diff --git a/arch/s390/include/asm/set_memory.h b/arch/s390/include/asm/set_memory.h
index 9f6c329a0d4e..06fbabe2f66c 100644
--- a/arch/s390/include/asm/set_memory.h
+++ b/arch/s390/include/asm/set_memory.h
@@ -24,14 +24,32 @@ enum {
 #define SET_MEMORY_INV	BIT(_SET_MEMORY_INV_BIT)
 #define SET_MEMORY_DEF	BIT(_SET_MEMORY_DEF_BIT)
 
-int __set_memory(unsigned long addr, int numpages, unsigned long flags);
+int __set_memory(unsigned long addr, unsigned long numpages, unsigned long flags);
 
 #define set_memory_rox set_memory_rox
 
-#define __SET_MEMORY_FUNC(fname, flags)				\
-static inline int fname(unsigned long addr, int numpages)	\
-{								\
-	return __set_memory(addr, numpages, (flags));		\
+/*
+ * Generate two variants of each set_memory() function:
+ *
+ * set_memory_yy(unsigned long addr, int numpages);
+ * __set_memory_yy(void *start, void *end);
+ *
+ * The second variant exists for both convenience to avoid the usual
+ * (unsigned long) casts, but unlike the first variant it can also be used
+ * for areas larger than 8TB, which may happen at memory initialization.
+ */
+#define __SET_MEMORY_FUNC(fname, flags)					\
+static inline int fname(unsigned long addr, int numpages)		\
+{									\
+	return __set_memory(addr, numpages, (flags));			\
+}									\
+									\
+static inline int __##fname(void *start, void *end)			\
+{									\
+	unsigned long numpages;						\
+									\
+	numpages = (end - start) >> PAGE_SHIFT;				\
+	return __set_memory((unsigned long)start, numpages, (flags));	\
 }
 
 __SET_MEMORY_FUNC(set_memory_ro, SET_MEMORY_RO)
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index ca5a418c58a8..43c919c7bafb 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -373,7 +373,7 @@ static int change_page_attr_alias(unsigned long addr, unsigned long end,
 	return rc;
 }
 
-int __set_memory(unsigned long addr, int numpages, unsigned long flags)
+int __set_memory(unsigned long addr, unsigned long numpages, unsigned long flags)
 {
 	unsigned long end;
 	int rc;