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