asm-generic/set_memory.h:int set_memory_ro(unsigned long addr, int numpages);
asm-generic/set_memory.h:int set_memory_rw(unsigned long addr, int numpages);
asm-generic/set_memory.h:int set_memory_x(unsigned long addr, int numpages);
asm-generic/set_memory.h:int set_memory_nx(unsigned long addr, int numpages);