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Subject[PATCH] x86_64: Overlapping program headers in physical addr space fix
Hi Andi,

Can you please apply following patch. Magnus verified that it fixed
his problem.

o A recent change to vmlinux.ld.S file broke kexec as now resulting vmlinux
program headers are overlapping in physical address space.

o Now all the vsyscall related sections are placed after data and after
that mostly init data sections are placed. To avoid physical overlap
among phdrs, there are three possible solutions.
- Place vsyscall sections also in data phdrs instead of user
- move vsyscal sections after init data in bss.
- create another phdrs say data.init and move all the sections
after vsyscall into this new phdr.

o This patch implements the third solution.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
---
arch/x86_64/kernel/vmlinux.lds.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/vmlinux.lds.S~x86_64-physical-addr-space-overlap-in-phdrs-fix arch/x86_64/kernel/vmlinux.lds.S
--- linux-2.6.19-rc1-1M/arch/x86_64/kernel/vmlinux.lds.S~x86_64-physical-addr-space-overlap-in-phdrs-fix 2006-10-05 12:15:00.000000000 -0400
+++ linux-2.6.19-rc1-1M-root/arch/x86_64/kernel/vmlinux.lds.S 2006-10-05 12:15:00.000000000 -0400
@@ -17,6 +17,7 @@ PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */
user PT_LOAD FLAGS(7); /* RWE */
+ data.init PT_LOAD FLAGS(7); /* RWE */
note PT_NOTE FLAGS(4); /* R__ */
}
SECTIONS
@@ -131,7 +132,7 @@ SECTIONS
. = ALIGN(8192); /* init_task */
.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
*(.data.init_task)
- } :data
+ }:data.init

. = ALIGN(4096);
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
_
-
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