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| author | Tejun Heo | 2009-01-13 12:41:35 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2009-01-16 14:19:58 +0100 |
| commit | 9939ddaff52787b2a7c1adf1b2afc95421aa0884 (patch) | |
| tree | 6e7266d065914e19c3c3f4b4e475f09b9669fa51 /arch/x86/include/asm/pda.h | |
| parent | x86: fold pda into percpu area on SMP (diff) | |
| download | kernel-qcow2-linux-9939ddaff52787b2a7c1adf1b2afc95421aa0884.tar.gz kernel-qcow2-linux-9939ddaff52787b2a7c1adf1b2afc95421aa0884.tar.xz kernel-qcow2-linux-9939ddaff52787b2a7c1adf1b2afc95421aa0884.zip | |
x86: merge 64 and 32 SMP percpu handling
Now that pda is allocated as part of percpu, percpu doesn't need to be
accessed through pda. Unify x86_64 SMP percpu access with x86_32 SMP
one. Other than the segment register, operand size and the base of
percpu symbols, they behave identical now.
This patch replaces now unnecessary pda->data_offset with a dummy
field which is necessary to keep stack_canary at its place. This
patch also moves per_cpu_offset initialization out of init_gdt() into
setup_per_cpu_areas(). Note that this change also necessitates
explicit per_cpu_offset initializations in voyager_smp.c.
With this change, x86_OP_percpu()'s are as efficient on x86_64 as on
x86_32 and also x86_64 can use assembly PER_CPU macros.
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 | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/include/asm/pda.h b/arch/x86/include/asm/pda.h index 2d5b49c3248e..e91558e37850 100644 --- a/arch/x86/include/asm/pda.h +++ b/arch/x86/include/asm/pda.h @@ -11,8 +11,7 @@ /* Per processor datastructure. %gs points to it while the kernel runs */ struct x8664_pda { struct task_struct *pcurrent; /* 0 Current process */ - unsigned long data_offset; /* 8 Per cpu data offset from linker - address */ + unsigned long dummy; unsigned long kernelstack; /* 16 top of kernel stack for current */ unsigned long oldrsp; /* 24 user rsp for system call */ int irqcount; /* 32 Irq nesting counter. Starts -1 */ |