diff options
Diffstat (limited to 'arch/x86/include/asm/current.h')
| -rw-r--r-- | arch/x86/include/asm/current.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h index a1168e7b69e5..bf5953883ec3 100644 --- a/arch/x86/include/asm/current.h +++ b/arch/x86/include/asm/current.h @@ -2,6 +2,7 @@ #ifndef _ASM_X86_CURRENT_H #define _ASM_X86_CURRENT_H +#include <linux/build_bug.h> #include <linux/compiler.h> #ifndef __ASSEMBLY__ @@ -17,7 +18,7 @@ struct pcpu_hot { struct task_struct *current_task; int preempt_count; int cpu_number; -#ifdef CONFIG_CALL_DEPTH_TRACKING +#ifdef CONFIG_MITIGATION_CALL_DEPTH_TRACKING u64 call_depth; #endif unsigned long top_of_stack; @@ -36,8 +37,15 @@ static_assert(sizeof(struct pcpu_hot) == 64); DECLARE_PER_CPU_ALIGNED(struct pcpu_hot, pcpu_hot); +/* const-qualified alias to pcpu_hot, aliased by linker. */ +DECLARE_PER_CPU_ALIGNED(const struct pcpu_hot __percpu_seg_override, + const_pcpu_hot); + static __always_inline struct task_struct *get_current(void) { + if (IS_ENABLED(CONFIG_USE_X86_SEG_SUPPORT)) + return this_cpu_read_const(const_pcpu_hot.current_task); + return this_cpu_read_stable(pcpu_hot.current_task); } |