[PATCH 17/23] [PATCH] x86_64: Let impossible CPUs point to reference per cpu data

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

Don't mark the reference per cpu data init data (so it stays
around after boot) and point all impossible CPUs to it. This way
they reference some valid - although shared memory. Usually
this is only initialization like INIT_LIST_HEADs and there
won't be races because these CPUs never run. Still somewhat hackish.

Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---

 arch/x86_64/kernel/vmlinux.lds.S |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

Index: linux-2.6.15.3/arch/x86_64/kernel/vmlinux.lds.S
===================================================================
--- linux-2.6.15.3.orig/arch/x86_64/kernel/vmlinux.lds.S
+++ linux-2.6.15.3/arch/x86_64/kernel/vmlinux.lds.S
@@ -170,13 +170,15 @@ SECTIONS
   . = ALIGN(4096);
   __initramfs_start = .;
   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
-  __initramfs_end = .;	
-  . = ALIGN(32);
+  __initramfs_end = .;
+  /* temporary here to work around NR_CPUS. If you see this comment in 2.6.17+
+   complain */
+  . = ALIGN(4096);	
+  __init_end = .;	
+  . = ALIGN(128);
   __per_cpu_start = .;
   .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) }
   __per_cpu_end = .;
-  . = ALIGN(4096);
-  __init_end = .;
 
   . = ALIGN(4096);
   __nosave_begin = .;

--
-
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