[Xen-devel] [RFC XEN PATCH 21/23] Import root Makefile from Linux v5.3

From: Anthony PERARD <anthony.perard@citrix.com>
To: <xen-devel@lists.xenproject.org>
Cc: Anthony PERARD <anthony.perard@citrix.com>
Subject: [Xen-devel] [RFC XEN PATCH 21/23] Import root Makefile from Linux v5.3
Date: Wed, 23 Oct 2019 17:48:35 +0100	[thread overview]
Message-ID: <20191023164837.2700240-22-anthony.perard@citrix.com> (raw)
In-Reply-To: <20191023164837.2700240-1-anthony.perard@citrix.com>

Edit a lot of it out, mostly CFLAGS, build of modules.
Edit in xenversion.
---
 xen/Makefile | 1249 ++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 1001 insertions(+), 248 deletions(-)

diff --git a/xen/Makefile b/xen/Makefile
index b1b60e679082..90645668957c 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 # This is the correct place to edit the build version.
 # All other places this is stored (eg. compile.h) should be autogenerated.
 export XEN_VERSION       = 4
@@ -11,284 +12,1036 @@ export XEN_DOMAIN	?= $(shell ([ -x /bin/dnsdomainname ] && /bin/dnsdomainname) |
 export XEN_BUILD_DATE	?= $(shell LC_ALL=C date)
 export XEN_BUILD_TIME	?= $(shell LC_ALL=C date +%T)
 export XEN_BUILD_HOST	?= $(shell hostname)
-export XEN_CONFIG_EXPERT ?= n
 
-export BASEDIR := $(CURDIR)
-export XEN_ROOT := $(BASEDIR)/..
+export XEN_ROOT := $(CURDIR)/..
+
+# *DOCUMENTATION*
+# To see a list of typical targets execute "make help"
+# More info can be located in ./README
+# Comments in this file are targeted only to the developer, do not
+# expect to learn how to build the kernel reading this file.
+
+# That's our default target when none is given on the command line
+PHONY := _all
+_all:
+
+# We are using a recursive build, so we need to do a little thinking
+# to get the ordering right.
+#
+# Most importantly: sub-Makefiles should only ever modify files in
+# their own directory. If in some directory we have a dependency on
+# a file in another dir (which doesn't happen often, but it's often
+# unavoidable when linking the built-in.a targets which finally
+# turn into xen), we will call a sub make in that other dir, and
+# after that we are sure that everything which is in that other dir
+# is now up to date.
+#
+# The only cases where we need to modify files which have global
+# effects are thus separated out and done before the recursive
+# descending is started. They are now explicitly listed as the
+# prepare rule.
+
+ifneq ($(sub_make_done),1)
 
 # Do not use make's built-in rules and variables
+# (this increases performance and avoids hard-to-debug behaviour)
 MAKEFLAGS += -rR
 
-EFI_MOUNTPOINT ?= $(BOOT_DIR)/efi
+# Avoid funny character set dependencies
+unexport LC_ALL
+LC_COLLATE=C
+LC_NUMERIC=C
+export LC_COLLATE LC_NUMERIC
 
-ARCH=$(XEN_TARGET_ARCH)
-SRCARCH=$(shell echo $(ARCH) | sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g')
+# Avoid interference with shell env settings
+unexport GREP_OPTIONS
 
-# Don't break if the build process wasn't called from the top level
-# we need XEN_TARGET_ARCH to generate the proper config
-include $(XEN_ROOT)/Config.mk
+# Beautify output
+# ---------------------------------------------------------------------------
+#
+# Normally, we echo the whole command before executing it. By making
+# that echo $($(quiet)$(cmd)), we now have the possibility to set
+# $(quiet) to choose other forms of output instead, e.g.
+#
+#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
+#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
+#
+# If $(quiet) is empty, the whole command will be printed.
+# If it is set to "quiet_", only the short version will be printed.
+# If it is set to "silent_", nothing will be printed at all, since
+# the variable $(silent_cmd_cc_o_c) doesn't exist.
+#
+# A simple variant is to prefix commands with $(Q) - that's useful
+# for commands that shall be hidden in non-verbose mode.
+#
+#	$(Q)ln $@ :<
+#
+# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
+# If KBUILD_VERBOSE equals 1 then the above command is displayed.
+#
+# To put more focus on warnings, be less verbose as default
+# Use 'make V=1' to see the full commands
 
-# Allow someone to change their config file
-export KCONFIG_CONFIG ?= .config
+ifeq ("$(origin V)", "command line")
+  KBUILD_VERBOSE = $(V)
+endif
+ifndef KBUILD_VERBOSE
+  KBUILD_VERBOSE = 0
+endif
 
-.PHONY: default
-default: build
+ifeq ($(KBUILD_VERBOSE),1)
+  quiet =
+  Q =
+else
+  quiet=quiet_
+  Q = @
+endif
+
+# If the user is running make -s (silent mode), suppress echoing of
+# commands
+
+ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
+  quiet=silent_
+endif
+
+export quiet Q KBUILD_VERBOSE
 
-.PHONY: dist
-dist: install
+# Kbuild will save output files in the current working directory.
+# This does not need to match to the root of the kernel source tree.
+#
+# For example, you can do this:
+#
+#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
+#
+# If you want to save output files in a different location, there are
+# two syntaxes to specify it.
+#
+# 1) O=
+# Use "make O=dir/to/store/output/files/"
+#
+# 2) Set KBUILD_OUTPUT
+# Set the environment variable KBUILD_OUTPUT to point to the output directory.
+# export KBUILD_OUTPUT=dir/to/store/output/files/; make
+#
+# The O= assignment takes precedence over the KBUILD_OUTPUT environment
+# variable.
 
