diff --git a/Documentation/arch/arm64/memory-tagging-extension.rst b/Documentation/arch/arm64/memory-tagging-extension.rst
index e6fe428f0e2a..1d32fc5df183 100644
--- a/Documentation/arch/arm64/memory-tagging-extension.rst
+++ b/Documentation/arch/arm64/memory-tagging-extension.rst
@@ -208,11 +208,10 @@ will use the corresponding aligned address.
   tracer's space cannot be accessed or does not have valid tags.
 - ``-EPERM`` - the specified process cannot be traced.
 - ``-EIO`` - the tracee's address range cannot be accessed (e.g. invalid
-  address) and no tags copied. ``iov_len`` not updated.
+  address) or does not have valid tags (not mapped with the ``PROT_MTE``
+  flag) and no tags copied. ``iov_len`` not updated.
 - ``-EFAULT`` - fault on accessing the tracer's memory (``struct iovec``
   or ``iov_base`` buffer) and no tags copied. ``iov_len`` not updated.
-- ``-EOPNOTSUPP`` - the tracee's address does not have valid tags (never
-  mapped with the ``PROT_MTE`` flag). ``iov_len`` not updated.
 
 **Note**: There are no transient errors for the requests above, so user
 programs should not retry in case of a non-zero system call return.
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 1a9aad6ef22a..31f5c6b0510e 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -476,7 +476,7 @@ static int __access_remote_tags(struct mm_struct *mm, unsigned long addr,
 		 * was never mapped with PROT_MTE.
 		 */
 		if (!(vma->vm_flags & VM_MTE)) {
-			err = -EOPNOTSUPP;
+			err = -EIO;
 			put_page(page);
 			break;
 		}