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 * We use a brcl 0,2 instruction for jump labels at compile time so it
13 * can be easily distinguished from a hotpatch generated instruction.
15 static __always_inline bool arch_static_branch(struct static_key *key)
17 asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
18 ".pushsection __jump_table, \"aw\"\n"
20 ".quad 0b, %l[label], %0\n"
22 : : "X" (key) : : label);
28 typedef unsigned long jump_label_t;
36 #endif /* __ASSEMBLY__ */