-build install:: include/config/auto.conf
+# Do we want to change the working directory?
+ifeq ("$(origin O)", "command line")
+  KBUILD_OUTPUT := $(O)
+endif
 
-.PHONY: build install uninstall clean distclean cscope TAGS tags MAP gtags tests
-build install uninstall debug clean distclean cscope TAGS tags MAP gtags tests::
-ifneq ($(XEN_TARGET_ARCH),x86_32)
-	$(MAKE) -f Rules.mk _$@
+ifneq ($(KBUILD_OUTPUT),)
+# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
+# expand a shell special character '~'. We use a somewhat tedious way here.
+abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
+$(if $(abs_objtree),, \
+     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
+
+# $(realpath ...) resolves symlinks
+abs_objtree := $(realpath $(abs_objtree))
+else
+abs_objtree := $(CURDIR)
+endif # ifneq ($(KBUILD_OUTPUT),)
+
+ifeq ($(abs_objtree),$(CURDIR))
+# Suppress "Entering directory ..." unless we are changing the work directory.
+MAKEFLAGS += --no-print-directory
 else
-	echo "*** Xen x86/32 target no longer supported!"
+need-sub-make := 1
+endif
+
+abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
+
+ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
+$(error source directory cannot contain spaces or colons)
+endif
+
+ifneq ($(abs_srctree),$(abs_objtree))
+# Look for make include files relative to root of kernel src
+#
+# This does not become effective immediately because MAKEFLAGS is re-parsed
+# once after the Makefile is read. We need to invoke sub-make.
+MAKEFLAGS += --include-dir=$(abs_srctree)
+need-sub-make := 1
+endif
+
+ifneq ($(filter 3.%,$(MAKE_VERSION)),)
+# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
+# We need to invoke sub-make to avoid implicit rules in the top Makefile.
+need-sub-make := 1
+# Cancel implicit rules for this Makefile.
+$(lastword $(MAKEFILE_LIST)): ;
+endif
+
+export abs_srctree abs_objtree
+export sub_make_done := 1
+
+ifeq ($(need-sub-make),1)
+
+PHONY += $(MAKECMDGOALS) sub-make
+
+$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
+	@:
+
+# Invoke a second make in the output directory, passing relevant variables
+sub-make:
+	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
+
+endif # need-sub-make
+endif # sub_make_done
+
+# We process the rest of the Makefile if this is the final invocation of make
+ifeq ($(need-sub-make),)
+
+# Do not print "Entering directory ...",
+# but we want to display it when entering to the output directory
+# so that IDEs/editors are able to understand relative filenames.
+MAKEFLAGS += --no-print-directory
+
+# Call a source code checker (by default, "sparse") as part of the
+# C compilation.
+#
+# Use 'make C=1' to enable checking of only re-compiled files.
+# Use 'make C=2' to enable checking of *all* source files, regardless
+# of whether they are re-compiled or not.
+#
+# See the file "Documentation/dev-tools/sparse.rst" for more details,
+# including where to get the "sparse" utility.
+
+ifeq ("$(origin C)", "command line")
+  KBUILD_CHECKSRC = $(C)
+endif
+ifndef KBUILD_CHECKSRC
+  KBUILD_CHECKSRC = 0
+endif
+
+export KBUILD_CHECKSRC
+
+ifeq ($(abs_srctree),$(abs_objtree))
+        # building in the source tree
+        srctree := .
+	building_out_of_srctree :=
+else
+        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
+                # building in a subdirectory of the source tree
+                srctree := ..
+        else
+                srctree := $(abs_srctree)
+        endif
+	building_out_of_srctree := 1
+endif
+
+ifneq ($(KBUILD_ABS_SRCTREE),)
+srctree := $(abs_srctree)
+endif
+
+objtree		:= .
+VPATH		:= $(srctree)
+
+export building_out_of_srctree srctree objtree VPATH
+
+# To make sure we do not include .config for any of the *config targets
+# catch them early, and hand them over to scripts/kconfig/Makefile
+# It is allowed to specify more targets when calling make, including
+# mixing *config targets and build targets.
+# For example 'make oldconfig all'.
+# Detect when mixed targets is specified, and make a second invocation
+# of make so .config is not included in this case either (for *config).
+
+version_h := include/xen/compile.h
+
+clean-targets := %clean mrproper cleandocs
+no-dot-config-targets := $(clean-targets) \
+			 cscope gtags TAGS tags help% %docs check% \
+			 $(version_h) headers headers_% archheaders \
+			 xenversion
+no-sync-config-targets := $(no-dot-config-targets) install %install
+
+config-targets  := 0
+mixed-targets   := 0
+dot-config      := 1
+may-sync-config := 1
+
+ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
+	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
+		dot-config := 0
+	endif
 endif
 
