/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_KCONFIG_H #define __LINUX_KCONFIG_H #include <generated/autoconf.h> #ifdef CONFIG_CPU_BIG_ENDIAN #define __BIG_ENDIAN … #else #define __LITTLE_ENDIAN … #endif #define __ARG_PLACEHOLDER_1 … #define __take_second_arg(__ignored, val, ...) … /* * The use of "&&" / "||" is limited in certain expressions. * The following enable to calculate "and" / "or" with macro expansion only. */ #define __and(x, y) … #define ___and(x, y) … #define ____and(arg1_or_junk, y) … #define __or(x, y) … #define ___or(x, y) … #define ____or(arg1_or_junk, y) … /* * 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 __is_defined(x) … #define ___is_defined(val) … #define ____is_defined(arg1_or_junk) … /* * 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_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0 * otherwise. CONFIG_FOO=m results in "#define CONFIG_FOO_MODULE 1" in * autoconf.h. */ #define IS_MODULE(option) … /* * 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) … /* * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm', * 0 otherwise. Note that CONFIG_FOO=y results in "#define CONFIG_FOO 1" in * autoconf.h, while CONFIG_FOO=m results in "#define CONFIG_FOO_MODULE 1". */ #define IS_ENABLED(option) … #endif /* __LINUX_KCONFIG_H */
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