alpha: convert to use __HEAD and HEAD_TEXT macros.

This has the consequence of changing the section name use for head
code from ".text.head" to ".head.text".  Since this commit changes all
users in the architecture, this change should be harmless.
Signed-off-by: Tim Abbott <tabbott@mit.edu>
Cc: Richard Henderson <rth@twiddle.net>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/kernel/head.S

@@ -7,10 +7,11 @@
  * the kernel global pointer and jump to the kernel entry-point.
  */
 
+#include <linux/init.h>
 #include <asm/system.h>
 #include <asm/asm-offsets.h>
 
-.section .text.head, "ax"
+__HEAD
 .globl swapper_pg_dir
 .globl _stext
 swapper_pg_dir=SWAPPER_PGD

arch/alpha/kernel/vmlinux.lds.S

@@ -16,7 +16,7 @@ SECTIONS
 
 	_text = .;	/* Text and read-only data */
 	.text : {
-	*(.text.head)
+		HEAD_TEXT
 		TEXT_TEXT
 		SCHED_TEXT
 		LOCK_TEXT