From 0a9064fb47bb0a239c04b0b63edebfdd3a201fdc Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 30 Jul 2014 14:08:13 +0900 Subject: kconfig: import Kconfig files from Linux 3.16-rc7 Import - scripts/kconfig/* - include/linux/kconfig.h from Linux 3.16-rc7. Signed-off-by: Masahiro Yamada Reviewed-by: Simon Glass --- include/linux/kconfig.h | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 include/linux/kconfig.h (limited to 'include/linux') diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h new file mode 100644 index 0000000000..be342b94c6 --- /dev/null +++ b/include/linux/kconfig.h @@ -0,0 +1,46 @@ +#ifndef __LINUX_KCONFIG_H +#define __LINUX_KCONFIG_H + +#include + +/* + * Helper macros to use CONFIG_ options in C/CPP expressions. Note that + * these only work with boolean and tristate options. + */ + +/* + * Getting something that works in C and CPP for an arg that may or may + * not be defined is tricky. Here, if we have "#define CONFIG_BOOGER 1" + * we match on the placeholder define, insert the "0," for arg1 and generate + * the triplet (0, 1, 0). Then the last step cherry picks the 2nd arg (a one). + * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when + * the last step cherry picks the 2nd arg, we get a zero. + */ +#define __ARG_PLACEHOLDER_1 0, +#define config_enabled(cfg) _config_enabled(cfg) +#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value) +#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0) +#define ___config_enabled(__ignored, val, ...) val + +/* + * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', + * 0 otherwise. + * + */ +#define IS_ENABLED(option) \ + (config_enabled(option) || config_enabled(option##_MODULE)) + +/* + * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0 + * otherwise. For boolean options, this is equivalent to + * IS_ENABLED(CONFIG_FOO). + */ +#define IS_BUILTIN(option) config_enabled(option) + +/* + * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 + * otherwise. + */ +#define IS_MODULE(option) config_enabled(option##_MODULE) + +#endif /* __LINUX_KCONFIG_H */ -- cgit v1.2.1