From: Andi Kleen <ak@suse.de>
Date: Mon, 6 Feb 2006 23:18:55 +0000 (+0100)
Subject: [PATCH] x86_64: Let impossible CPUs point to reference per cpu data
X-Git-Tag: v2.6.15.4~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61572d33e60ea237051a99f8effafadfdd91ac4f;p=thirdparty%2Fkernel%2Fstable.git

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

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@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index 58b19215b4b3a..6535b363985be 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/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 = .;