mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 23:20:50 +07:00
c0a0aba8e4
The use of config_enabled() is ambiguous. For config options, IS_ENABLED(), IS_REACHABLE(), etc. will make intention clearer. Sometimes config_enabled() has been used for non-config options because it is useful to check whether the given symbol is defined or not. I have been tackling on deprecating config_enabled(), and now is the time to finish this work. Some new users have appeared for v4.9-rc1, but it is trivial to replace them: - arch/x86/mm/kaslr.c replace config_enabled() with IS_ENABLED() because CONFIG_X86_ESPFIX64 and CONFIG_EFI are boolean. - include/asm-generic/export.h replace config_enabled() with __is_defined(). Then, config_enabled() can be removed now. Going forward, please use IS_ENABLED(), IS_REACHABLE(), etc. for config options, and __is_defined() for non-config symbols. Link: http://lkml.kernel.org/r/1476616078-32252-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Kees Cook <keescook@chromium.org> Cc: Michal Marek <mmarek@suse.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Garnier <thgarnie@google.com> Cc: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
#ifndef __LINUX_KCONFIG_H
|
|
#define __LINUX_KCONFIG_H
|
|
|
|
#include <generated/autoconf.h>
|
|
|
|
#define __ARG_PLACEHOLDER_1 0,
|
|
#define __take_second_arg(__ignored, val, ...) val
|
|
|
|
/*
|
|
* The use of "&&" / "||" is limited in certain expressions.
|
|
* The followings 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.
|
|
*/
|
|
#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))
|
|
|
|
#endif /* __LINUX_KCONFIG_H */
|