-.PHONY: _build
-_build: $(TARGET)$(CONFIG_XEN_INSTALL_SUFFIX)
-
-.PHONY: _install
-_install: D=$(DESTDIR)
-_install: T=$(notdir $(TARGET))
-_install: Z=$(CONFIG_XEN_INSTALL_SUFFIX)
-_install: $(TARGET)$(CONFIG_XEN_INSTALL_SUFFIX)
-	[ -d $(D)$(BOOT_DIR) ] || $(INSTALL_DIR) $(D)$(BOOT_DIR)
-	$(INSTALL_DATA) $(TARGET)$(Z) $(D)$(BOOT_DIR)/$(T)-$(XEN_FULLVERSION)$(Z)
-	ln -f -s $(T)-$(XEN_FULLVERSION)$(Z) $(D)$(BOOT_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION)$(Z)
-	ln -f -s $(T)-$(XEN_FULLVERSION)$(Z) $(D)$(BOOT_DIR)/$(T)-$(XEN_VERSION)$(Z)
-	ln -f -s $(T)-$(XEN_FULLVERSION)$(Z) $(D)$(BOOT_DIR)/$(T)$(Z)
-	[ -d "$(D)$(DEBUG_DIR)" ] || $(INSTALL_DIR) $(D)$(DEBUG_DIR)
-	$(INSTALL_DATA) $(TARGET)-syms $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION)
-	$(INSTALL_DATA) $(TARGET)-syms.map $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION).map
-	$(INSTALL_DATA) $(KCONFIG_CONFIG) $(D)$(BOOT_DIR)/$(T)-$(XEN_FULLVERSION).config
-	if [ -r $(TARGET).efi -a -n '$(EFI_DIR)' ]; then \
-		[ -d $(D)$(EFI_DIR) ] || $(INSTALL_DIR) $(D)$(EFI_DIR); \
-		$(INSTALL_DATA) $(TARGET).efi $(D)$(EFI_DIR)/$(T)-$(XEN_FULLVERSION).efi; \
-		if [ -e $(TARGET).efi.map ]; then \
-			$(INSTALL_DATA) $(TARGET).efi.map $(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map; \
-		fi; \
-		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION).efi; \
-		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).efi; \
-		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T).efi; \
-		if [ -n '$(EFI_MOUNTPOINT)' -a -n '$(EFI_VENDOR)' ]; then \
-			$(INSTALL_DATA) $(TARGET).efi $(D)$(EFI_MOUNTPOINT)/efi/$(EFI_VENDOR)/$(T)-$(XEN_FULLVERSION).efi; \
-		elif [ "$(D)" = "$(patsubst $(shell cd $(XEN_ROOT) && pwd)/%,%,$(D))" ]; then \
-			echo 'EFI installation only partially done (EFI_VENDOR not set)' >&2; \
-		fi; \
-	fi
-
-.PHONY: _tests
-_tests:
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C test tests
-
-.PHONY: _uninstall
-_uninstall: D=$(DESTDIR)
-_uninstall: T=$(notdir $(TARGET))
-_uninstall: Z=$(CONFIG_XEN_INSTALL_SUFFIX)
-_uninstall:
-	rm -f $(D)$(BOOT_DIR)/$(T)-$(XEN_FULLVERSION).config
-	rm -f $(D)$(BOOT_DIR)/$(T)-$(XEN_FULLVERSION)$(Z)
-	rm -f $(D)$(BOOT_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION)$(Z)
-	rm -f $(D)$(BOOT_DIR)/$(T)-$(XEN_VERSION)$(Z)
-	rm -f $(D)$(BOOT_DIR)/$(T)$(Z)
-	rm -f $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION)
-	rm -f $(D)$(DEBUG_DIR)/$(T)-syms-$(XEN_FULLVERSION).map
-	rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_FULLVERSION).efi
-	rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION).efi
-	rm -f $(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map
-	rm -f $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).efi
-	rm -f $(D)$(EFI_DIR)/$(T).efi
-	rm -f $(D)$(EFI_MOUNTPOINT)/efi/$(EFI_VENDOR)/$(T)-$(XEN_FULLVERSION).efi
-
-.PHONY: _debug
-_debug:
-	$(OBJDUMP) -D -S $(TARGET)-syms > $(TARGET).s
-
-.PHONY: _clean
-_clean: delete-unfresh-files
-	$(MAKE) -C tools clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C include clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C common clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C drivers clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C xsm clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C crypto clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C arch/arm clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C arch/x86 clean
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C test clean
-	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) clean
-	find . \( -name "*.o" -o -name ".*.d" -o -name ".*.d2" -o -name "*.gcno" \) -exec rm -f {} \;
-	rm -f include/asm $(TARGET) $(TARGET).gz $(TARGET).efi $(TARGET).efi.map $(TARGET)-syms $(TARGET)-syms.map *~ core
-	rm -f include/asm-*/asm-offsets.h
-	rm -f .banner
-
-.PHONY: _distclean
-_distclean: clean
-	rm -f tags TAGS cscope.files cscope.in.out cscope.out cscope.po.out GTAGS GPATH GRTAGS GSYMS .config
-
-$(TARGET).gz: $(TARGET)
-	gzip -n -f -9 < $< > $@.new
-	mv $@.new $@
-
-$(TARGET): delete-unfresh-files
-	$(MAKE) -C tools
-	$(MAKE) -f $(BASEDIR)/Rules.mk include/xen/compile.h
-	[ -e include/asm ] || ln -sf asm-$(TARGET_ARCH) include/asm
-	[ -e arch/$(TARGET_ARCH)/efi ] && for f in boot.c runtime.c compat.c efi.h;\
-		do test -r arch/$(TARGET_ARCH)/efi/$$f || \
-		   ln -nsf ../../../common/efi/$$f arch/$(TARGET_ARCH)/efi/; \
-		done; \
-		true
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C include
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) asm-offsets.s
-	$(MAKE) -f $(BASEDIR)/Rules.mk include/asm-$(TARGET_ARCH)/asm-offsets.h
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) $@
-
-# drivers/char/console.o contains static banner/compile info. Blow it away.
-# Don't refresh these files during e.g., 'sudo make install'
-.PHONY: delete-unfresh-files
-delete-unfresh-files:
-	@if [ ! -r include/xen/compile.h -o -O include/xen/compile.h ]; then \
-		rm -f include/xen/compile.h; \
-	fi
-
-.banner: Makefile
-	@if which figlet >/dev/null 2>&1 ; then \
-		echo " Xen $(XEN_FULLVERSION)" | figlet -f tools/xen.flf > $@.tmp; \
-	else \
-		echo " Xen $(XEN_FULLVERSION)" > $@.tmp; \
-	fi
-	@mv -f $@.tmp $@
-
-# compile.h contains dynamic build info. Rebuilt on every 'make' invocation.
-include/xen/compile.h: include/xen/compile.h.in .banner
-	@sed -e 's/@@date@@/$(XEN_BUILD_DATE)/g' \
-	    -e 's/@@time@@/$(XEN_BUILD_TIME)/g' \
-	    -e 's/@@whoami@@/$(XEN_WHOAMI)/g' \
-	    -e 's/@@domain@@/$(XEN_DOMAIN)/g' \
-	    -e 's/@@hostname@@/$(XEN_BUILD_HOST)/g' \
-	    -e 's!@@compiler@@!$(shell $(CC) $(CFLAGS) --version 2>&1 | head -1)!g' \
-	    -e 's/@@version@@/$(XEN_VERSION)/g' \
-	    -e 's/@@subversion@@/$(XEN_SUBVERSION)/g' \
-	    -e 's/@@extraversion@@/$(XEN_EXTRAVERSION)/g' \
-	    -e 's!@@changeset@@!$(shell tools/scmversion $(XEN_ROOT) || echo "unavailable")!g' \
-	    < include/xen/compile.h.in > $@.new
-	@cat .banner
-	@$(PYTHON) tools/fig-to-oct.py < .banner >> $@.new
-	@mv -f $@.new $@
-
-include/asm-$(TARGET_ARCH)/asm-offsets.h: arch/$(TARGET_ARCH)/asm-offsets.s
-	@(set -e; \
-	  echo "/*"; \
-	  echo " * DO NOT MODIFY."; \
-	  echo " *"; \
-	  echo " * This file was auto-generated from $<"; \
-	  echo " *"; \
-	  echo " */"; \
-	  echo ""; \
-	  echo "#ifndef __ASM_OFFSETS_H__"; \
-	  echo "#define __ASM_OFFSETS_H__"; \
-	  echo ""; \
-	  sed -rne "/^[^#].*==>/{s:.*==>(.*)<==.*:\1:; s: [\$$#]: :; p;}"; \
-	  echo ""; \
-	  echo "#endif") <$< >$@
-
-SUBDIRS = xsm arch/$(TARGET_ARCH) common drivers test
-define all_sources
-    ( find include/asm-$(TARGET_ARCH) -name '*.h' -print; \
-      find include -name 'asm-*' -prune -o -name '*.h' -print; \
-      find $(SUBDIRS) -name '*.[chS]' -print )
+ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
+	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
+		may-sync-config := 0
+	endif
+endif
+
+ifneq ($(filter config %config,$(MAKECMDGOALS)),)
+	config-targets := 1
+	ifneq ($(words $(MAKECMDGOALS)),1)
+		mixed-targets := 1
+	endif
+endif
+
+# For "make -j clean all", "make -j mrproper defconfig all", etc.
+ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
+        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
+                mixed-targets := 1
+        endif
+endif
+
+# install and modules_install need also be processed one by one
+ifneq ($(filter install,$(MAKECMDGOALS)),)
+        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
+	        mixed-targets := 1
+        endif
+endif
+
+ifeq ($(mixed-targets),1)
+# ===========================================================================
+# We're called with mixed targets (*config and build targets).
+# Handle them one by one.
