s390/mm: implement set_memory_rwnx()

Given that set_memory_rox() is implemented, provide also set_memory_rwnx().
This allows to get rid of all open coded __set_memory() usages in s390
architecture code.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/set_memory.h

@@ -40,6 +40,11 @@ static inline int set_memory_rox(unsigned long addr, int numpages)
 	return __set_memory(addr, numpages, SET_MEMORY_RO | SET_MEMORY_X);
 }
 
+static inline int set_memory_rwnx(unsigned long addr, int numpages)
+{
+	return __set_memory(addr, numpages, SET_MEMORY_RW | SET_MEMORY_NX);
+}
+
 static inline int set_memory_4k(unsigned long addr, int numpages)
 {
 	return __set_memory(addr, numpages, SET_MEMORY_4K);