[PATCH] Make CONFIG_REGPARM enabled by default

Make CONFIG_REGPARM enabled by default.  It's a noticable win both for size
and for performance, and gcc[34] handles it correctly.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/Kconfig

@@ -661,9 +661,17 @@ config BOOT_IOREMAP
 
 config REGPARM
 	bool "Use register arguments"
+	default y
 	help
-	Compile the kernel with -mregparm=3. This uses a different ABI
-	and passes the first three arguments of a function call in registers.
+	Compile the kernel with -mregparm=3. This instructs gcc to use
+	a more efficient function call ABI which passes the first three
+	arguments of a function call via registers, which results in denser
+	and faster code.
+
+	If this option is disabled, then the default ABI of passing
+	arguments via the stack is used.
+
+	If unsure, say Y.
 
 config SECCOMP
 	bool "Enable seccomp to safely compute untrusted bytecode"