linux-kernel - [-next] FATAL: drivers/gpu/drm/udl/udl: sizeof(struct usb_device_id)=24 is not a modulo of the size of section __mod_usb_device

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Message-ID: <CAMuHMdXk6pByz14JcDgY+UE6QM0sHD8cbXye9CgOVSRRtr7J+Q@mail.gmail.com>
Date:	Fri, 15 Jun 2012 19:42:08 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Bjørn Mork <bjorn@...k.no>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	USB list <linux-usb@...r.kernel.org>, linux-kernel@...r.kernel.org,
	Linux-Next <linux-next@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: [-next] FATAL: drivers/gpu/drm/udl/udl: sizeof(struct
 usb_device_id)=24 is not a modulo of the size of section __mod_usb_device_table=44.

commit 81df2d594340dcb6d1a02191976be88a1ca8120c ("USB: allow match
on bInterfaceNumber") added a byte to the interior of struct usb_device_id,
enabling implicit padding:

--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -115,6 +118,9 @@ struct usb_device_id {
        __u8            bInterfaceSubClass;
        __u8            bInterfaceProtocol;

+       /* Used for vendor-specific interface matches */
+       __u8            bInterfaceNumber;
+
        /* not matched against */
        kernel_ulong_t  driver_info;
 };

On m68k, this causes failures like:

| FATAL: drivers/gpu/drm/udl/udl: sizeof(struct usb_device_id)=24 is
not a modulo of the size of section __mod_usb_device_table=44.
| Fix definition of struct usb_device_id in mod_devicetable.h

M68k is special in that it uses 2 for the alignment of 32-bit entities, hence
sizeof(struct usb_device_id) = 22.

However, when cross-compiling on amd64, sizeof(struct usb_device_id) = 24
in scripts/mod/file2alias.c.

m68k/allmodconfig at http://kisskb.ellerman.id.au/kisskb/buildresult/6518563/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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