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-rw-r--r--arch/x86/include/asm/current.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
new file mode 100644
index 0000000000..a1168e7b69
--- /dev/null
+++ b/arch/x86/include/asm/current.h
@@ -0,0 +1,48 @@
+/* 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;
+#ifdef CONFIG_CALL_DEPTH_TRACKING
+ u64 call_depth;
+#endif
+ unsigned long top_of_stack;
+ void *hardirq_stack_ptr;
+ u16 softirq_pending;
+#ifdef CONFIG_X86_64
+ bool hardirq_stack_inuse;
+#else
+ void *softirq_stack_ptr;
+#endif
+ };
+ 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 */