From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Oliver Neukum <oliver@neukum.org>
Cc: linux-usb-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: need for packed attribute
Date: Fri, 6 Jan 2006 18:38:46 +0000 [thread overview]
Message-ID: <20060106183846.GF16093@flint.arm.linux.org.uk> (raw)
In-Reply-To: <200601061915.43961.oliver@neukum.org>
On Fri, Jan 06, 2006 at 07:15:43PM +0100, Oliver Neukum wrote:
> Hi,
>
> is there any architecture for which packed is required in structures like this:
>
> /* All standard descriptors have these 2 fields at the beginning */
> struct usb_descriptor_header {
> __u8 bLength;
> __u8 bDescriptorType;
> };
sizeof(struct usb_descriptor_header) will be 4 on ARM. If this
concerns you, you need to pack the structure thusly:
struct usb_descriptor_header {
__u8 bLength;
__u8 bDescriptorType;
} __attribute__((packed));
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
next prev parent reply other threads:[~2006-01-06 18:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-06 18:15 need for packed attribute Oliver Neukum
2006-01-06 18:38 ` Russell King [this message]
2006-01-12 18:32 ` Benjamin LaHaise
-- strict thread matches above, loose matches on Subject: below --
2006-01-12 12:27 Mikael Pettersson
2006-01-12 13:47 ` Russell King
2006-01-12 13:53 ` Russell King
2006-01-12 16:30 ` Mikael Pettersson
2006-01-12 16:46 ` Russell King
2006-01-12 17:20 ` Pete Zaitcev
2006-01-12 17:26 ` Russell King
2006-01-12 17:36 ` Pete Zaitcev
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