Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 boot updates from Ingo Molnar:
 "Misc cleanups/simplifications by Borislav Petkov, Paul Bolle and Wei
  Yang"

* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot/64: Optimize fixmap page fixup
  x86/boot: Simplify the GDTR calculation assembly code a bit
  x86/boot/build: Remove always empty $(USERINCLUDE)

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

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 */

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)