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[PATCH] i386: Implement "current" with the PDA

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Use the pcurrent field in the PDA to implement the "current" macro.  This ends
up compiling down to a single instruction to get the current task.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Jeremy Fitzhardinge
2006-12-07 02:14:03 +01:00
committed by Andi Kleen
parent b2938f8808
commit ec7fcaabbf
5 changed files with 11 additions and 3 deletions
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2
arch/i386/kernel/cpu/common.c
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@@ -651,6 +651,7 @@ __cpuinit int alloc_gdt(int cpu)
struct i386_pda boot_pda = {
._pda = &boot_pda,
.cpu_number = 0,
.pcurrent = &init_task,
};
static inline void set_kernel_gs(void)
@@ -696,6 +697,7 @@ __cpuinit int init_gdt(int cpu, struct task_struct *idle)
memset(pda, 0, sizeof(*pda));
pda->_pda = pda;
pda->cpu_number = cpu;
pda->pcurrent = idle;
return 1;
}