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-rw-r--r--Documentation/feature-removal-schedule.txt9
-rw-r--r--include/linux/compiler-gcc4.h9
-rw-r--r--lib/Kconfig.debug14
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 9474501dd6cc..b4a1ea762698 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -123,6 +123,15 @@ Who: Christoph Hellwig <hch@lst.de>
---------------------------
+What: CONFIG_FORCED_INLINING
+When: June 2006
+Why: Config option is there to see if gcc is good enough. (in january
+ 2006). If it is, the behavior should just be the default. If it's not,
+ the option should just go away entirely.
+Who: Arjan van de Ven
+
+---------------------------
+
What: START_ARRAY ioctl for md
When: July 2006
Files: drivers/md/md.c
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 8249115a1f73..6f5cc6f0e7a6 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -3,6 +3,15 @@
/* These definitions are for GCC v4.x. */
#include <linux/compiler-gcc.h>
+#ifdef CONFIG_FORCED_INLINING
+# undef inline
+# undef __inline__
+# undef __inline
+# define inline inline __attribute__((always_inline))
+# define __inline__ __inline__ __attribute__((always_inline))
+# define __inline __inline __attribute__((always_inline))
+#endif
+
#define __attribute_used__ __attribute__((__used__))
#define __must_check __attribute__((warn_unused_result))
#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a609235a517f..a314e663d517 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -195,6 +195,20 @@ config FRAME_POINTER
some architectures or if you use external debuggers.
If you don't debug the kernel, you can say N.
+config FORCED_INLINING
+ bool "Force gcc to inline functions marked 'inline'"
+ depends on DEBUG_KERNEL
+ default y
+ help
+ This option determines if the kernel forces gcc to inline the functions
+ developers have marked 'inline'. Doing so takes away freedom from gcc to
+ do what it thinks is best, which is desirable for the gcc 3.x series of
+ compilers. The gcc 4.x series have a rewritten inlining algorithm and
+ disabling this option will generate a smaller kernel there. Hopefully
+ this algorithm is so good that allowing gcc4 to make the decision can
+ become the default in the future, until then this option is there to
+ test gcc for this.
+
config RCU_TORTURE_TEST
tristate "torture tests for RCU"
depends on DEBUG_KERNEL