1 #ifndef _ASM_S390_JUMP_LABEL_H 2 #define _ASM_S390_JUMP_LABEL_H 3 4 #include <linux/types.h> 5 6 #define JUMP_LABEL_NOP_SIZE 6 7 8 #ifdef CONFIG_64BIT 9 #define ASM_PTR ".quad" 10 #define ASM_ALIGN ".balign 8" 11 #else 12 #define ASM_PTR ".long" 13 #define ASM_ALIGN ".balign 4" 14 #endif 15 16 static __always_inline bool arch_static_branch(struct static_key *key) 17 { 18 asm_volatile_goto("0: brcl 0,0\n" 19 ".pushsection __jump_table, \"aw\"\n" 20 ASM_ALIGN "\n" 21 ASM_PTR " 0b, %l[label], %0\n" 22 ".popsection\n" 23 : : "X" (key) : : label); 24 return false; 25 label: 26 return true; 27 } 28 29 typedef unsigned long jump_label_t; 30 31 struct jump_entry { 32 jump_label_t code; 33 jump_label_t target; 34 jump_label_t key; 35 }; 36 37 #endif 38