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49357d19e4
pda is now a percpu variable and there's no reason it can't use plain x86 percpu accessors. Add x86_test_and_clear_bit_percpu() and replace pda op implementations with wrappers around x86 percpu accessors. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#ifndef _ASM_X86_PDA_H
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#define _ASM_X86_PDA_H
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#ifndef __ASSEMBLY__
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <asm/page.h>
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#include <asm/percpu.h>
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/* Per processor datastructure. %gs points to it while the kernel runs */
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struct x8664_pda {
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struct task_struct *pcurrent; /* 0 Current process */
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unsigned long dummy;
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unsigned long kernelstack; /* 16 top of kernel stack for current */
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unsigned long oldrsp; /* 24 user rsp for system call */
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int irqcount; /* 32 Irq nesting counter. Starts -1 */
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unsigned int cpunumber; /* 36 Logical CPU number */
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#ifdef CONFIG_CC_STACKPROTECTOR
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unsigned long stack_canary; /* 40 stack canary value */
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/* gcc-ABI: this canary MUST be at
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offset 40!!! */
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#endif
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char *irqstackptr;
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short nodenumber; /* number of current node (32k max) */
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short in_bootmem; /* pda lives in bootmem */
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unsigned int __softirq_pending;
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unsigned int __nmi_count; /* number of NMI on this CPUs */
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short mmu_state;
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short isidle;
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struct mm_struct *active_mm;
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unsigned apic_timer_irqs;
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unsigned irq0_irqs;
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unsigned irq_resched_count;
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unsigned irq_call_count;
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unsigned irq_tlb_count;
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unsigned irq_thermal_count;
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unsigned irq_threshold_count;
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unsigned irq_spurious_count;
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} ____cacheline_aligned_in_smp;
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DECLARE_PER_CPU(struct x8664_pda, __pda);
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extern void pda_init(int);
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#define cpu_pda(cpu) (&per_cpu(__pda, cpu))
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#define read_pda(field) x86_read_percpu(__pda.field)
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#define write_pda(field, val) x86_write_percpu(__pda.field, val)
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#define add_pda(field, val) x86_add_percpu(__pda.field, val)
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#define sub_pda(field, val) x86_sub_percpu(__pda.field, val)
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#define or_pda(field, val) x86_or_percpu(__pda.field, val)
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/* This is not atomic against other CPUs -- CPU preemption needs to be off */
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#define test_and_clear_bit_pda(bit, field) \
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x86_test_and_clear_bit_percpu(bit, __pda.field)
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#endif
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#define PDA_STACKOFFSET (5*8)
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#endif /* _ASM_X86_PDA_H */
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