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[PATCH] x86_64: Patch to make the head.S-must-be-first-in-vmlinux order explicit

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This patch puts the code from head.S in a special .bootstrap.text
section.

I'm working on a patch to reorder the functions in the kernel (I'll post
that later), but for x86-64 at least the kernel bootstrap requires that
the head.S functions are on the very first page/pages of the kernel
text.  This is understandable since the bootstrap is complex enough
already and not a problem at all, it just means they aren't allowed to
be reordered.  This patch puts these special functions into a separate
section to document this, and to guarantee this in the light of possibly
reordering the rest later.

(So this patch doesn't fix a bug per se, but makes things more robust by
making the order of these functions explicit)

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Arjan van de Ven 2006-03-25 16:30:28 +01:00 committed by Linus Torvalds
parent 5f44a66980
commit eaeae0cc98
2 changed files with 2 additions and 0 deletions
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1
arch/x86_64/kernel/head.S
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@ -26,6 +26,7 @@
*/ */
.text .text
.section .bootstrap.text
.code32 .code32
.globl startup_32 .globl startup_32
/* %bx: 1 if coming from smp trampoline on secondary cpu */ /* %bx: 1 if coming from smp trampoline on secondary cpu */

1
arch/x86_64/kernel/vmlinux.lds.S
View File

@ -20,6 +20,7 @@ SECTIONS
phys_startup_64 = startup_64 - LOAD_OFFSET; phys_startup_64 = startup_64 - LOAD_OFFSET;
_text = .; /* Text and read-only data */ _text = .; /* Text and read-only data */
.text : AT(ADDR(.text) - LOAD_OFFSET) { .text : AT(ADDR(.text) - LOAD_OFFSET) {
*(.bootstrap.text)
*(.text) *(.text)
SCHED_TEXT SCHED_TEXT
LOCK_TEXT LOCK_TEXT