kconfig.h 1.5 KB

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