leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

USB: remove 8 bytes of padding from usb_host_interface on 64 bit builds

Browse Source 
Reorder elements in the usb_host_interface structure to remove 8 bytes
of padding on 64 bit builds , and so shrink it's size to 40 bytes.

usb_interface_descriptor is a odd size which leaves a gap that is not
big enough to hold a pointer, so moving extralen into that gap removes
the need for more padding.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Richard Kennedy 2012-07-10 17:19:25 +01:00 committed by Greg Kroah-Hartman
parent 0911052978
commit 0d5ff30658
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/usb.h
View File

@ -77,14 +77,15 @@ struct usb_host_endpoint {
struct usb_host_interface {
struct usb_interface_descriptor desc;
int extralen;
unsigned char *extra; /* Extra descriptors */
/* array of desc.bNumEndpoint endpoints associated with this
* interface setting. these will be in no particular order.
*/
struct usb_host_endpoint *endpoint;
char *string; /* iInterface string, if present */
unsigned char *extra; /* Extra descriptors */
int extralen;
};
enum usb_interface_condition {