diff options
| author | Tejun Heo | 2009-01-13 12:41:35 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2009-01-16 14:20:03 +0100 |
| commit | b12d8db8fbfaed1e8222a15333a3645599636854 (patch) | |
| tree | 4ae6ce55232885d0707eb464c5b43a54bdfe3ce4 /arch/x86/include/asm/pda.h | |
| parent | x86: merge 64 and 32 SMP percpu handling (diff) | |
| download | kernel-qcow2-linux-b12d8db8fbfaed1e8222a15333a3645599636854.tar.gz kernel-qcow2-linux-b12d8db8fbfaed1e8222a15333a3645599636854.tar.xz kernel-qcow2-linux-b12d8db8fbfaed1e8222a15333a3645599636854.zip | |
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/include/asm/pda.h')
| -rw-r--r-- | arch/x86/include/asm/pda.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/pda.h b/arch/x86/include/asm/pda.h index e91558e37850..66ae1043393d 100644 --- a/arch/x86/include/asm/pda.h +++ b/arch/x86/include/asm/pda.h @@ -7,6 +7,7 @@ #include <linux/cache.h> #include <linux/threads.h> #include <asm/page.h> +#include <asm/percpu.h> /* Per processor datastructure. %gs points to it while the kernel runs */ struct x8664_pda { @@ -39,10 +40,10 @@ struct x8664_pda { unsigned irq_spurious_count; } ____cacheline_aligned_in_smp; -extern struct x8664_pda *_cpu_pda[NR_CPUS]; +DECLARE_PER_CPU(struct x8664_pda, __pda); extern void pda_init(int); -#define cpu_pda(i) (_cpu_pda[i]) +#define cpu_pda(cpu) (&per_cpu(__pda, cpu)) /* * There is no fast way to get the base address of the PDA, all the accesses |