linux-kernel - Re: m68k build failure

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Date:	Wed, 28 Nov 2007 13:29:16 +0100
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-kernel@...r.kernel.org
Subject: Re: m68k build failure

On Wed, 28 Nov 2007 09:28:56 +0000
Al Viro <viro@....linux.org.uk> wrote:

> 
> Eh...  m68k has 16bit alignment for unsigned long.  
> 
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -343,7 +343,8 @@ struct sdio_device_id {
>  	__u8	class;			/* Standard interface or SDIO_ANY_ID */
>  	__u16	vendor;			/* Vendor or SDIO_ANY_ID */
>  	__u16	device;			/* Device ID or SDIO_ANY_ID */
> -	kernel_ulong_t driver_data;	/* Data private to the driver */
> +	kernel_ulong_t driver_data	/* Data private to the driver */
> +		__attribute__((aligned(sizeof(kernel_ulong_t))));
>  };
>  
>  /* SSB core, see drivers/ssb/ */

Unfortunately, that just papers over the symptom and doesn't solve the underlying issue. If you cross-compile on/for an arch with byte alignment, then the issue is back. Or one that uses 4-byte alignment even for u16.

Is there no directive we can stick in there that forces a reasonable alignment (e.g. alignment == sizeof(type)) independently of arch?

Rgds
Pierre

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