diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index 3417110574c12212f7185213bfe566ac2b541a1e..31c379c1da41c48b7f4ee89d3c100d62895ff5b2 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _CPU_DEVICE_ID
-#define _CPU_DEVICE_ID 1
+#ifndef _ASM_X86_CPU_DEVICE_ID
+#define _ASM_X86_CPU_DEVICE_ID
 
 /*
  * Declare drivers belonging to specific x86 CPUs
@@ -9,8 +9,6 @@
 
 #include <linux/mod_devicetable.h>
 
-extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
-
 /*
  * Match specific microcode revisions.
  *
@@ -22,21 +20,22 @@ extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
  */
 
 struct x86_cpu_desc {
-	__u8	x86_family;
-	__u8	x86_vendor;
-	__u8	x86_model;
-	__u8	x86_stepping;
-	__u32	x86_microcode_rev;
+	u8	x86_family;
+	u8	x86_vendor;
+	u8	x86_model;
+	u8	x86_stepping;
+	u32	x86_microcode_rev;
 };
 
-#define INTEL_CPU_DESC(mod, step, rev) {			\
-	.x86_family = 6,					\
-	.x86_vendor = X86_VENDOR_INTEL,				\
-	.x86_model = mod,					\
-	.x86_stepping = step,					\
-	.x86_microcode_rev = rev,				\
+#define INTEL_CPU_DESC(model, stepping, revision) {		\
+	.x86_family		= 6,				\
+	.x86_vendor		= X86_VENDOR_INTEL,		\
+	.x86_model		= (model),			\
+	.x86_stepping		= (stepping),			\
+	.x86_microcode_rev	= (revision),			\
 }
 
+extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
 extern bool x86_cpu_has_min_microcode_rev(const struct x86_cpu_desc *table);
 
-#endif
+#endif /* _ASM_X86_CPU_DEVICE_ID */