules to newer kernels

On Fri, 21 Dec 2007, Lennart Sorensen wrote:

> On Thu, Dec 20, 2007 at 04:27:37PM -0500, linux-os (Dick Johnson) wrote:
>> I need to get rid of -mregparm=3 on gcc's command line. It
>> is completely incompatible with the standard calling conventions
>> used in all our assembly-language files in our drivers. We make
>> very high-speed number-crunching drivers that munge high-speed
>> data into images. We need to do that in assembly as we have
>> always done.
>
> Well I guess you can either fix the assembly once and for all to handle
> the current linux way of doing things, or you can patch to kernel back
> to the old ways of doing things when using your driver.
>
> I suppose you could just add some wrapper functions to your assembly
> that uses the new regparm calling method and then calls your methods the
> old way and selectively enable those when regparm is used by the kernel
> if you want to support all kernel versions.  Or you could use inline
> assembly in C functions to handle the calling convention for you.
>
> --
> Len Sorensen
>

It's easier that that, just declare the assembly-language
functions to be of type __attribute((regparm=0))__ or however
you spell it (I'm not at my usual machine)!

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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