57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_CURRENT_H
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#define _ASM_X86_CURRENT_H
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#include <linux/build_bug.h>
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#include <linux/compiler.h>
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#ifndef __ASSEMBLY__
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#include <linux/cache.h>
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#include <asm/percpu.h>
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struct task_struct;
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struct pcpu_hot {
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union {
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struct {
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struct task_struct *current_task;
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int preempt_count;
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int cpu_number;
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#ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING
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u64 call_depth;
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#endif
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unsigned long top_of_stack;
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void *hardirq_stack_ptr;
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u16 softirq_pending;
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#ifdef CONFIG_X86_64
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bool hardirq_stack_inuse;
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#else
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void *softirq_stack_ptr;
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#endif
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};
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u8 pad[64];
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};
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};
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static_assert(sizeof(struct pcpu_hot) == 64);
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DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
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/* const-qualified alias to pcpu_hot, aliased by linker. */
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DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override,
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const_pcpu_hot);
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static __always_inline struct task_struct *get_current(void)
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{
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if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT))
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return this_cpu_read_const(const_pcpu_hot.current_task);
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return this_cpu_read_stable(pcpu_hot.current_task);
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}
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#define current get_current()
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_CURRENT_H */
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