Merge tag 'kbuild-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Evaluate $(call cc-option,...) etc. only for build targets

 - Add CONFIG_VMLINUX_MAP to generate .map file when linking vmlinux

 - Remove unnecessary --gcc-toolchains Clang flag because the --prefix
   flag finds the toolchains

 - Do not pass Clang's --prefix flag when using the integrated as

 - Check the assembler version in Kconfig time

 - Add new CONFIG options, AS_VERSION, AS_IS_GNU, AS_IS_LLVM to clean up
   some dependencies in Kconfig

 - Fix invalid Module.symvers creation when building only modules
   without vmlinux

 - Fix false-positive modpost warnings when CONFIG_TRIM_UNUSED_KSYMS is
   set, but there is no module to build

 - Refactor module installation Makefile

 - Support zstd for module compression

 - Convert alpha and ia64 to use generic shell scripts to generate the
   syscall headers

 - Add a new elfnote to indicate if the kernel was built with LTO, which
   will be used by pahole

 - Flatten the directory structure under include/config/ so CONFIG
   options and filenames match

 - Change the deb source package name from linux-$(KERNELRELEASE) to
   linux-upstream

* tag 'kbuild-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (42 commits)
  kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test
  kbuild: deb-pkg: change the source package name to linux-upstream
  tools: do not include scripts/Kbuild.include
  kbuild: redo fake deps at include/config/*.h
  kbuild: remove TMPO from try-run
  MAINTAINERS: add pattern for dummy-tools
  kbuild: add an elfnote for whether vmlinux is built with lto
  ia64: syscalls: switch to generic syscallhdr.sh
  ia64: syscalls: switch to generic syscalltbl.sh
  alpha: syscalls: switch to generic syscallhdr.sh
  alpha: syscalls: switch to generic syscalltbl.sh
  sysctl: use min() helper for namecmp()
  kbuild: add support for zstd compressed modules
  kbuild: remove CONFIG_MODULE_COMPRESS
  kbuild: merge scripts/Makefile.modsign to scripts/Makefile.modinst
  kbuild: move module strip/compression code into scripts/Makefile.modinst
  kbuild: refactor scripts/Makefile.modinst
  kbuild: rename extmod-prefix to extmod_prefix
  kbuild: check module name conflict for external modules as well
  kbuild: show the target directory for depmod log
  ...

1 files changed, 103 insertions, 127 deletions

diff --git a/Makefile b/Makefile
index f03888cdba4e..9bf8df1b085b 100644
--- a/Makefile
+++ b/Makefile
@@ -264,6 +264,10 @@ no-dot-config-targets := $(clean-targets) \
 			 $(version_h) headers headers_% archheaders archscripts \
 			 %asm-generic kernelversion %src-pkg dt_binding_check \
 			 outputmakefile
+# Installation targets should not require compiler. Unfortunately, vdso_install
+# is an exception where build artifacts may be updated. This must be fixed.
+no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
+			headers_install modules_install kernelrelease image_name
 no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
 			  image_name
 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
@@ -271,6 +275,7 @@ single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
 config-build	:=
 mixed-build	:=
 need-config	:= 1
+need-compiler	:= 1
 may-sync-config	:= 1
 single-build	:=
 
@@ -280,6 +285,12 @@ ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 	endif
 endif
 
+ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
+	ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
+		need-compiler :=
+	endif
+endif
+
 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 		may-sync-config :=
@@ -339,14 +350,14 @@ __build_one_by_one:
 
 else # !mixed-build
 
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
 
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 
-include scripts/subarch.include
+include $(srctree)/scripts/subarch.include
 
 # Cross compiling and selecting different set of gcc/bin-utils
 # ---------------------------------------------------------------------------
@@ -563,20 +574,18 @@ endif
 # 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 | sed 's/\#//g')
+CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
 
 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
 ifneq ($(CROSS_COMPILE),)
 CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
-GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
-CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
-GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
-endif
-ifneq ($(GCC_TOOLCHAIN),)
-CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
-ifneq ($(LLVM_IAS),1)
+ifeq ($(LLVM_IAS),1)
+CLANG_FLAGS	+= -integrated-as
+else
 CLANG_FLAGS	+= -no-integrated-as
+GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
+CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
 endif
 CLANG_FLAGS	+= -Werror=unknown-warning-option
 KBUILD_CFLAGS	+= $(CLANG_FLAGS)
@@ -584,6 +593,12 @@ KBUILD_AFLAGS	+= $(CLANG_FLAGS)
 export CLANG_FLAGS
 endif
 
