x86: 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".  It also eliminates the
".text.head" output section (instead placing head code at the start of
the .text output section), which should be harmless.

This patch only changes the sections in the actual kernel, not those
in the compressed boot loader.

Signed-off-by: Tim Abbott <tabbott@ksplice.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/head_32.S

@@ -79,7 +79,7 @@ RESERVE_BRK(pagetables, INIT_MAP_SIZE)
  * any particular GDT layout, because we load our own as soon as we
  * can.
  */
-.section .text.head,"ax",@progbits
+__HEAD
 ENTRY(startup_32)
 	/* test KEEP_SEGMENTS flag to see if the bootloader is asking
 		us to not reload segments */

arch/x86/kernel/head_64.S

@@ -40,7 +40,7 @@ L4_START_KERNEL = pgd_index(__START_KERNEL_map)
 L3_START_KERNEL = pud_index(__START_KERNEL_map)
 
 	.text
-	.section .text.head
+	__HEAD
 	.code64
 	.globl startup_64
 startup_64:

arch/x86/kernel/vmlinux.lds.S

@@ -65,17 +65,11 @@ SECTIONS
 #endif
 
 	/* Text and read-only data */
-
-	/* bootstrapping code */
-	.text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
-		_text = .;
-		*(.text.head)
-	} :text = 0x9090
-
-	/* The rest of the text */
 	.text :  AT(ADDR(.text) - LOAD_OFFSET) {
+		_text = .;
+		/* bootstrapping code */
+		HEAD_TEXT
 #ifdef CONFIG_X86_32
-		/* not really needed, already page aligned */
 		. = ALIGN(PAGE_SIZE);
 		*(.text.page_aligned)
 #endif