1 #ifndef _ASM_S390_JUMP_LABEL_H
2 #define _ASM_S390_JUMP_LABEL_H
4 #include <linux/types.h>
6 #define JUMP_LABEL_NOP_SIZE 6
7 #define JUMP_LABEL_NOP_OFFSET 2
10 #define ASM_PTR ".quad"
11 #define ASM_ALIGN ".balign 8"
13 #define ASM_PTR ".long"
14 #define ASM_ALIGN ".balign 4"
18 * We use a brcl 0,2 instruction for jump labels at compile time so it
19 * can be easily distinguished from a hotpatch generated instruction.
21 static __always_inline bool arch_static_branch(struct static_key *key)
23 asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
24 ".pushsection __jump_table, \"aw\"\n"
26 ASM_PTR " 0b, %l[label], %0\n"
28 : : "X" (key) : : label);
34 typedef unsigned long jump_label_t;