RE: scripts/mod/file2alias.c cross compile problem

[Luck, Tony]

> Adrian Bunk: scripts/mod/file2alias.c is compiled with HOSTCC and ensures that
> kernel_ulong_t is correct, but it can't cope with different padding on
> different architectures.

Surely this is the root cause ... you can't expect that the alignment
rules of HOSTCC to make any sense for an arbitraty target.

> +#define FILLUP_LEN	7 /* dirty fix for i386 -> 64bit cross-compilation */
>  
>  struct acpi_device_id {
>  	__u8 id[ACPI_ID_LEN];
> +	__u8 dummy[FILLUP_LEN];
>  	kernel_ulong_t driver_data;
>  };

What's so special about this structure that we get an error?  Surely
there are many kernel structures with different alignment/padding
when built with i386 complier compared with ia64 compiler.  We can't
go around manually padding them all (it wastes time, and also wastes
memory on the 32-bit systems that don't need this padding).

-Tony
 
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