Re: need for packed attribute

[Russell King <rmk+lkml@arm.linux.org.uk>]

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
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