s390/alternatives: make use of asm_inline

This is the s390 version of commit 40576e5e63ea ("x86: alternative.h:
use asm_inline for all alternative variants").

See commit eb111869301e ("compiler-types.h: add asm_inline
definition") for more details.

With this change the compiler will not generate many out-of-line
versions for the three instruction sized arch_spin_unlock() function
anymore. Due to this gcc seems to change a lot of other inline
decisions which results in a net 6k text size growth according to
bloat-o-meter (gcc 9.2 with defconfig).
But that's still better than having many out-of-line versions of
arch_spin_unlock().

Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

arch/s390/include/asm/alternative.h

···
  * without volatile and memory clobber.
  */
 #define alternative(oldinstr, altinstr, facility)			\
-	asm volatile(ALTERNATIVE(oldinstr, altinstr, facility) : : : "memory")
+	asm_inline volatile(ALTERNATIVE(oldinstr, altinstr, facility) : : : "memory")
 
 #define alternative_2(oldinstr, altinstr1, facility1, altinstr2, facility2) \
-	asm volatile(ALTERNATIVE_2(oldinstr, altinstr1, facility1,	    \
+	asm_inline volatile(ALTERNATIVE_2(oldinstr, altinstr1, facility1,   \
 				   altinstr2, facility2) ::: "memory")
 
 #endif /* __ASSEMBLY__ */

arch/s390/include/asm/spinlock.h

···
 static inline void arch_spin_unlock(arch_spinlock_t *lp)
 {
 	typecheck(int, lp->lock);
-	asm volatile(
+	asm_inline volatile(
 		ALTERNATIVE("", ".long 0xb2fa0070", 49)	/* NIAI 7 */
 		"	sth	%1,%0\n"
 		: "=Q" (((unsigned short *) &lp->lock)[1])

arch/s390/lib/spinlock.c

···
 {
 	int owner;
 
-	asm volatile(
+	asm_inline volatile(
 		ALTERNATIVE("", ".long 0xb2fa0040", 49)	/* NIAI 4 */
 		"	l	%0,%1\n"
 		: "=d" (owner) : "Q" (*lock) : "memory");
···
 {
 	int expected = old;
 
-	asm volatile(
+	asm_inline volatile(
 		ALTERNATIVE("", ".long 0xb2fa0080", 49)	/* NIAI 8 */
 		"	cs	%0,%3,%1\n"
 		: "=d" (old), "=Q" (*lock)