x86/setup: Clean up the header portion of setup.c

In 20 years we accumulated 89 #include lines in setup.c,
but we only need 30 of them (!) ...

Get rid of the excessive ones, and while at it, sort the
remaining ones alphabetically.

Also get rid of the incomplete changelogs at the header of the file,
and explain better what this file does.

Cc: linux-kernel@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/setup.c

@@ -2,123 +2,45 @@
 /*
  *  Copyright (C) 1995  Linus Torvalds
  *
- *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
- *
- *  Memory region support
- *	David Parsons <orc@pell.chi.il.us>, July-August 1999
- *
- *  Added E820 sanitization routine (removes overlapping memory regions);
- *  Brian Moyle <bmoyle@mvista.com>, February 2001
- *
- * Moved CPU detection code to cpu/${cpu}.c
- *    Patrick Mochel <mochel@osdl.org>, March 2002
- *
- *  Provisions for empty E820 memory regions (reported by certain BIOSes).
- *  Alex Achenbach <xela@slit.de>, December 2002.
- *
+ * This file contains the setup_arch() code, which handles the architecture-dependent
+ * parts of early kernel initialization.
  */
-
-/*
- * This file handles the architecture-dependent parts of initialization
- */
-
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/mmzone.h>
-#include <linux/screen_info.h>
-#include <linux/ioport.h>
-#include <linux/acpi.h>
-#include <linux/sfi.h>
-#include <linux/apm_bios.h>
-#include <linux/initrd.h>
-#include <linux/memblock.h>
-#include <linux/seq_file.h>
 #include <linux/console.h>
-#include <linux/root_dev.h>
-#include <linux/highmem.h>
-#include <linux/export.h>
+#include <linux/crash_dump.h>
+#include <linux/dmi.h>
 #include <linux/efi.h>
-#include <linux/init.h>
-#include <linux/edd.h>
+#include <linux/init_ohci1394_dma.h>
+#include <linux/initrd.h>
 #include <linux/iscsi_ibft.h>
-#include <linux/nodemask.h>
-#include <linux/kexec.h>
-#include <linux/dmi.h>
-#include <linux/pfn.h>
+#include <linux/memblock.h>
 #include <linux/pci.h>
-#include <asm/pci-direct.h>
-#include <linux/init_ohci1394_dma.h>
-#include <linux/kvm_para.h>
-#include <linux/dma-contiguous.h>
-#include <xen/xen.h>
-#include <uapi/linux/mount.h>
-
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/delay.h>
-
-#include <linux/kallsyms.h>
-#include <linux/cpufreq.h>
-#include <linux/dma-mapping.h>
-#include <linux/ctype.h>
-#include <linux/uaccess.h>
-
-#include <linux/percpu.h>
-#include <linux/crash_dump.h>
+#include <linux/root_dev.h>
+#include <linux/sfi.h>
 #include <linux/tboot.h>
-#include <linux/jiffies.h>
-#include <linux/mem_encrypt.h>
-#include <linux/sizes.h>
-
 #include <linux/usb/xhci-dbgp.h>
-#include <video/edid.h>
 
-#include <asm/mtrr.h>
+#include <uapi/linux/mount.h>
+
+#include <xen/xen.h>
+
 #include <asm/apic.h>
-#include <asm/realmode.h>
-#include <asm/e820/api.h>
-#include <asm/mpspec.h>
-#include <asm/setup.h>
-#include <asm/efi.h>
-#include <asm/timer.h>
-#include <asm/i8259.h>
-#include <asm/sections.h>
-#include <asm/io_apic.h>
-#include <asm/ist.h>
-#include <asm/setup_arch.h>
 #include <asm/bios_ebda.h>
-#include <asm/cacheflush.h>
-#include <asm/processor.h>
 #include <asm/bugs.h>
-#include <asm/kasan.h>
-
-#include <asm/vsyscall.h>
 #include <asm/cpu.h>
-#include <asm/desc.h>
-#include <asm/dma.h>
-#include <asm/iommu.h>
+#include <asm/efi.h>
 #include <asm/gart.h>
-#include <asm/mmu_context.h>
-#include <asm/proto.h>
-
-#include <asm/paravirt.h>
 #include <asm/hypervisor.h>
-#include <asm/olpc_ofw.h>
-
-#include <asm/percpu.h>
-#include <asm/topology.h>
-#include <asm/apicdef.h>
-#include <asm/amd_nb.h>
+#include <asm/io_apic.h>
+#include <asm/kasan.h>
+#include <asm/kaslr.h>
 #include <asm/mce.h>
-#include <asm/alternative.h>
+#include <asm/mtrr.h>
+#include <asm/olpc_ofw.h>
+#include <asm/pci-direct.h>
 #include <asm/prom.h>
-#include <asm/microcode.h>
-#include <asm/kaslr.h>
+#include <asm/proto.h>
 #include <asm/unwind.h>
+#include <asm/vsyscall.h>
 
 /*
  * max_low_pfn_mapped: highest direct mapped pfn under 4GB