Because <linux/linkage.h> doesn't exist in userspace, it should be only
included from within #ifdef __KERNEL__.  Move the corresponding #include
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>