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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 14:20:03 +0100 |
| commit | b12d8db8fbfaed1e8222a15333a3645599636854 (patch) | |
| tree | 4ae6ce55232885d0707eb464c5b43a54bdfe3ce4 /arch/x86/kernel/vmlinux_64.lds.S | |
| parent | 9939ddaff52787b2a7c1adf1b2afc95421aa0884 (diff) | |
| download | op-kernel-dev-b12d8db8fbfaed1e8222a15333a3645599636854.zip op-kernel-dev-b12d8db8fbfaed1e8222a15333a3645599636854.tar.gz | |
x86: make pda a percpu variable
[ Based on original patch from Christoph Lameter and Mike Travis. ]
As pda is now allocated in percpu area, it can easily be made a proper
percpu variable. Make it so by defining per cpu symbol from linker
script and declaring it in C code for SMP and simply defining it for
UP. This change cleans up code and brings SMP and UP closer a bit.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/vmlinux_64.lds.S')
| -rw-r--r-- | arch/x86/kernel/vmlinux_64.lds.S | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S index 962f21f..d2a0baa 100644 --- a/arch/x86/kernel/vmlinux_64.lds.S +++ b/arch/x86/kernel/vmlinux_64.lds.S @@ -217,10 +217,12 @@ SECTIONS * percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the * output PHDR, so the next output section - __data_nosave - should * switch it back to data.init. Also, pda should be at the head of - * percpu area. Preallocate it. + * percpu area. Preallocate it and define the percpu offset symbol + * so that it can be accessed as a percpu variable. */ . = ALIGN(PAGE_SIZE); PERCPU_VADDR_PREALLOC(0, :percpu, pda_size) + per_cpu____pda = __per_cpu_start; #else PERCPU(PAGE_SIZE) #endif |
