25 unsigned long __xchg(unsigned long x, volatile void *ptr, int size)  in __xchg()  argument
32 		return __xchg_u8(x, ptr);  in __xchg()
36 		*(volatile u8 *)ptr = x;  in __xchg()
43 		return __xchg_u16(x, ptr);  in __xchg()
47 		*(volatile u16 *)ptr = x;  in __xchg()
54 		return __xchg_u32(x, ptr);  in __xchg()
58 		*(volatile u32 *)ptr = x;  in __xchg()
66 		return __xchg_u64(x, ptr);  in __xchg()
70 		*(volatile u64 *)ptr = x;  in __xchg()
78 		return x;  in __xchg()
82 #define xchg(ptr, x) \  argument
83 	((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))