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-rw-r--r--arch/arm64/include/asm/stacktrace.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 4c68d8a81988..92ddb6d25cf3 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -57,4 +57,20 @@ static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp)
return (low <= sp && sp < high);
}
+/*
+ * We can only safely access per-cpu stacks from current in a non-preemptible
+ * context.
+ */
+static inline bool on_accessible_stack(struct task_struct *tsk, unsigned long sp)
+{
+ if (on_task_stack(tsk, sp))
+ return true;
+ if (tsk != current || preemptible())
+ return false;
+ if (on_irq_stack(sp))
+ return true;
+
+ return false;
+}
+
#endif /* __ASM_STACKTRACE_H */