Commit eaeae0cc authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Linus Torvalds

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

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: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 5f44a669
......@@ -26,6 +26,7 @@
*/
.text
.section .bootstrap.text
.code32
.globl startup_32
/* %bx: 1 if coming from smp trampoline on secondary cpu */
......
......@@ -20,6 +20,7 @@ SECTIONS
phys_startup_64 = startup_64 - LOAD_OFFSET;
_text = .; /* Text and read-only data */
.text : AT(ADDR(.text) - LOAD_OFFSET) {
*(.bootstrap.text)
*(.text)
SCHED_TEXT
LOCK_TEXT
......
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