arch/s390/include/asm/jump_label.h

   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