2 files changed, 16 insertions, 2 deletions

diff --git a/arch/x86/include/asm/nmi.h b/arch/x86/include/asm/nmi.h
index 0e3793b821e..dc580c42851 100644
--- a/arch/x86/include/asm/nmi.h
+++ b/arch/x86/include/asm/nmi.h
@@ -54,6 +54,20 @@ struct nmiaction {
         __register_nmi_handler((t), &fn##_na);  \
 })
 
+/*
+ * For special handlers that register/unregister in the
+ * init section only.  This should be considered rare.
+ */
+#define register_nmi_handler_initonly(t, fn, fg, n)             \
+({                                                      \
+        static struct nmiaction fn##_na __initdata = {          \
+                .handler = (fn),                        \
+                .name = (n),                            \
+                .flags = (fg),                          \
+        };                                              \
+        __register_nmi_handler((t), &fn##_na);  \
+})
+
 int __register_nmi_handler(unsigned int, struct nmiaction *);
 
 void unregister_nmi_handler(unsigned int, const char *);
diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index e31bf8d5c4d..149b8d9c6ad 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -42,7 +42,7 @@ static int __init nmi_unk_cb(unsigned int val, struct pt_regs *regs)
 static void __init init_nmi_testsuite(void)
 {
         /* trap all the unknown NMIs we may generate */
-        register_nmi_handler(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk");
+        register_nmi_handler_initonly(NMI_UNKNOWN, nmi_unk_cb, 0, "nmi_selftest_unk");
 }
 
 static void __init cleanup_nmi_testsuite(void)
@@ -64,7 +64,7 @@ static void __init test_nmi_ipi(struct cpumask *mask)
 {
         unsigned long timeout;
 
-        if (register_nmi_handler(NMI_LOCAL, test_nmi_ipi_callback,
+        if (register_nmi_handler_initonly(NMI_LOCAL, test_nmi_ipi_callback,
                                  NMI_FLAG_FIRST, "nmi_selftest")) {
                 nmi_fail = FAILURE;
                 return;