+# Include this also for config targets because some architectures need
+# cc-cross-prefix to determine CROSS_COMPILE.
+ifdef need-compiler
+include $(srctree)/scripts/Makefile.compiler
+endif
+
 ifdef config-build
 # ===========================================================================
 # *config targets only - make sure prerequisites are updated, and descend
@@ -592,7 +607,7 @@ ifdef config-build
 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 # KBUILD_DEFCONFIG may point out an alternative default configuration
 # used for 'make defconfig'
-include arch/$(SRCARCH)/Makefile
+include $(srctree)/arch/$(SRCARCH)/Makefile
 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 
 config: outputmakefile scripts_basic FORCE
@@ -679,7 +694,7 @@ RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc
 export RETPOLINE_CFLAGS
 export RETPOLINE_VDSO_CFLAGS
 
-include arch/$(SRCARCH)/Makefile
+include $(srctree)/arch/$(SRCARCH)/Makefile
 
 ifdef need-config
 ifdef may-sync-config
@@ -908,7 +923,7 @@ endif
 ifdef CONFIG_LTO_CLANG
 ifdef CONFIG_LTO_CLANG_THIN
 CC_FLAGS_LTO	:= -flto=thin -fsplit-lto-unit
-KBUILD_LDFLAGS	+= --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
+KBUILD_LDFLAGS	+= --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
 else
 CC_FLAGS_LTO	:= -flto
 endif
@@ -1069,51 +1084,10 @@ export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 export MODLIB
 
-#
-# INSTALL_MOD_STRIP, if defined, will cause modules to be
-# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
-# the default option --strip-debug will be used.  Otherwise,
-# INSTALL_MOD_STRIP value will be used as the options to the strip command.
-
-ifdef INSTALL_MOD_STRIP
-ifeq ($(INSTALL_MOD_STRIP),1)
-mod_strip_cmd = $(STRIP) --strip-debug
-else
-mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
-endif # INSTALL_MOD_STRIP=1
-else
-mod_strip_cmd = true
-endif # INSTALL_MOD_STRIP
-export mod_strip_cmd
-
-# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
-# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
-# or CONFIG_MODULE_COMPRESS_XZ.
-
-mod_compress_cmd = true
-ifdef CONFIG_MODULE_COMPRESS
-  ifdef CONFIG_MODULE_COMPRESS_GZIP
-    mod_compress_cmd = $(KGZIP) -n -f
-  endif # CONFIG_MODULE_COMPRESS_GZIP
-  ifdef CONFIG_MODULE_COMPRESS_XZ
-    mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
-  endif # CONFIG_MODULE_COMPRESS_XZ
-endif # CONFIG_MODULE_COMPRESS
-export mod_compress_cmd
-
-ifdef CONFIG_MODULE_SIG_ALL
-$(eval $(call config_filename,MODULE_SIG_KEY))
-
-mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
-else
-mod_sign_cmd = true
-endif
-export mod_sign_cmd
-
 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 
 has_libelf = $(call try-run,\
-               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
+               echo "int main() {}" | $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 
 ifdef CONFIG_STACK_VALIDATION
   ifeq ($(has_libelf),1)
@@ -1147,9 +1121,9 @@ endif # CONFIG_BPF
 
 PHONY += prepare0
 
-extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
-export MODORDER := $(extmod-prefix)modules.order
-export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
+export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
+export MODORDER := $(extmod_prefix)modules.order
+export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
 
 ifeq ($(KBUILD_EXTMOD),)
 core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
@@ -1217,7 +1191,7 @@ cmd_link-vmlinux =                                                 \
 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
-	+$(call if_changed,link-vmlinux)
+	+$(call if_changed_dep,link-vmlinux)
 
 targets := vmlinux
 
@@ -1362,7 +1336,11 @@ headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
 # Deprecated. It is no-op now.
 PHONY += headers_check
 headers_check:
-	@:
+	@echo >&2 "=================== WARNING ==================="
+	@echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
+	@echo >&2 "and will be removed after Linux 5.15 release."
+	@echo >&2 "Please remove headers_check from your scripts."
+	@echo >&2 "==============================================="
 
 ifdef CONFIG_HEADERS_INSTALL
 prepare: headers
@@ -1460,11 +1438,6 @@ endif
 
 PHONY += modules
 modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
-
-PHONY += modules_check
-modules_check: modules.order
-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
 
 cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
 
@@ -1478,12 +1451,28 @@ PHONY += modules_prepare
 modules_prepare: prepare
 	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
 
-# Target to install modules
-PHONY += modules_install
-modules_install: _modinst_ _modinst_post
+export modules_sign_only :=
+
+ifeq ($(CONFIG_MODULE_SIG),y)
+PHONY += modules_sign
+modules_sign: modules_install
+	@:
 
