arch/x86/include/asm/current.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/current.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/current.h
Extension
.h
Size
761 bytes
Lines
33
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_X86_CURRENT_H
#define _ASM_X86_CURRENT_H

#include <linux/build_bug.h>
#include <linux/compiler.h>

#ifndef __ASSEMBLER__

#include <linux/cache.h>
#include <asm/percpu.h>

struct task_struct;

DECLARE_PER_CPU_CACHE_HOT(struct task_struct *, current_task);
/* const-qualified alias provided by the linker. */
DECLARE_PER_CPU_CACHE_HOT(struct task_struct * const __percpu_seg_override,
			  const_current_task);

static __always_inline struct task_struct *get_current(void)
{
	if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT))
		return this_cpu_read_const(const_current_task);

	return this_cpu_read_stable(current_task);
}

#define current get_current()

#endif /* __ASSEMBLER__ */

#endif /* _ASM_X86_CURRENT_H */

Annotation

Implementation Notes