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1 | #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 */ |
47 |
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