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Masahiro Yamada0a9064f2014-07-30 14:08:13 +09001#ifndef __LINUX_KCONFIG_H
2#define __LINUX_KCONFIG_H
3
4#include <generated/autoconf.h>
5
6/*
7 * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
8 * these only work with boolean and tristate options.
9 */
10
11/*
12 * Getting something that works in C and CPP for an arg that may or may
13 * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1"
14 * we match on the placeholder define, insert the "0," for arg1 and generate
15 * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one).
16 * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
17 * the last step cherry picks the 2nd arg, we get a zero.
18 */
19#define __ARG_PLACEHOLDER_1 0,
20#define config_enabled(cfg) _config_enabled(cfg)
21#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
22#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
23#define ___config_enabled(__ignored, val, ...) val
24
25/*
26 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
27 * 0 otherwise.
28 *
29 */
30#define IS_ENABLED(option) \
31 (config_enabled(option) || config_enabled(option##_MODULE))
32
33/*
34 * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
35 * otherwise. For boolean options, this is equivalent to
36 * IS_ENABLED(CONFIG_FOO).
37 */
38#define IS_BUILTIN(option) config_enabled(option)
39
40/*
41 * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
42 * otherwise.
43 */
44#define IS_MODULE(option) config_enabled(option##_MODULE)
45
46#endif /* __LINUX_KCONFIG_H */