diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 46aa2c9..6c80f69 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -46,20 +46,7 @@ static __always_inline void native_write_cr3(unsigned long val)
 static inline unsigned long native_read_cr4(void)
 {
 	unsigned long val;
-#ifdef CONFIG_X86_32
-	/*
-	 * This could fault if CR4 does not exist.  Non-existent CR4
-	 * is functionally equivalent to CR4 == 0.  Keep it simple and pretend
-	 * that CR4 == 0 on CPUs that don't have CR4.
-	 */
-	asm volatile("1: mov %%cr4, %0\n"
-		     "2:\n"
-		     _ASM_EXTABLE(1b, 2b)
-		     : "=r" (val) : "0" (0));
-#else
-	/* CR4 always exists on x86_64. */
 	asm volatile("mov %%cr4,%0" : "=r" (val));
-#endif
 	return val;
 }
 
diff --git a/arch/x86/include/asm/string_64.h b/arch/x86/include/asm/string_64.h
index 4635616..0ea680b 100644
--- a/arch/x86/include/asm/string_64.h
+++ b/arch/x86/include/asm/string_64.h
@@ -3,7 +3,6 @@
 #define _ASM_X86_STRING_64_H
 
 #ifdef __KERNEL__
-#include <linux/jump_label.h>
 
 /* Written 2002 by Andi Kleen */
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c735282..593ca8c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1427,7 +1427,7 @@ static bool __init vulnerable_to_its(u64 x86_arch_cap_msr)
 	return false;
 }
 
-static struct x86_cpu_id cpu_latest_microcode[] = {
+static const struct x86_cpu_id cpu_latest_microcode[] __initconst = {
 #include "microcode/intel-ucode-defs.h"
 	{}
 };
diff --git a/arch/x86/kernel/cpu/mtrr/amd.c b/arch/x86/kernel/cpu/mtrr/amd.c
index a73715d..9e440e3 100644
--- a/arch/x86/kernel/cpu/mtrr/amd.c
+++ b/arch/x86/kernel/cpu/mtrr/amd.c
@@ -51,11 +51,10 @@ amd_get_mtrr(unsigned int reg, unsigned long *base,
 
 /**
  * amd_set_mtrr - Set variable MTRR register on the local CPU.
- *
- * @reg The register to set.
- * @base The base address of the region.
- * @size The size of the region. If this is 0 the region is disabled.
- * @type The type of the region.
+ * @reg: The register to set.
+ * @base: The base address of the region.
+ * @size: The size of the region. If this is 0 the region is disabled.
+ * @type: The type of the region.
  *
  * Returns nothing.
  */
diff --git a/arch/x86/um/asm/required-features.h b/arch/x86/um/asm/required-features.h
deleted file mode 100644
index dfb967b..0000000
--- a/arch/x86/um/asm/required-features.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef __UM_REQUIRED_FEATURES_H
-#define __UM_REQUIRED_FEATURES_H
-
-/*
- * Nothing to see, just need something for the i386 and x86_64 asm
- * headers to include.
- */
-
-#endif