[added,to,the,4.1,stable,tree] kconfig.h: use __is_defined() to check if MODULE is defined

Message ID 20180301152116.1486-178-alexander.levin@microsoft.com
State New
Headers show
Series
  • [added,to,the,4.1,stable,tree] kconfig.h: use __is_defined() to check if MODULE is defined
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Commit Message

Sasha Levin March 1, 2018, 3:24 p.m.
From: Masahiro Yamada <yamada.masahiro@socionext.com>


This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

-- 
2.14.1

Patch

===============

[ Upstream commit 4f920843d248946545415c1bf6120942048708ed ]

The macro MODULE is not a config option, it is a per-file build
option.  So, config_enabled(MODULE) is not sensible.  (There is
another case in include/linux/export.h, where config_enabled() is
used against a non-config option.)

This commit renames some macros in include/linux/kconfig.h for the
use for non-config macros and replaces config_enabled(MODULE) with
__is_defined(MODULE).

I am keeping config_enabled() because it is still referenced from
some places, but I expect it would be deprecated in the future.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 include/linux/kconfig.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
index b33c7797eb57..a94b5bf57f51 100644
--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -17,10 +17,11 @@ 
  * the last step cherry picks the 2nd arg, we get a zero.
  */
 #define __ARG_PLACEHOLDER_1 0,
-#define config_enabled(cfg) _config_enabled(cfg)
-#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
-#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
-#define ___config_enabled(__ignored, val, ...) val
+#define config_enabled(cfg)		___is_defined(cfg)
+#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)
+#define __take_second_arg(__ignored, val, ...) val
 
 /*
  * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
@@ -42,7 +43,7 @@ 
  * built-in code when CONFIG_FOO is set to 'm'.
  */
 #define IS_REACHABLE(option) (config_enabled(option) || \
-		 (config_enabled(option##_MODULE) && config_enabled(MODULE)))
+		 (config_enabled(option##_MODULE) && __is_defined(MODULE)))
 
 /*
  * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',