diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index 12ea8f8384f4..0d810fb15eac 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -65,7 +65,7 @@ clean-files += cpustr.h
 
 # ---------------------------------------------------------------------------
 
-KBUILD_CFLAGS	:= $(USERINCLUDE) $(REALMODE_CFLAGS) -D_SETUP
+KBUILD_CFLAGS	:= $(REALMODE_CFLAGS) -D_SETUP
 KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index efdfba21a5b2..4d85e600db78 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -119,8 +119,7 @@ ENTRY(startup_32)
  */
 
 	/* Load new GDT with the 64bit segments using 32bit descriptor */
-	leal	gdt(%ebp), %eax
-	movl	%eax, gdt+2(%ebp)
+	addl	%ebp, gdt+2(%ebp)
 	lgdt	gdt(%ebp)
 
 	/* Enable PAE mode */
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index a15d381e6020..90de28841242 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -142,6 +142,9 @@ startup_64:
 	decl	%ecx
 	jnz	1b
 
+	test %rbp, %rbp
+	jz .Lskip_fixup
+
 	/*
 	 * Fixup the kernel text+data virtual addresses. Note that
 	 * we might write invalid pmds, when the kernel is relocated
@@ -149,9 +152,9 @@ startup_64:
 	 * beyond _end.
 	 */
 	leaq	level2_kernel_pgt(%rip), %rdi
-	leaq	4096(%rdi), %r8
+	leaq	PAGE_SIZE(%rdi), %r8
 	/* See if it is a valid page table entry */
-1:	testb	$1, 0(%rdi)
+1:	testb	$_PAGE_PRESENT, 0(%rdi)
 	jz	2f
 	addq	%rbp, 0(%rdi)
 	/* Go to the next page */
@@ -162,6 +165,7 @@ startup_64:
 	/* Fixup phys_base */
 	addq	%rbp, phys_base(%rip)
 
+.Lskip_fixup:
 	movq	$(early_level4_pgt - __START_KERNEL_map), %rax
 	jmp 1f
 ENTRY(secondary_startup_64)