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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: