s390: enable CPU alternatives unconditionally

Remove the CPU_ALTERNATIVES config option and enable the code
unconditionally. The config option was only added to avoid a conflict
with the named saved segment support. Since that code is gone there is
no reason to keep the CPU_ALTERNATIVES config option.

Just enable it unconditionally to also reduce the number of config
options and make it less likely that something breaks.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

arch/s390/kernel/Makefile

@@ -59,7 +59,7 @@ obj-y	+= processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
 obj-y	+= debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
 obj-y	+= sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
 obj-y	+= runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
-obj-y	+= entry.o reipl.o relocate_kernel.o kdebugfs.o
+obj-y	+= entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
 
 extra-y				+= head.o head64.o vmlinux.lds
 
@@ -77,7 +77,6 @@ obj-$(CONFIG_KPROBES)		+= kprobes.o
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 obj-$(CONFIG_CRASH_DUMP)	+= crash_dump.o
 obj-$(CONFIG_UPROBES)		+= uprobes.o
-obj-$(CONFIG_ALTERNATIVES)	+= alternative.o
 
 obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_cpum_cf.o perf_cpum_sf.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_events.o

arch/s390/kernel/module.c

@@ -433,16 +433,13 @@ int module_finalize(const Elf_Ehdr *hdr,
 	const Elf_Shdr *s;
 	char *secstrings;
 
-	if (IS_ENABLED(CONFIG_ALTERNATIVES)) {
-		secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
-		for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
-			if (!strcmp(".altinstructions",
-				    secstrings + s->sh_name)) {
-				/* patch .altinstructions */
-				void *aseg = (void *)s->sh_addr;
+	secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
+		if (!strcmp(".altinstructions", secstrings + s->sh_name)) {
+			/* patch .altinstructions */
+			void *aseg = (void *)s->sh_addr;
 
-				apply_alternatives(aseg, aseg + s->sh_size);
-			}
+			apply_alternatives(aseg, aseg + s->sh_size);
 		}
 	}