linux-kernel - [PATCH 10/21] ssb: fix alignment of struct bcma_device

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Date:	Tue, 23 Apr 2013 18:30:42 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	"John W. Linville" <linville@...driver.com>,
	Michael Buesch <mb@...sch.de>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: [PATCH 10/21] ssb: fix alignment of struct bcma_device_id

The ARM OABI and EABI disagree on the alignment of structures
with small members, so module init tools may interpret the
ssb device table incorrectly, as shown  by this warning when
building the b43 device driver in an OABI kernel:

FATAL: drivers/net/wireless/b43/b43: sizeof(struct ssb_device_id)=6 is
not a modulo of the size of section __mod_ssb_device_table=88.

Forcing the default (EABI) alignment on the structure makes this
problem go away. Since the ssb_device_id may have the same problem,
better fix both structures.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Russell King <linux@....linux.org.uk>
Cc: John W. Linville <linville@...driver.com>
Cc: Michael Buesch <mb@...sch.de>
Cc: Larry Finger <Larry.Finger@...inger.net>
---
 include/linux/mod_devicetable.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 779cf7c..ce363a5 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -360,7 +360,8 @@ struct ssb_device_id {
 	__u16	vendor;
 	__u16	coreid;
 	__u8	revision;
-};
+	__u8	__pad;
+} __attribute__((packed, aligned(2)));
 #define SSB_DEVICE(_vendor, _coreid, _revision)  \
 	{ .vendor = _vendor, .coreid = _coreid, .revision = _revision, }
 #define SSB_DEVTABLE_END  \
@@ -376,7 +377,7 @@ struct bcma_device_id {
 	__u16	id;
 	__u8	rev;
 	__u8	class;
-};
+} __attribute__((packed,aligned(2)));
 #define BCMA_CORE(_manuf, _id, _rev, _class)  \
 	{ .manuf = _manuf, .id = _id, .rev = _rev, .class = _class, }
 #define BCMA_CORETABLE_END  \
-- 
1.8.1.2

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