s390/setup: always inline gen_lpswe()

gen_lpswe() contains a BUILD_BUG_ON() statement which depends on a function
parameter. If the compiler decides to generate a not inlined function this
will lead to a build error, even if all call sites pass a valid parameter.

To avoid this always inline gen_lpswe().
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/setup.h

@@ -164,7 +164,7 @@ struct oldmem_data {
 };
 extern struct oldmem_data oldmem_data;
 
-static inline u32 gen_lpswe(unsigned long addr)
+static __always_inline u32 gen_lpswe(unsigned long addr)
 {
 	BUILD_BUG_ON(addr > 0xfff);
 	return 0xb2b20000 | addr;