linux-kernel - RE: scripts/mod/file2alias.c cross compile problem

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Message-ID: <617E1C2C70743745A92448908E030B2A0211AFF0@scsmsx411.amr.corp.intel.com>
Date:	Thu, 2 Aug 2007 09:25:58 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	<trenn@...e.de>, "Adrian Bunk" <bunk@...sta.de>
Cc:	"Sam Ravnborg" <sam@...nborg.org>, "Jan Dittmer" <jdi@....org>,
	"Len Brown" <lenb@...nel.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>
Subject: RE: scripts/mod/file2alias.c cross compile problem

> 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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