+
+PHONY += $(MAKECMDGOALS) __build_one_by_one
+
+$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
+	@:
+
+__build_one_by_one:
+	$(Q)set -e; \
+	for i in $(MAKECMDGOALS); do \
+		$(MAKE) -f $(srctree)/Makefile $$i; \
+	done
+
+else
+
+include scripts/Kbuild.include
+
+# Cross compiling and selecting different set of gcc/bin-utils
+# ---------------------------------------------------------------------------
+#
+# When performing cross compilation for other architectures ARCH shall be set
+# to the target architecture. (See arch/* for the possibilities).
+# ARCH can be set during invocation of make:
+# make ARCH=ia64
+# Another way is to have ARCH set in the environment.
+# The default ARCH is the host where make is executed.
+
+# CROSS_COMPILE specify the prefix used for all executables used
+# during compilation. Only gcc and related bin-utils executables
+# are prefixed with $(CROSS_COMPILE).
+# CROSS_COMPILE can be set on the command line
+# make CROSS_COMPILE=ia64-linux-
+# Alternatively CROSS_COMPILE can be set in the environment.
+# Default value for CROSS_COMPILE is not to prefix executables
+# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
+ARCH		?= $(SUBARCH)
+SRCARCH		:= $(shell echo $(XEN_TARGET_ARCH) | \
+                              sed -e 's/x86.*/x86/' -e s'/arm\(32\|64\)/arm/g')
+
+KCONFIG_CONFIG	?= .config
+export KCONFIG_CONFIG
+
+# SHELL used by kbuild
+CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
+	  else if [ -x /bin/bash ]; then echo /bin/bash; \
+	  else echo sh; fi ; fi)
+
+HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
+HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
+HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
+
+HOSTCC       = gcc
+HOSTCXX      = g++
+KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
+		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
+		$(HOSTCFLAGS)
+KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
+KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
+KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
+
+# Make variables (CC, etc...)
+AS		= $(CROSS_COMPILE)as
+LD		= $(CROSS_COMPILE)ld
+CC		= $(CROSS_COMPILE)gcc
+CPP		= $(CC) -E
+AR		= $(CROSS_COMPILE)ar
+NM		= $(CROSS_COMPILE)nm
+STRIP		= $(CROSS_COMPILE)strip
+OBJCOPY		= $(CROSS_COMPILE)objcopy
+OBJDUMP		= $(CROSS_COMPILE)objdump
+OBJSIZE		= $(CROSS_COMPILE)size
+PAHOLE		= pahole
+LEX		= flex
+YACC		= bison
+AWK		= awk
+PERL		= perl
+PYTHON		= python
+PYTHON2		= python2
+PYTHON3		= python3
+CHECK		= sparse
+
+CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
+		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
+NOSTDINC_FLAGS :=
+CFLAGS_KERNEL	=
+AFLAGS_KERNEL	=
+LDFLAGS_vmlinux =
+
+# Use LINUXINCLUDE when you must reference the include/ directory.
+# Needed to be compatible with the O= option
+LINUXINCLUDE    := \
+		$(if $(building_out_of_srctree),-I$(srctree)/include) \
+		-I$(objtree)/include
+
+KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
+KBUILD_CFLAGS   :=
+KBUILD_CPPFLAGS :=
+KBUILD_LDFLAGS :=
+GCC_PLUGINS_CFLAGS :=
+CLANG_FLAGS :=
+
+export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
+export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK
+export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE HOSTCXX
+export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
+
+export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
+export KBUILD_CFLAGS CFLAGS_KERNEL
+export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
+export KBUILD_AFLAGS AFLAGS_KERNEL
+export KBUILD_ARFLAGS
+
+# Files to ignore in find ... statements
+
+export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
+			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
+			  -prune -o
+export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
+			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
+
+# ===========================================================================
+# Rules shared between *config targets and build targets
+
+# Basic helpers built in scripts/basic/
+PHONY += scripts_basic
+scripts_basic:
+	$(Q)$(MAKE) $(build)=scripts/basic
+
+PHONY += outputmakefile
+# outputmakefile generates a Makefile in the output directory, if using a
+# separate output directory. This allows convenient use of make in the
+# output directory.
+# At the same time when output Makefile generated, generate .gitignore to
+# ignore whole output directory
+outputmakefile:
+ifdef building_out_of_srctree
+	$(Q)ln -fsn $(srctree) source
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
+	$(Q)test -e .gitignore || \
+	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
+endif
+
+ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
+ifneq ($(CROSS_COMPILE),)
+CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
+GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
+CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
+GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
+endif
+ifneq ($(GCC_TOOLCHAIN),)
+CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
+endif
+ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
+CLANG_FLAGS	+= -no-integrated-as
+endif
+CLANG_FLAGS	+= -Werror=unknown-warning-option
+KBUILD_CFLAGS	+= $(CLANG_FLAGS)
+KBUILD_AFLAGS	+= $(CLANG_FLAGS)
+export CLANG_FLAGS
+endif
+
+# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
+# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
+# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
+# and from include/config/auto.conf.cmd to detect the compiler upgrade.
+CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
+
+ifeq ($(config-targets),1)
+# ===========================================================================
+# *config targets only - make sure prerequisites are updated, and descend
+# in scripts/kconfig to make the *config target
+
+# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
+# KBUILD_DEFCONFIG may point out an alternative default configuration
+# used for 'make defconfig'
+include arch/$(SRCARCH)/Makefile
+export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
+
+config: scripts_basic outputmakefile FORCE
+	$(Q)$(MAKE) $(build)=scripts/kconfig $@
+
+%config: scripts_basic outputmakefile FORCE
+	$(Q)$(MAKE) $(build)=scripts/kconfig $@
+
+else
+# ===========================================================================
+# Build targets only - this includes vmlinux, arch specific targets, clean
+# targets and others. In general all targets except *config targets.
+
+PHONY += all
+_all: all
+
+# Just do built-in.
+
+KBUILD_BUILTIN := 1
+
+export KBUILD_BUILTIN
+
+ifeq ($(dot-config),1)
+include include/config/auto.conf
+endif
+
+ifeq ($(KBUILD_EXTMOD),)
+# Objects we will link into vmlinux / subdirs we need to visit
+init-y		:= init/
+drivers-y	:= drivers/ sound/
+drivers-$(CONFIG_SAMPLES) += samples/
+drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
+net-y		:= net/
+libs-y		:= lib/
+core-y		:= usr/
+virt-y		:= virt/
+endif # KBUILD_EXTMOD
+
+# The all: target is the default when no target is given on the
+# command line.
+# This allow a user to issue only 'make' to build a kernel including modules
+# Defaults to vmlinux, but the arch makefile usually adds further targets
+all: vmlinux
+
+CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
+	$(call cc-option,-fno-tree-loop-im) \
+	$(call cc-disable-warning,maybe-uninitialized,)
+export CFLAGS_GCOV
+
+# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
+ifdef CONFIG_FUNCTION_TRACER
+  CC_FLAGS_FTRACE := -pg
+endif
+
+RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
+RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
+RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
+RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
+RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
+RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
+export RETPOLINE_CFLAGS
+export RETPOLINE_VDSO_CFLAGS
+
+# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
+# values of the respective KBUILD_* variables
+ARCH_CPPFLAGS :=
+ARCH_AFLAGS :=
+ARCH_CFLAGS :=
+include arch/$(SRCARCH)/Makefile
+
+ifeq ($(dot-config),1)
+ifeq ($(may-sync-config),1)
+# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
+# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
+# because some architectures define CROSS_COMPILE there.
+include include/config/auto.conf.cmd
+
+$(KCONFIG_CONFIG):
+	@echo >&2 '***'
+	@echo >&2 '*** Configuration file "$@" not found!'
+	@echo >&2 '***'
+	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
+	@echo >&2 '*** "make menuconfig" or "make xconfig").'
+	@echo >&2 '***'
+	@/bin/false
+
+# The actual configuration files used during the build are stored in
+# include/generated/ and include/config/. Update them if .config is newer than
+# include/config/auto.conf (which mirrors .config).
+#
+# This exploits the 'multi-target pattern rule' trick.
+# The syncconfig should be executed only once to make all the targets.
+%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
+	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
+else
+# External modules and some install targets need include/generated/autoconf.h
+# and include/config/auto.conf but do not care if they are up-to-date.
+# Use auto.conf to trigger the test
+PHONY += include/config/auto.conf
+
+include/config/auto.conf:
+	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
+	echo >&2;							\
+	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
+	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
+	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
+	echo >&2 ;							\
+	/bin/false)
+
+endif # may-sync-config
+endif # $(dot-config)
+
+
+# arch Makefile may override CC so keep this after arch Makefile is included
+NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+
+
+
+# use the deterministic mode of AR if available
+KBUILD_ARFLAGS := $(call ar-option,D)
+
+include scripts/Makefile.kasan
+include scripts/Makefile.ubsan
+
+# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
+# last assignments
+KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
+KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
+KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
+
+# insure the checker run with the right endianness
+CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
+
+# the checker needs the correct machine size
+CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
+
+# Default kernel image to build when no specific target is given.
+# KBUILD_IMAGE may be overruled on the command line or
+# set in the environment
+# Also any assignments in arch/$(ARCH)/Makefile take precedence over
+# this default value
+export KBUILD_IMAGE ?= vmlinux
+
+#
+# INSTALL_PATH specifies where to place the updated kernel and system map
+# images. Default is /boot, but you can set it to other values
+export	INSTALL_PATH ?= /boot
+
+HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
+
+PHONY += prepare0
+
+core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
+
+vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
+		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
+		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
+
+vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
+		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
+			$(drivers-) $(net-) $(libs-) $(virt-))))
+
+init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
+core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
+drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
+net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
+libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
+libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
+virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
+
+# Externally visible symbols (used by link-vmlinux.sh)
+export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
+			      $(drivers-y) $(net-y) $(virt-y)
+export KBUILD_VMLINUX_LIBS := $(libs-y1)
+export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
+export LDFLAGS_vmlinux
+# used by scripts/package/Makefile
+export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
+
+vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
+
+ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
+
+# Final link of vmlinux with optional arch pass after final link
+cmd_link-vmlinux =                                                 \
+	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
+	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
+
+vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
+	+$(call if_changed,link-vmlinux)
+
+targets := vmlinux
+
+# The actual objects are generated when descending,
+# make sure no implicit rule kicks in
+$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
+
+# Handle descending into subdirectories listed in $(vmlinux-dirs)
+# Preset locale variables to speed up the build process. Limit locale
+# tweaks to this spot to avoid wrong language settings when running
+# make menuconfig etc.
+# Error messages still appears in the original language
+
+PHONY += $(vmlinux-dirs)
+$(vmlinux-dirs): prepare
+	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
+
+filechk_kernel.release = \
+	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
+
+# Store (new) KERNELRELEASE string in include/config/kernel.release
+include/config/kernel.release: FORCE
+	$(call filechk,kernel.release)
+
+# Additional helpers built in scripts/
+# Carefully list dependencies so we do not try to build scripts twice
+# in parallel
+PHONY += scripts
+scripts: scripts_basic scripts_dtc
+	$(Q)$(MAKE) $(build)=$(@)
+
+# Things we need to do before we recursively start building the kernel
+# or the modules are listed in "prepare".
+# A multi level approach is used. prepareN is processed before prepareN-1.
+# archprepare is used in arch Makefiles and when processed asm symlink,
+# version.h and scripts_basic is processed / created.
+
+PHONY += prepare archprepare prepare3
+
+# prepare3 is used to check if we are building in a separate output directory,
+# and if so do:
+# 1) Check that make has not been executed in the kernel src $(srctree)
+prepare3: include/config/kernel.release
+ifdef building_out_of_srctree
+	@$(kecho) '  Using $(srctree) as source for kernel'
+	$(Q)if [ -f $(srctree)/.config -o \
+		 -d $(srctree)/include/config -o \
+		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
+		echo >&2 "  $(srctree) is not clean, please run 'make ARCH=$(ARCH) mrproper'"; \
+		echo >&2 "  in the '$(srctree)' directory.";\
+		/bin/false; \
+	fi;
+endif
+
+archprepare: archheaders archscripts scripts prepare3 outputmakefile \
+	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
+
+prepare0: archprepare
+	$(Q)$(MAKE) $(build)=scripts/mod
+	$(Q)$(MAKE) $(build)=.
+
+# All the preparing..
+prepare: prepare0
+
+# Generate some files
+# ---------------------------------------------------------------------------
+
+# KERNELRELEASE can change from a few different places, meaning version.h
+# needs to be updated, so this check is forced on all builds
+
+uts_len := 64
+define filechk_utsrelease.h
+	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
+	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
+	  exit 1;                                                         \
+	fi;                                                               \
+	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
 endef
 
-define set_exuberant_flags
-    exuberant_flags=`$1 --version 2>/dev/null | (grep -iq exuberant && \
-	echo "-I __initdata,__exitdata,__acquires,__releases \
-	    -I EXPORT_SYMBOL \
-	    --extra=+f --c-kinds=+px") || true` 
+define filechk_version.h
+	echo \#define LINUX_VERSION_CODE $(shell                         \
+	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
+	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
 endef
 
-.PHONY: xenversion
+$(version_h): FORCE
+	$(call filechk,version.h)
+	$(Q)rm -f $(old_version_h)
+
+###
+# Cleaning is done on three levels.
+# make clean     Delete most generated files
+#                Leave enough to build external modules
+# make mrproper  Delete the current configuration, and all generated files
+# make distclean Remove editor backup files, patch leftover files and the like
+
+# Directories & files removed with 'make clean'
+CLEAN_DIRS  += include/ksym
+CLEAN_FILES += modules.builtin.modinfo
+
+# Directories & files removed with 'make mrproper'
+MRPROPER_DIRS  += include/config include/generated          \
+		  arch/$(SRCARCH)/include/generated .tmp_objdiff
+MRPROPER_FILES += .config .config.old .version \
+		  Module.symvers \
+		  signing_key.pem signing_key.priv signing_key.x509	\
+		  x509.genkey extra_certificates signing_key.x509.keyid	\
+		  signing_key.x509.signer vmlinux-gdb.py
+
+# Directories & files removed with 'make distclean'
+DISTCLEAN_DIRS  +=
+DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
+
+# clean - Delete most, but leave enough to build external modules
+#
+clean: rm-dirs  := $(CLEAN_DIRS)
+clean: rm-files := $(CLEAN_FILES)
+clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
+
+PHONY += $(clean-dirs) clean archclean vmlinuxclean
+$(clean-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
+
+vmlinuxclean:
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
+	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
+
+clean: archclean vmlinuxclean
+
+# mrproper - Delete all generated files, including .config
+#
+mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
+mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
+mrproper-dirs      := $(addprefix _mrproper_,scripts)
+
+PHONY += $(mrproper-dirs) mrproper
+$(mrproper-dirs):
+	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
+
+mrproper: clean $(mrproper-dirs)
+	$(call cmd,rmdirs)
+	$(call cmd,rmfiles)
+
+# distclean
+#
+distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
+distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
+
+PHONY += distclean
+
+distclean: mrproper
+	$(call cmd,rmdirs)
+	$(call cmd,rmfiles)
+	@find $(srctree) $(RCS_FIND_IGNORE) \
+		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
+		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
+		-o -name 'core' \) \
+		-type f -print | xargs rm -f
+
+
+# Brief documentation of the typical targets used
+# ---------------------------------------------------------------------------
+
+boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
+boards := $(sort $(notdir $(boards)))
+board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
+board-dirs := $(sort $(notdir $(board-dirs:/=)))
+
+PHONY += help
+help:
+	@echo  'Cleaning targets:'
+	@echo  '  clean		  - Remove most generated files but keep the config and'
+	@echo  '                    enough build support to build external modules'
+	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
+	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
+	@echo  ''
+	@echo  'Configuration targets:'
+	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
+	@echo  ''
+	@echo  'Other generic targets:'
+	@echo  '  all		  - Build all targets marked with [*]'
+	@echo  '* vmlinux	  - Build the bare kernel'
+	@echo  '* modules	  - Build all modules'
+	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
+	@echo  '  dir/            - Build all files in dir and below'
+	@echo  '  dir/file.[ois]  - Build specified target only'
+	@echo  '  dir/file.ll     - Build the LLVM assembly file'
+	@echo  '                    (requires compiler support for LLVM assembly generation)'
+	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
+	@echo  '                    (requires a recent binutils and recent build (System.map))'
+	@echo  '  dir/file.ko     - Build module including final link'
+	@echo  '  modules_prepare - Set up for building external modules'
+	@echo  '  tags/TAGS	  - Generate tags file for editors'
+	@echo  '  cscope	  - Generate cscope index'
+	@echo  '  gtags           - Generate GNU GLOBAL index'
+	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
+	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
+	@echo  '  image_name	  - Output the image name (use with make -s)'
+	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
+	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
+	 echo  ''
+	@echo  'Static analysers:'
+	@echo  '  checkstack      - Generate a list of stack hogs'
+	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
+	@echo  '  versioncheck    - Sanity check on version.h usage'
+	@echo  '  includecheck    - Check for duplicate included header files'
+	@echo  '  export_report   - List the usages of all exported symbols'
+	@echo  '  headers_check   - Sanity check on exported headers'
+	@echo  '  headerdep       - Detect inclusion cycles in headers'
+	@echo  '  coccicheck      - Check with Coccinelle'
+	@echo  ''
+	@echo  'Kernel selftest:'
+	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
+	@echo  '                    Build, install, and boot kernel before'
+	@echo  '                    running kselftest on it'
+	@echo  '  kselftest-clean - Remove all generated kselftest files'
+	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
+	@echo  '                    .config.'
+	@echo  ''
+	@$(if $(dtstree), \
+		echo 'Devicetree:'; \
+		echo '* dtbs            - Build device tree blobs for enabled boards'; \
+		echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
+		echo '')
+
+	@echo 'Userspace tools targets:'
+	@echo '  use "make tools/help"'
+	@echo '  or  "cd tools; make help"'
+	@echo  ''
+	@echo  'Kernel packaging:'
+	@$(MAKE) $(build)=$(package-dir) help
+	@echo  ''
+	@echo  'Documentation targets:'
+	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
+	@echo  ''
+	@echo  'Architecture specific targets ($(SRCARCH)):'
+	@$(if $(archhelp),$(archhelp),\
+		echo '  No architecture specific help defined for $(SRCARCH)')
+	@echo  ''
+	@$(if $(boards), \
+		$(foreach b, $(boards), \
+		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
+		echo '')
+	@$(if $(board-dirs), \
+		$(foreach b, $(board-dirs), \
+		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
+		printf "  %-16s - Show all of the above\\n" help-boards; \
+		echo '')
+
+	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
+	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
+	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
+	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
+	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
+	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
+	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
+	@echo  '		1: warnings which may be relevant and do not occur too often'
+	@echo  '		2: warnings which occur quite often but may still be relevant'
+	@echo  '		3: more obscure warnings, can most likely be ignored'
+	@echo  '		Multiple levels can be combined with W=12 or W=123'
+	@echo  ''
+	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
+	@echo  'For further info see the ./README file'
+
+
+help-board-dirs := $(addprefix help-,$(board-dirs))
+
+help-boards: $(help-board-dirs)
+
+boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
+
+$(help-board-dirs): help-%:
+	@echo  'Architecture specific targets ($(SRCARCH) $*):'
+	@$(if $(boards-per-dir), \
+		$(foreach b, $(boards-per-dir), \
+		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
+		echo '')
+
+
+# Misc
+# ---------------------------------------------------------------------------
+
+clean: $(clean-dirs)
+	$(call cmd,rmdirs)
+	$(call cmd,rmfiles)
+	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
+		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
+		-o -name '*.ko.*' \
+		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
+		-o -name '*.dwo' -o -name '*.lst' \
+		-o -name '*.su' -o -name '*.mod' \
+		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
+		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
+		-o -name '*.asn1.[ch]' \
+		-o -name '*.symtypes' -o -name 'modules.order' \
+		-o -name modules.builtin -o -name '.tmp_*.o.*' \
+		-o -name '*.c.[012]*.*' \
+		-o -name '*.ll' \
+		-o -name '*.gcno' \) -type f -print | xargs rm -f
+
+# Generate tags for editors
+# ---------------------------------------------------------------------------
+quiet_cmd_tags = GEN     $@
+      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
+
+tags TAGS cscope gtags: FORCE
+	$(call cmd,tags)
+
+# Scripts to check various things for consistency
+# ---------------------------------------------------------------------------
+
+PHONY += includecheck versioncheck
+
+includecheck:
+	find $(srctree)/* $(RCS_FIND_IGNORE) \
+		-name '*.[hcS]' -type f -print | sort \
+		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
+
+versioncheck:
+	find $(srctree)/* $(RCS_FIND_IGNORE) \
+		-name '*.[hcS]' -type f -print | sort \
+		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
+
+PHONY += xenversion image_name
+
 xenversion:
 	@echo $(XEN_FULLVERSION)
 
