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d563d678aa0 in 2020 causes some page table corruption ot TLB invalidation
on sparc, revert for now until is further analyzed.

--- b/fs/namespace.c
+++ a/fs/namespace.c
@@ -3075,7 +3075,7 @@
 void *copy_mount_options(const void __user * data)
 {
 	char *copy;
+	unsigned size;
-	unsigned left, offset;
 
 	if (!data)
 		return NULL;
@@ -3084,27 +3084,16 @@
 	if (!copy)
 		return ERR_PTR(-ENOMEM);
 
+	size = PAGE_SIZE - offset_in_page(data);
-	left = copy_from_user(copy, data, PAGE_SIZE);
 
+	if (copy_from_user(copy, data, size)) {
-	/*
-	 * Not all architectures have an exact copy_from_user(). Resort to
-	 * byte at a time.
-	 */
-	offset = PAGE_SIZE - left;
-	while (left) {
-		char c;
-		if (get_user(c, (const char __user *)data + offset))
-			break;
-		copy[offset] = c;
-		left--;
-		offset++;
-	}
-
-	if (left == PAGE_SIZE) {
 		kfree(copy);
 		return ERR_PTR(-EFAULT);
 	}
+	if (size != PAGE_SIZE) {
+		if (copy_from_user(copy + size, data + size, PAGE_SIZE - size))
+			memset(copy + size, 0, PAGE_SIZE - size);
+	}
-
 	return copy;
 }