arch/x86/include/asm/current.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_CURRENT_H
   3 #define _ASM_X86_CURRENT_H
   4
   5 #include <linux/compiler.h>
   6
   7 #ifndef __ASSEMBLY__
   8
   9 #include <linux/cache.h>
  10 #include <asm/percpu.h>
  11
  12 struct task_struct;
  13
  14 struct pcpu_hot {
  15         union {
  16                 struct {
  17                         struct task_struct      *current_task;
  18                         int                     preempt_count;
  19                         int                     cpu_number;
  20 #ifdef CONFIG_CALL_DEPTH_TRACKING
  21                         u64                     call_depth;
  22 #endif
  23                         unsigned long           top_of_stack;
  24                         void                    *hardirq_stack_ptr;
  25                         u16                     softirq_pending;
  26 #ifdef CONFIG_X86_64
  27                         bool                    hardirq_stack_inuse;
  28 #else
  29                         void                    *softirq_stack_ptr;
  30 #endif
  31                 };
  32                 u8      pad[64];
  33         };
  34 };
  35 static_assert(sizeof(struct pcpu_hot) == 64);
  36
  37 DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot);
  38
  39 static __always_inline struct task_struct *get_current(void)
  40 {
  41         return this_cpu_read_stable(pcpu_hot.current_task);
  42 }
  43
  44 #define current get_current()
  45
  46 #endif /* __ASSEMBLY__ */
  47
  48 #endif /* _ASM_X86_CURRENT_H */