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

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Hack for 2.6.16. In 2.6.17 all code that uses NR_CPUs should
be audited and changed to only touch possible CPUs.

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: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-02-03 21:51:56 +01:00 committed by Linus Torvalds
parent 3777a95903
commit 14c3f85587
1 changed files with 5 additions and 3 deletions
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8
arch/x86_64/kernel/vmlinux.lds.S
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@ -172,13 +172,15 @@ SECTIONS
. = ALIGN(4096); . = ALIGN(4096);
__initramfs_start = .; __initramfs_start = .;
.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) } .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
__initramfs_end = .; __initramfs_end = .;
/* temporary here to work around NR_CPUS. If you see this comment in 2.6.17+
complain */
. = ALIGN(4096);
__init_end = .;
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES); . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
__per_cpu_start = .; __per_cpu_start = .;
.data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) } .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) }
__per_cpu_end = .; __per_cpu_end = .;
. = ALIGN(4096);
__init_end = .;
. = ALIGN(4096); . = ALIGN(4096);
__nosave_begin = .; __nosave_begin = .;