diff --git a/arch/s390/include/asm/nospec-branch.h b/arch/s390/include/asm/nospec-branch.h
index 35bf28fe4c64..b4bd8c41e9d3 100644
--- a/arch/s390/include/asm/nospec-branch.h
+++ b/arch/s390/include/asm/nospec-branch.h
@@ -9,6 +9,7 @@
 extern int nospec_disable;
 
 void nospec_init_branches(void);
+void nospec_auto_detect(void);
 void nospec_revert(s32 *start, s32 *end);
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/s390/kernel/nospec-branch.c b/arch/s390/kernel/nospec-branch.c
index 14867ec5f726..f236ce8757e8 100644
--- a/arch/s390/kernel/nospec-branch.c
+++ b/arch/s390/kernel/nospec-branch.c
@@ -72,7 +72,7 @@ static int __init nospectre_v2_setup_early(char *str)
 }
 early_param("nospectre_v2", nospectre_v2_setup_early);
 
-static int __init spectre_v2_auto_early(void)
+void __init nospec_auto_detect(void)
 {
 	if (IS_ENABLED(CC_USING_EXPOLINE)) {
 		/*
@@ -87,11 +87,7 @@ static int __init spectre_v2_auto_early(void)
 	 * nobp setting decides what is done, this depends on the
 	 * CONFIG_KERNEL_NP option and the nobp/nospec parameters.
 	 */
-	return 0;
 }
-#ifdef CONFIG_EXPOLINE_AUTO
-early_initcall(spectre_v2_auto_early);
-#endif
 
 static int __init spectre_v2_setup_early(char *str)
 {
@@ -102,7 +98,7 @@ static int __init spectre_v2_setup_early(char *str)
 	if (str && !strncmp(str, "off", 3))
 		nospec_disable = 1;
 	if (str && !strncmp(str, "auto", 4))
-		spectre_v2_auto_early();
+		nospec_auto_detect();
 	return 0;
 }
 early_param("spectre_v2", spectre_v2_setup_early);
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 7b58a712f818..fc3b4aa185cc 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -894,6 +894,9 @@ void __init setup_arch(char **cmdline_p)
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = (unsigned long) _end;
 
+	if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
+		nospec_auto_detect();
+
 	parse_early_param();
 #ifdef CONFIG_CRASH_DUMP
 	/* Deactivate elfcorehdr= kernel parameter */