__raw_cpu_write
#define raw_cpu_write_1(pcp, val) __raw_cpu_write(1, , pcp, val)
#define raw_cpu_write_2(pcp, val) __raw_cpu_write(2, , pcp, val)
#define raw_cpu_write_4(pcp, val) __raw_cpu_write(4, , pcp, val)
#define this_cpu_write_1(pcp, val) __raw_cpu_write(1, volatile, pcp, val)
#define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val)
#define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val)
#define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val)
#define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val)