[PATCH] linux/init.h: Always omit __exit code and data for in-kernel compilation

[Josh Triplett]

__exit code and data only exists for module removal; when compiling such
code in the kernel, omit the __exit functions to save space.  For x86
defconfig this saves about 9k, and significantly more in the compiled
binary size.

Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
 include/linux/init.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 2df8e8d..daa329d 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -42,8 +42,14 @@
 #define __init		__section(.init.text) __cold notrace
 #define __initdata	__section(.init.data)
 #define __initconst	__constsection(.init.rodata)
+
+#ifdef MODULE
 #define __exitdata	__section(.exit.data)
 #define __exit_call	__used __section(.exitcall.exit)
+#else
+#define __exitdata	__always_unused
+#define __exit_call	__always_unused
+#endif
 
 /*
  * Some architecture have tool chains which do not handle rodata attributes
@@ -89,7 +95,11 @@
 #define __exitused  __used
 #endif
 
-#define __exit          __section(.exit.text) __exitused __cold notrace
+#ifdef MODULE
+#define __exit          __section(.exit.text) __cold notrace
+#else
+#define __exit          __always_unused
+#endif
 
 /* temporary, until all users are removed */
 #define __cpuinit
-- 
2.1.1

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