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/arch/powerpc/include/asm/jump_label.h

https://github.com/aicjofs/android_kernel_lge_v500_20d
C Header | 45 lines | 29 code | 8 blank | 8 comment | 0 complexity | 6b9c58df11be89ab83a3dc586255f2af MD5 | raw file
 1#ifndef _ASM_POWERPC_JUMP_LABEL_H
 2#define _ASM_POWERPC_JUMP_LABEL_H
 3
 4/*
 5 * Copyright 2010 Michael Ellerman, IBM Corp.
 6 *
 7 * This program is free software; you can redistribute it and/or
 8 * modify it under the terms of the GNU General Public License
 9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#include <linux/types.h>
14
15#include <asm/feature-fixups.h>
16
17#define JUMP_ENTRY_TYPE		stringify_in_c(FTR_ENTRY_LONG)
18#define JUMP_LABEL_NOP_SIZE	4
19
20static __always_inline bool arch_static_branch(struct static_key *key)
21{
22	asm goto("1:\n\t"
23		 "nop\n\t"
24		 ".pushsection __jump_table,  \"aw\"\n\t"
25		 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
26		 ".popsection \n\t"
27		 : :  "i" (key) : : l_yes);
28	return false;
29l_yes:
30	return true;
31}
32
33#ifdef CONFIG_PPC64
34typedef u64 jump_label_t;
35#else
36typedef u32 jump_label_t;
37#endif
38
39struct jump_entry {
40	jump_label_t code;
41	jump_label_t target;
42	jump_label_t key;
43};
44
45#endif /* _ASM_POWERPC_JUMP_LABEL_H */