2011-07-20 15:38:57 +00:00
|
|
|
#ifndef __LINUX_KCONFIG_H
|
|
|
|
#define __LINUX_KCONFIG_H
|
|
|
|
|
|
|
|
#include <generated/autoconf.h>
|
|
|
|
|
kconfig.h: allow to use IS_{ENABLE,REACHABLE} in macro expansion
The typical usage of IS_ENABLED() is
if (IS_ENABLED(CONFIG_FOO)) {
...
}
or
#if IS_ENABLED(CONFIG_FOO)
...
#endif
The current implementation of IS_ENABLED() includes "||" operator,
which works well in those expressions like above.
However, there is a case where we want to evaluate a config option
beyond those use cases.
For example, the OF_TABLE() in include/asm-generic/vmlinux.lds.h
needs to evaluate a config option in macro expansion:
#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
#define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
#define _OF_TABLE_0(name)
#define _OF_TABLE_1(name) \
...
Here, we can not use IS_ENABLED() because of the "||" operator in
its define. It is true config_enabled() works well, but it is a bit
ambiguous to be used against config options.
This commit makes IS_ENABLED() available in more generic context by
calculating "or" with macro expansion only.
Do likewise for IS_REACHABLE().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
2016-06-14 05:58:57 +00:00
|
|
|
#define __ARG_PLACEHOLDER_1 0,
|
|
|
|
#define __take_second_arg(__ignored, val, ...) val
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The use of "&&" / "||" is limited in certain expressions.
|
2017-02-27 22:29:56 +00:00
|
|
|
* The following enable to calculate "and" / "or" with macro expansion only.
|
kconfig.h: allow to use IS_{ENABLE,REACHABLE} in macro expansion
The typical usage of IS_ENABLED() is
if (IS_ENABLED(CONFIG_FOO)) {
...
}
or
#if IS_ENABLED(CONFIG_FOO)
...
#endif
The current implementation of IS_ENABLED() includes "||" operator,
which works well in those expressions like above.
However, there is a case where we want to evaluate a config option
beyond those use cases.
For example, the OF_TABLE() in include/asm-generic/vmlinux.lds.h
needs to evaluate a config option in macro expansion:
#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
#define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
#define _OF_TABLE_0(name)
#define _OF_TABLE_1(name) \
...
Here, we can not use IS_ENABLED() because of the "||" operator in
its define. It is true config_enabled() works well, but it is a bit
ambiguous to be used against config options.
This commit makes IS_ENABLED() available in more generic context by
calculating "or" with macro expansion only.
Do likewise for IS_REACHABLE().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
2016-06-14 05:58:57 +00:00
|
|
|
*/
|
|
|
|
#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)
|
|
|
|
|
2011-07-20 15:38:57 +00:00
|
|
|
/*
|
2012-04-12 23:46:32 +00:00
|
|
|
* Helper macros to use CONFIG_ options in C/CPP expressions. Note that
|
2011-07-20 15:38:57 +00:00
|
|
|
* these only work with boolean and tristate options.
|
|
|
|
*/
|
|
|
|
|
2012-04-12 23:46:32 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2016-06-14 05:58:54 +00:00
|
|
|
#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)
|
2012-04-12 23:46:32 +00:00
|
|
|
|
2011-07-20 15:38:57 +00:00
|
|
|
/*
|
|
|
|
* 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).
|
|
|
|
*/
|
kconfig.h: remove config_enabled() macro
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>
2016-10-28 00:46:38 +00:00
|
|
|
#define IS_BUILTIN(option) __is_defined(option)
|
2011-07-20 15:38:57 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
|
|
|
|
* otherwise.
|
|
|
|
*/
|
kconfig.h: remove config_enabled() macro
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>
2016-10-28 00:46:38 +00:00
|
|
|
#define IS_MODULE(option) __is_defined(option##_MODULE)
|
2011-07-20 15:38:57 +00:00
|
|
|
|
2015-02-18 17:12:42 +00:00
|
|
|
/*
|
|
|
|
* 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'.
|
|
|
|
*/
|
kconfig.h: allow to use IS_{ENABLE,REACHABLE} in macro expansion
The typical usage of IS_ENABLED() is
if (IS_ENABLED(CONFIG_FOO)) {
...
}
or
#if IS_ENABLED(CONFIG_FOO)
...
#endif
The current implementation of IS_ENABLED() includes "||" operator,
which works well in those expressions like above.
However, there is a case where we want to evaluate a config option
beyond those use cases.
For example, the OF_TABLE() in include/asm-generic/vmlinux.lds.h
needs to evaluate a config option in macro expansion:
#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
#define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
#define _OF_TABLE_0(name)
#define _OF_TABLE_1(name) \
...
Here, we can not use IS_ENABLED() because of the "||" operator in
its define. It is true config_enabled() works well, but it is a bit
ambiguous to be used against config options.
This commit makes IS_ENABLED() available in more generic context by
calculating "or" with macro expansion only.
Do likewise for IS_REACHABLE().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
2016-06-14 05:58:57 +00:00
|
|
|
#define IS_REACHABLE(option) __or(IS_BUILTIN(option), \
|
|
|
|
__and(IS_MODULE(option), __is_defined(MODULE)))
|
2015-02-18 17:12:42 +00:00
|
|
|
|
2015-04-16 19:48:38 +00:00
|
|
|
/*
|
|
|
|
* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
|
|
|
|
* 0 otherwise.
|
|
|
|
*/
|
kconfig.h: allow to use IS_{ENABLE,REACHABLE} in macro expansion
The typical usage of IS_ENABLED() is
if (IS_ENABLED(CONFIG_FOO)) {
...
}
or
#if IS_ENABLED(CONFIG_FOO)
...
#endif
The current implementation of IS_ENABLED() includes "||" operator,
which works well in those expressions like above.
However, there is a case where we want to evaluate a config option
beyond those use cases.
For example, the OF_TABLE() in include/asm-generic/vmlinux.lds.h
needs to evaluate a config option in macro expansion:
#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
#define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
#define _OF_TABLE_0(name)
#define _OF_TABLE_1(name) \
...
Here, we can not use IS_ENABLED() because of the "||" operator in
its define. It is true config_enabled() works well, but it is a bit
ambiguous to be used against config options.
This commit makes IS_ENABLED() available in more generic context by
calculating "or" with macro expansion only.
Do likewise for IS_REACHABLE().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
2016-06-14 05:58:57 +00:00
|
|
|
#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))
|
2015-04-16 19:48:38 +00:00
|
|
|
|
2011-07-20 15:38:57 +00:00
|
|
|
#endif /* __LINUX_KCONFIG_H */
|