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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576/* 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 4321#else#define __LITTLE_ENDIAN 1234#endif
#define __ARG_PLACEHOLDER_1 0,#define __take_second_arg(__ignored, val, ...) val
/* * The use of "&&" / "||" is limited in certain expressions. * The following enable to calculate "and" / "or" with macro expansion only. */#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)
/* * 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) ___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. CONFIG_FOO=m results in "#define CONFIG_FOO_MODULE 1" in * autoconf.h. */#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. 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) __or(IS_BUILTIN(option), IS_MODULE(option))
#endif /* __LINUX_KCONFIG_H */