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| author |   Tejun Heo <tj@kernel.org> | 2009-01-13 20:41:35 +0900 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-01-16 14:19:14 +0100 |
| commit | 3e5d8f978435bb9ba4dfe3f4514e65e7885db1a9 (patch) | |
| tree | 1ce55b2ec16a0bd59a29857e05215960d463a1d8 /include/asm-generic/sections.h | |
| parent | x86: make vmlinux_32.lds.S use PERCPU() macro (diff) | |
| download | linux-dev-3e5d8f978435bb9ba4dfe3f4514e65e7885db1a9.tar.xz linux-dev-3e5d8f978435bb9ba4dfe3f4514e65e7885db1a9.zip | |
x86: make percpu symbols zerobased on SMP
[ Based on original patch from Christoph Lameter and Mike Travis. ]
This patch makes percpu symbols zerobased on x86_64 SMP by adding
PERCPU_VADDR() to vmlinux.lds.h which helps setting explicit vaddr on
the percpu output section and using it in vmlinux_64.lds.S. A new
PHDR is added as existing ones cannot contain sections near address
zero. PERCPU_VADDR() also adds a new symbol __per_cpu_load which
always points to the vaddr of the loaded percpu data.init region.
The following adjustments have been made to accomodate the address
change.
* code to locate percpu gdt_page in head_64.S is updated to add the
load address to the gdt_page offset.
* __per_cpu_load is used in places where access to the init data area
is necessary.
* pda->data_offset is initialized soon after C code is entered as zero
value doesn't work anymore.
This patch is mostly taken from Mike Travis' "x86_64: Base percpu
variables at zero" patch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-generic/sections.h')
| -rw-r--r-- | include/asm-generic/sections.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index 79a7ff925bf8..4ce48e878530 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -9,7 +9,7 @@ extern char __bss_start[], __bss_stop[]; extern char __init_begin[], __init_end[]; extern char _sinittext[], _einittext[]; extern char _end[]; -extern char __per_cpu_start[], __per_cpu_end[]; +extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[]; extern char __kprobes_text_start[], __kprobes_text_end[]; extern char __initdata_begin[], __initdata_end[]; extern char __start_rodata[], __end_rodata[]; |