linux-kernel - Re: [PATCH]: MTRR: fix 32-bit ioctls on x64

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Date:	Tue, 16 Jan 2007 13:48:16 +0100 (MET)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	giuliano.procida@...glemail.com, rgooch@...f.csiro.au
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH]: MTRR: fix 32-bit ioctls on x64_32

On Tue, 16 Jan 2007 08:14:30 +0000, Giuliano Procida wrote:
> [MTRR] fix 32-bit ioctls on x64_32
> 
> Signed-off-by: Giuliano Procida <giuliano.procida@...glemail.com>
> 
> ---
> 
> Fixed incomplete support for 32-bit compatibility ioctls in
> 2.6.19.1. They were unhandled in one of three case-statements.
> Testing using X server before and after change.
> 
> --- linux-source-2.6.19.1.orig/arch/i386/kernel/cpu/mtrr/if.c	2006-12-11 19:32:53.000000000 +0000
> +++ linux-source-2.6.19.1/arch/i386/kernel/cpu/mtrr/if.c	2007-01-16 07:31:06.000000000 +0000
> @@ -211,6 +211,9 @@ mtrr_ioctl(struct file *file, unsigned i
>  	default:
>  		return -ENOTTY;
>  	case MTRRIOC_ADD_ENTRY:
> +#ifdef CONFIG_COMPAT
> +	case MTRRIOC32_ADD_ENTRY:
> +#endif
>  		if (!capable(CAP_SYS_ADMIN))
>  			return -EPERM;
>  		err =
> @@ -218,21 +221,33 @@ mtrr_ioctl(struct file *file, unsigned i
>  				  file, 0);
>  		break;
>  	case MTRRIOC_SET_ENTRY:
> +#ifdef CONFIG_COMPAT
> +	case MTRRIOC32_SET_ENTRY:
> +#endif

etc

These #ifdefs are too ugly.

Since you apparently just add aliases for the case labels,
and do no actual code changes, why not
1. make the new cases unconditional, or 
2. invoke a translation function before the switch which
   maps the MTRRCIOC32_ constants to what the kernel uses

/Mikael
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