[RFC][PATCH] kconfig: Add implicit CONFIG_ prefix to IS_ENABLED() and co

[Peter Zijlstra <peterz@infradead.org>]

Since IS_ENABLED() (and friends) are clearly meant to be used on
CONFIG_foo symbols and IS_ENABLED(CONFIG_ is so long and almost an
tautology, allow the more compact usage of: IS_ENABLED(foo).

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---

With this on, something like:

  for i in IS_BUILTIN IS_MODULE IS_REACHABLE IS_ENABLED;
  do
	git grep -wl $i | while read file;
	do
		sed -ie "s/${i}(CONFIG_/${i}(/g" $file;
        done;
  done

can be used to convert all existing instance. Allowing, after time
passes, to remove the CONFIG_ usage if so desired.

---
 tools/include/linux/kconfig.h   |    7 ++++---
 include/linux/kconfig.h         |    7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -38,6 +38,7 @@
  * 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)			__or(__is_defined(x), __is_defined(CONFIG_##x))
 #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)
@@ -47,14 +48,14 @@
  * otherwise. For boolean options, this is equivalent to
  * IS_ENABLED(CONFIG_FOO).
  */
-#define IS_BUILTIN(option) __is_defined(option)
+#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)
+#define IS_MODULE(option) _is_defined(option##_MODULE)
 
 /*
  * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled
@@ -63,7 +64,7 @@
  * 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)))
+				__and(IS_MODULE(option), _is_defined(MODULE)))
 
 /*
  * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
--- a/tools/include/linux/kconfig.h
+++ b/tools/include/linux/kconfig.h
@@ -32,6 +32,7 @@
  * 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)			__or(__is_defined(x), __is_defined(CONFIG_##x))
 #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)
@@ -41,13 +42,13 @@
  * otherwise. For boolean options, this is equivalent to
  * IS_ENABLED(CONFIG_FOO).
  */
-#define IS_BUILTIN(option) __is_defined(option)
+#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)
+#define IS_MODULE(option) _is_defined(option##_MODULE)
 
 /*
  * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled
@@ -56,7 +57,7 @@
  * 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)))
+				__and(IS_MODULE(option), _is_defined(MODULE)))
 
 /*
  * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',