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>

3 files changed, 5 insertions, 11 deletions

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 7ffec6b3b331..64ad7696786f 100644
--- a/arch/x86/kernel/head_32.S
+++ b/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 */
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index fa54f78e2a05..26406601031c 100644
--- a/arch/x86/kernel/head_64.S
+++ b/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:
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index b96ca472fa26..5c7826dd804b 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/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