-.PHONY: _TAGS
-_TAGS: 
-	set -e; rm -f TAGS; \
-	$(call set_exuberant_flags,etags); \
-	$(all_sources) | xargs etags $$exuberant_flags -a
-
-.PHONY: _tags
-_tags: 
-	set -e; rm -f tags; \
-	$(call set_exuberant_flags,ctags); \
-	$(all_sources) | xargs ctags $$exuberant_flags -a
-
-.PHONY: _gtags
-_gtags:
-	set -e; rm -f GTAGS GSYMS GPATH GRTAGS
-	$(all_sources) | gtags -f -
-
-.PHONY: _cscope
-_cscope:
-	$(all_sources) > cscope.files
-	cscope -k -b -q
-
-.PHONY: _MAP
-_MAP:
-	$(NM) -n $(TARGET)-syms | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' > System.map
-
-.PHONY: FORCE
-FORCE:
-
-%.o %.i %.s: %.c FORCE
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C $(*D) $(@F)
+image_name:
+	@echo $(KBUILD_IMAGE)
 
-%.o %.s: %.S FORCE
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C $(*D) $(@F)
+# Single targets
+# ---------------------------------------------------------------------------
+# Single targets are compatible with:
+# - build with mixed source and output
+# - build with separate output dir 'make O=...'
+#
+#  target-dir => where to store outputfile
+#  build-dir  => directory in kernel source tree to use
 
