s390/alternatives: Remove noaltinstr option

The current Kernel doesn't boot without alternative patching on
z16 machines. To avoid such bugs in the future, remove the option
disable alternative patching.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
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>

Documentation/admin-guide/kernel-parameters.txt

@@ -3830,9 +3830,6 @@
 
 	noalign		[KNL,ARM]
 
-	noaltinstr	[S390,EARLY] Disables alternative instructions
-			patching (CPU alternatives feature).
-
 	noapic		[SMP,APIC,EARLY] Tells the kernel to not make use of any
 			IOAPICs that may be present in the system.
 

arch/s390/kernel/alternative.c

@@ -7,18 +7,8 @@
 #include <asm/facility.h>
 #include <asm/nospec-branch.h>
 
-static int __initdata_or_module alt_instr_disabled;
-
-static int __init disable_alternative_instructions(char *str)
-{
-	alt_instr_disabled = 1;
-	return 0;
-}
-
-early_param("noaltinstr", disable_alternative_instructions);
-
-static void __init_or_module __apply_alternatives(struct alt_instr *start,
-						  struct alt_instr *end)
+void __init_or_module apply_alternatives(struct alt_instr *start,
+					 struct alt_instr *end)
 {
 	struct alt_instr *a;
 	u8 *instr, *replacement;
@@ -37,13 +27,6 @@ static void __init_or_module __apply_alternatives(struct alt_instr *start,
 	}
 }
 
-void __init_or_module apply_alternatives(struct alt_instr *start,
-					 struct alt_instr *end)
-{
-	if (!alt_instr_disabled)
-		__apply_alternatives(start, end);
-}
-
 extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
 void __init apply_alternative_instructions(void)
 {