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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2021-04-13 10:24:08 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@gmail.com> | 2021-04-13 10:24:15 -0400 |
| commit | 967c8704989f6194dc40ea884b5d0f713d4fb74c (patch) | |
| tree | d4a317ed7405e3f4174604a6c5450d44e98af923 /include/linux/kernel.h | |
| parent | b422ff58ba8eedcfef3b67b66468660f07b0cfc1 (diff) | |
Update bcachefs sources to 8eca47e4d5 bcachefs: Improved check_directory_structure()
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 4b45306d..44910d32 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -12,7 +12,48 @@ #include <linux/byteorder.h> #include <linux/compiler.h> -#define IS_ENABLED(opt) 0 +#define __ARG_PLACEHOLDER_1 0, +#define __take_second_arg(__ignored, val, ...) val + +#define __and(x, y) ___and(x, y) +#define ___and(x, y) ____and(__ARG_PLACEHOLDER_##x, y) +#define ____and(arg1_or_junk, y) __take_second_arg(arg1_or_junk y, 0) + +#define __or(x, y) ___or(x, y) +#define ___or(x, y) ____or(__ARG_PLACEHOLDER_##x, y) +#define ____or(arg1_or_junk, y) __take_second_arg(arg1_or_junk 1, y) + +#define __is_defined(x) ___is_defined(x) +#define ___is_defined(val) ____is_defined(__ARG_PLACEHOLDER_##val) +#define ____is_defined(arg1_or_junk) __take_second_arg(arg1_or_junk 1, 0) + +/* + * 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) __is_defined(option) + +/* + * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 + * otherwise. + */ +#define IS_MODULE(option) __is_defined(option##_MODULE) + +/* + * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled + * code can call a function defined in code compiled based on CONFIG_FOO. + * This is similar to IS_ENABLED(), but returns false when invoked from + * built-in code when CONFIG_FOO is set to 'm'. + */ +#define IS_REACHABLE(option) __or(IS_BUILTIN(option), \ + __and(IS_MODULE(option), __is_defined(MODULE))) + +/* + * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', + * 0 otherwise. + */ +#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option)) #define EXPORT_SYMBOL(sym) #define U8_MAX ((u8)~0U) |