| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _ASM_X86_CURRENT_H |
| 3 | #define _ASM_X86_CURRENT_H |
| 4 | |
| 5 | #include <linux/build_bug.h> |
| 6 | #include <linux/compiler.h> |
| 7 | |
| 8 | #ifndef __ASSEMBLY__ |
| 9 | |
| 10 | #include <linux/cache.h> |
| 11 | #include <asm/percpu.h> |
| 12 | |
| 13 | struct task_struct; |
| 14 | |
| 15 | struct pcpu_hot { |
| 16 | union { |
| 17 | struct { |
| 18 | struct task_struct *current_task; |
| 19 | int preempt_count; |
| 20 | int cpu_number; |
| 21 | #ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING |
| 22 | u64 call_depth; |
| 23 | #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 | }; |
| 36 | static_assert(sizeof(struct pcpu_hot) == 64); |
| 37 | |
| 38 | DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot); |
| 39 | |
| 40 | /* const-qualified alias to pcpu_hot, aliased by linker. */ |
| 41 | DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override, |
| 42 | const_pcpu_hot); |
| 43 | |
| 44 | static __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 |