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By moving one field around in 'struct urb' we reduce the size of the structure by 8 bytes. Before the patch on x86_64 the overall size of the structure as reported by pahole was: /* size: 192, cachelines: 3, members: 30 */ /* sum members: 184, holes: 2, sum holes: 8 */ After the patch we now have: /* size: 184, cachelines: 3, members: 30 */ /* last cacheline: 56 bytes */ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>