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