s390: remove "noexec" option

Do the same like x86 with commit 76ea0025 ("x86/cpu: Remove "noexec"")
and remove the "noexec" kernel command line option.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/boot/ipl_parm.c

@@ -19,7 +19,6 @@ struct parmarea parmarea __section(".parmarea") = {
 };
 
 char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
-int __bootdata(noexec_disabled);
 
 unsigned int __bootdata_preserved(zlib_dfltcc_support) = ZLIB_DFLTCC_FULL;
 struct ipl_parameter_block __bootdata_preserved(ipl_block);
@@ -290,12 +289,6 @@ void parse_boot_command_line(void)
 				zlib_dfltcc_support = ZLIB_DFLTCC_FULL_DEBUG;
 		}
 
-		if (!strcmp(param, "noexec")) {
-			rc = kstrtobool(val, &enabled);
-			if (!rc && !enabled)
-				noexec_disabled = 1;
-		}
-
 		if (!strcmp(param, "facilities") && val)
 			modify_fac_list(val);
 

arch/s390/boot/startup.c

@@ -53,7 +53,7 @@ static void detect_facilities(void)
 	}
 	if (test_facility(78))
 		machine.has_edat2 = 1;
-	if (!noexec_disabled && test_facility(130)) {
+	if (test_facility(130)) {
 		machine.has_nx = 1;
 		__ctl_set_bit(0, 20);
 	}

arch/s390/include/asm/setup.h

@@ -72,7 +72,6 @@ extern unsigned int zlib_dfltcc_support;
 #define ZLIB_DFLTCC_INFLATE_ONLY	3
 #define ZLIB_DFLTCC_FULL_DEBUG		4
 
-extern int noexec_disabled;
 extern unsigned long ident_map_size;
 extern unsigned long max_mappable;
 

arch/s390/kernel/early.c

@@ -44,7 +44,6 @@ early_param(#param, ignore_decompressor_param_##param)
 decompressor_handled_param(mem);
 decompressor_handled_param(vmalloc);
 decompressor_handled_param(dfltcc);
-decompressor_handled_param(noexec);
 decompressor_handled_param(facilities);
 decompressor_handled_param(nokaslr);
 #if IS_ENABLED(CONFIG_KVM)
@@ -233,7 +232,7 @@ static __init void detect_machine_facilities(void)
 		S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
 		__ctl_set_bit(0, 17);
 	}
-	if (test_facility(130) && !noexec_disabled) {
+	if (test_facility(130)) {
 		S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
 		__ctl_set_bit(0, 20);
 	}

arch/s390/kernel/setup.c

@@ -145,7 +145,6 @@ static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
 static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
 static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
 
-int __bootdata(noexec_disabled);
 unsigned long __bootdata_preserved(max_mappable);
 unsigned long __bootdata(ident_map_size);
 struct physmem_info __bootdata(physmem_info);