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

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Message-ID: <617E1C2C70743745A92448908E030B2A02156CC1@scsmsx411.amr.corp.intel.com>
Date:	Thu, 2 Aug 2007 10:40:14 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Andreas Schwab" <schwab@...e.de>
Cc:	<trenn@...e.de>, "Adrian Bunk" <bunk@...sta.de>,
	"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

>>>  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?
>
> It's special because it's a device_id structure, and those structures
> must come out identical using either the host or the target compiler.

That didn't help me understand.  Are device_id structures visible
in some user-level API?  If so, then I can see why they'd need to
be the same (but then I'd be confused why this structure uses a
"kernel_ulong_t" type).

-Tony
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