178344Sobrien/* SPDX-License-Identifier: GPL-2.0 */ 278344Sobrien#ifndef _ASM_X86_CURRENT_H 398184Sgordon#define _ASM_X86_CURRENT_H 478344Sobrien 578344Sobrien#include <linux/build_bug.h> 678344Sobrien#include <linux/compiler.h> 7240336Sobrien 8114735Smtm#ifndef __ASSEMBLY__ 9136224Smtm 1078344Sobrien#include <linux/cache.h> 1178344Sobrien#include <asm/percpu.h> 1278344Sobrien 1378344Sobrienstruct task_struct; 14230099Sdougb 1578344Sobrienstruct pcpu_hot { 1678344Sobrien union { 1778344Sobrien struct { 1878344Sobrien struct task_struct *current_task; 19123841Sbabkin int preempt_count; 20123841Sbabkin int cpu_number; 21123841Sbabkin#ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING 22123841Sbabkin u64 call_depth; 2378344Sobrien#endif 24 unsigned long top_of_stack; 25 void *hardirq_stack_ptr; 26 u16 softirq_pending; 27#ifdef CONFIG_X86_64 28 bool hardirq_stack_inuse; 29#else 30 void *softirq_stack_ptr; 31#endif 32 }; 33 u8 pad[64]; 34 }; 35}; 36static_assert(sizeof(struct pcpu_hot) == 64); 37 38DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot); 39 40/* const-qualified alias to pcpu_hot, aliased by linker. */ 41DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override, 42 const_pcpu_hot); 43 44static __always_inline struct task_struct *get_current(void) 45{ 46 if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT)) 47 return this_cpu_read_const(const_pcpu_hot.current_task); 48 49 return this_cpu_read_stable(pcpu_hot.current_task); 50} 51 52#define current get_current() 53 54#endif /* __ASSEMBLY__ */ 55 56#endif /* _ASM_X86_CURRENT_H */ 57