[linux-2.6-block.git] / arch / x86 / include / asm / current.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_CURRENT_H
#define _ASM_X86_CURRENT_H

#include <linux/compiler.h>

#ifndef __ASSEMBLY__

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

struct task_struct;

struct pcpu_hot {
	union {
		struct {
			struct task_struct	*current_task;
			int			preempt_count;
			int			cpu_number;
			unsigned long		top_of_stack;
		};
		u8	pad[64];
	};
};
static_assert(sizeof(struct pcpu_hot) == 64);

DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);

static __always_inline struct task_struct *get_current(void)
{
	return this_cpu_read_stable(pcpu_hot.current_task);
}

#define current get_current()

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_CURRENT_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_CURRENT_H
1965aae3 PA	3	#define _ASM_X86_CURRENT_H
f0766440	4
f0766440	5	#include <linux/compiler.h>
f0766440	6
c6f5e0ac	7	#ifndef __ASSEMBLY__
e57ef2ed TG	8
	9	#include <linux/cache.h>
	10	#include <asm/percpu.h>
	11
f0766440 CL	12	struct task_struct;
f0766440 CL	13
e57ef2ed TG	14	struct pcpu_hot {
	15	union {
	16	struct {
	17	struct task_struct *current_task;
64701838	18	int preempt_count;
7443b296	19	int cpu_number;
c063a217	20	unsigned long top_of_stack;
e57ef2ed TG	21	};
	22	u8 pad[64];
	23	};
	24	};
	25	static_assert(sizeof(struct pcpu_hot) == 64);
	26
	27	DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
f0766440 CL	28
	29	static __always_inline struct task_struct *get_current(void)
	30	{
e57ef2ed	31	return this_cpu_read_stable(pcpu_hot.current_task);
f0766440 CL	32	}
f0766440 CL	33
c6f5e0ac	34	#define current get_current()
f0766440 CL	35
	36	#endif /* __ASSEMBLY__ */
	37
1965aae3	38	#endif /* _ASM_X86_CURRENT_H */