-%/: FORCE
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C $* built_in.o built_in_bin.o
+build-target = $@
+build-dir = $(patsubst %/,%,$(dir $(build-target)))
 
-build-intermediate = $(eval $(call build-intermediate-closure,$(1)))
-define build-intermediate-closure
-$(1): FORCE
-	$(MAKE) -f $(BASEDIR)/Rules.mk -C $$(@D) $$(@F)
-endef
+%.i: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
+%.ll: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
+%.lst: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
+%.o: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
+%.s: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
+%.symtypes: prepare FORCE
+	$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
 
-$(foreach base,arch/x86/mm/guest_walk_% \
-               arch/x86/mm/hap/guest_walk_%level \
-               arch/x86/mm/shadow/guest_%, \
-    $(foreach ext,o i s,$(call build-intermediate,$(base).$(ext))))
+# FIXME Should go into a make.lib or something
+# ===========================================================================
 
-kconfig := oldconfig config menuconfig defconfig \
-	nconfig xconfig gconfig savedefconfig listnewconfig olddefconfig \
-	randconfig $(notdir $(wildcard arch/$(SRCARCH)/configs/*_defconfig))
-.PHONY: $(kconfig)
-$(kconfig):
-	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" $@
+quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
+      cmd_rmdirs = rm -rf $(rm-dirs)
 
-include/config/%.conf: include/config/auto.conf.cmd $(KCONFIG_CONFIG)
-	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" syncconfig
+quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
+      cmd_rmfiles = rm -f $(rm-files)
 
-# Allow people to just run `make` as before and not force them to configure
-$(KCONFIG_CONFIG):
-	$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) SRCARCH=$(SRCARCH) HOSTCC="$(HOSTCC)" HOSTCXX="$(HOSTCXX)" defconfig
+# read saved command lines for existing targets
+existing-targets := $(wildcard $(sort $(targets)))
 
-# Break the dependency chain for the first run
-include/config/auto.conf.cmd: ;
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 
--include $(BASEDIR)/include/config/auto.conf.cmd
+endif   # ifeq ($(config-targets),1)
+endif   # ifeq ($(mixed-targets),1)
+endif   # need-sub-make
 
-.PHONY: cloc
-cloc:
-	$(eval tmpfile := $(shell mktemp))
-	$(foreach f, $(shell find $(BASEDIR) -name *.o.d), \
-		$(eval path := $(dir $(f))) \
-		$(eval names := $(shell grep -o "[a-zA-Z0-9_/-]*\.[cS]" $(f))) \
-		$(foreach sf, $(names), \
-			$(shell if test -f $(path)/$(sf) ; then echo $(path)/$(sf) >> $(tmpfile); fi;)))
-	cloc --list-file=$(tmpfile)
-	rm $(tmpfile)
+PHONY += FORCE
+FORCE:
 
+# Declare the contents of the PHONY variable as phony.  We keep that
+# information in a variable so we can use it in if_changed and friends.
+.PHONY: $(PHONY)
-- 
Anthony PERARD

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