datapath/linux/compat/include/linux/kconfig.h

   1 #ifndef __LINUX_KCONFIG_WRAPPER_H
   2 #define __LINUX_KCONFIG_WRAPPER_H
   3
   4 #include <linux/version.h>
   5
   6 #ifndef IS_ENABLED
   7
   8 /*
   9  * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
  10  * these only work with boolean and tristate options.
  11  */
  12
  13 /*
  14  * Getting something that works in C and CPP for an arg that may or may
  15  * not be defined is tricky.  Here, if we have "#define CONFIG_BOOGER 1"
  16  * we match on the placeholder define, insert the "0," for arg1 and generate
  17  * the triplet (0, 1, 0).  Then the last step cherry picks the 2nd arg (a one).
  18  * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
  19  * the last step cherry picks the 2nd arg, we get a zero.
  20  */
  21 #define __ARG_PLACEHOLDER_1 0,
  22 #define config_enabled(cfg) _config_enabled(cfg)
  23 #define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
  24 #define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
  25 #define ___config_enabled(__ignored, val, ...) val
  26
  27 /*
  28  * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
  29  * 0 otherwise.
  30  *
  31  */
  32 #define IS_ENABLED(option) \
  33         (config_enabled(option) || config_enabled(option##_MODULE))
  34
  35 /*
  36  * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
  37  * otherwise. For boolean options, this is equivalent to
  38  * IS_ENABLED(CONFIG_FOO).
  39  */
  40 #define IS_BUILTIN(option) config_enabled(option)
  41
  42 /*
  43  * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
  44  * otherwise.
  45  */
  46 #define IS_MODULE(option) config_enabled(option##_MODULE)
  47
  48 #endif /* IS_ENABLED */
  49 #endif /* __LINUX_KCONFIG_WRAPER_H */