26f80bd6a9
Move the irqstackptr variable from the PDA to per-cpu. Make the
stacks themselves per-cpu, removing some specific allocation code.
Add a seperate flag (is_boot_cpu) to simplify the per-cpu boot
adjustments.
tj: * sprinkle some underbars around.
* irq_stack_ptr is not used till traps_init(), no reason to
initialize it early. On SMP, just leaving it NULL till proper
initialization in setup_per_cpu_areas() works. Dropped
is_boot_cpu and early irq_stack_ptr initialization.
* do DECLARE/DEFINE_PER_CPU(char[IRQ_STACK_SIZE], irq_stack)
instead of (char, irq_stack[IRQ_STACK_SIZE]).
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
49 lines
1.5 KiB
C
49 lines
1.5 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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short nodenumber; /* number of current node (32k max) */
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short in_bootmem; /* pda lives in bootmem */
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short isidle;
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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) percpu_read(__pda.field)
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#define write_pda(field, val) percpu_write(__pda.field, val)
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#define add_pda(field, val) percpu_add(__pda.field, val)
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#define sub_pda(field, val) percpu_sub(__pda.field, val)
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#define or_pda(field, val) percpu_or(__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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