diff --git a/Documentation/mm/dynamic-memory-consistency-model.rst b/Documentation/mm/dynamic-memory-consistency-model.rst
new file mode 100644
index 000000000000..21675b41ec84
--- /dev/null
+++ b/Documentation/mm/dynamic-memory-consistency-model.rst
@@ -0,0 +1,58 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+================================
+Dynamic memory consistency model
+================================
+
+This document gives an overview of the userspace interface to change memory
+consistency model at run-time.
+
+
+What is a memory consistency model?
+===================================
+
+The memory consistency model is a set of guarantees a CPU architecture
+provides about (re-)ordering memory accesses. Each architecture defines
+its own model and set of rules within that, which are carefully specified.
+The provided guarantees have consequences for the microarchitectures (e.g.,
+some memory consistency models allow reordering stores after loads) and
+the software executed within this model (memory consistency models that
+allow reordering memory accesses provide memory barrier instructions
+to enforce additional guarantees when needed explicitly).
+
+Details about the architecture-independent memory consistency model abstraction
+in the Linux kernel and the use of the different types of memory barriers
+can be found here:
+
+	Documentation/memory-barriers.txt
+
+Two models can be in a weaker/stronger relation. I.e., a consistency
+model A is weaker/stronger than another model B if A provides a subset/superset
+of the constraints that B provides.
+
+Some architectures define more than one memory consistency model.
+On such architectures, switching the memory consistency model at run-time
+to a stronger one is possible because software written for the weaker model is
+compatible with the constraints of the stronger model.
+
+If two models are not in a weaker/stronger relation, switching between
+them will violate the consistency assumptions that the software was
+written under (i.e., causing subtle bugs that are very hard to debug).
+
+User API via prctl
+==================
+
+Two prctl calls are defined to get/set the active memory consistency model:
+
+* prctl(PR_GET_MEMORY_CONSISTENCY_MODEL)
+
+    Returns the active memory consistency model for the calling process/thread.
+    If the architecture does not support dynamic memory consistency models,
+    then -1 is returned, and errno is set to EINVAL.
+
+* prctl(PR_SET_MEMORY_CONSISTENCY_MODEL, unsigned long new_model)
+
+    Switches the memory consistency model for the calling process/thread
+    to the given model. If the architecture does not support dynamic
+    memory consistency models or does not support the provided model, then
+    -1 is returned, and errno is set to EINVAL.
diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
index 370ed14b1ae0..579662731eaa 100644
--- a/include/uapi/linux/prctl.h
+++ b/include/uapi/linux/prctl.h
@@ -306,4 +306,7 @@ struct prctl_mm_map {
 # define PR_RISCV_V_VSTATE_CTRL_NEXT_MASK	0xc
 # define PR_RISCV_V_VSTATE_CTRL_MASK		0x1f
 
+#define PR_SET_MEMORY_CONSISTENCY_MODEL		71
+#define PR_GET_MEMORY_CONSISTENCY_MODEL		72
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/kernel/sys.c b/kernel/sys.c
index e219fcfa112d..a8a217a10767 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -146,6 +146,12 @@
 #ifndef RISCV_V_GET_CONTROL
 # define RISCV_V_GET_CONTROL()		(-EINVAL)
 #endif
+#ifndef SET_MEMORY_CONSISTENCY_MODEL
+# define SET_MEMORY_CONSISTENCY_MODEL	(-EINVAL)
+#endif
+#ifndef GET_MEMORY_CONSISTENCY_MODEL
+# define GET_MEMORY_CONSISTENCY_MODEL	(-EINVAL)
+#endif
 
 /*
  * this is where the system-wide overflow UID and GID are defined, for
@@ -2743,6 +2749,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 	case PR_RISCV_V_GET_CONTROL:
 		error = RISCV_V_GET_CONTROL();
 		break;
+	case PR_SET_MEMORY_CONSISTENCY_MODEL:
+		error = SET_MEMORY_CONSISTENCY_MODEL(arg2);
+		break;
+	case PR_GET_MEMORY_CONSISTENCY_MODEL:
+		error = GET_MEMORY_CONSISTENCY_MODEL();
+		break;
 	default:
 		error = -EINVAL;
 		break;