-PHONY += _modinst_
-_modinst_:
+# modules_sign is a subset of modules_install.
+# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
+ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
+modules_sign_only := y
+endif
+endif
+
+modinst_pre :=
+ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
+modinst_pre := __modinst_pre
+endif
+
+modules_install: $(modinst_pre)
+PHONY += __modinst_pre
+__modinst_pre:
 	@rm -rf $(MODLIB)/kernel
 	@rm -f $(MODLIB)/source
 	@mkdir -p $(MODLIB)/kernel
@@ -1495,34 +1484,6 @@ _modinst_:
 	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
 	@cp -f modules.builtin $(MODLIB)/
 	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
-
-# This depmod is only for convenience to give the initial
-# boot a modules.dep even before / is mounted read-write.  However the
-# boot script depmod is the master version.
-PHONY += _modinst_post
-_modinst_post: _modinst_
-	$(call cmd,depmod)
-
-ifeq ($(CONFIG_MODULE_SIG), y)
-PHONY += modules_sign
-modules_sign:
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
-endif
-
-else # CONFIG_MODULES
-
-# Modules not configured
-# ---------------------------------------------------------------------------
-
-PHONY += modules modules_install
-modules modules_install:
-	@echo >&2
-	@echo >&2 "The present kernel configuration has modules disabled."
-	@echo >&2 "Type 'make config' and enable loadable module support."
-	@echo >&2 "Then build a kernel with module support enabled."
-	@echo >&2
-	@exit 1
 
 endif # CONFIG_MODULES
 
@@ -1534,7 +1495,7 @@ endif # CONFIG_MODULES
 # make distclean Remove editor backup files, patch leftover files and the like
 
 # Directories & files removed with 'make clean'
-CLEAN_FILES += include/ksym vmlinux.symvers \
+CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
 	       modules.builtin modules.builtin.modinfo modules.nsdeps \
 	       compile_commands.json .thinlto-cache
 
@@ -1771,27 +1732,10 @@ KBUILD_BUILTIN :=
 KBUILD_MODULES := 1
 
 build-dirs := $(KBUILD_EXTMOD)
-PHONY += modules
-modules: $(MODORDER)
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
-
 $(MODORDER): descend
 	@:
 
-PHONY += modules_install
-modules_install: _emodinst_ _emodinst_post
-
-install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
-PHONY += _emodinst_
-_emodinst_:
-	$(Q)mkdir -p $(MODLIB)/$(install-dir)
-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
-
-PHONY += _emodinst_post
-_emodinst_post: _emodinst_
-	$(call cmd,depmod)
-
-compile_commands.json: $(extmod-prefix)compile_commands.json
+compile_commands.json: $(extmod_prefix)compile_commands.json
 PHONY += compile_commands.json
 
 clean-dirs := $(KBUILD_EXTMOD)
@@ -1813,6 +1757,43 @@ PHONY += prepare modules_prepare
 
 endif # KBUILD_EXTMOD
 
+# ---------------------------------------------------------------------------
+# Modules
+
+PHONY += modules modules_install
+
+ifdef CONFIG_MODULES
+
+modules: modules_check
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
+
+PHONY += modules_check
+modules_check: $(MODORDER)
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
+
+quiet_cmd_depmod = DEPMOD  $(MODLIB)
+      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
+                   $(KERNELRELEASE)
+
+modules_install:
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
+	$(call cmd,depmod)
+
+else # CONFIG_MODULES
+
+# Modules not configured
+# ---------------------------------------------------------------------------
+
+modules modules_install:
+	@echo >&2 '***'
+	@echo >&2 '*** The present kernel configuration has modules disabled.'
+	@echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
+	@echo >&2 '*** to enable CONFIG_MODULES.'
+	@echo >&2 '***'
+	@exit 1
+
+endif # CONFIG_MODULES
+
 # Single targets
 # ---------------------------------------------------------------------------
 # To build individual files in subdirectories, you can do like this:
@@ -1844,12 +1825,12 @@ endif
 
 PHONY += single_modpost
 single_modpost: $(single-no-ko) modules_prepare
-	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
+	$(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
 KBUILD_MODULES := 1
 
-export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
+export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
 
 # trim unrelated directories
 build-dirs := $(foreach d, $(build-dirs), \
@@ -1918,12 +1899,12 @@ nsdeps: modules
 quiet_cmd_gen_compile_commands = GEN     $@
       cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
 
-$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
+$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
 	$(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
 	$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
 	$(call if_changed,gen_compile_commands)
 
-targets += $(extmod-prefix)compile_commands.json
+targets += $(extmod_prefix)compile_commands.json
 
 PHONY += clang-tidy clang-analyzer
 
@@ -1931,7 +1912,7 @@ ifdef CONFIG_CC_IS_CLANG
 quiet_cmd_clang_tools = CHECK   $<
       cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
 
-clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
+clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
 	$(call cmd,clang_tools)
 else
 clang-tidy clang-analyzer:
@@ -2001,11 +1982,6 @@ tools/%: FORCE
 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
       cmd_rmfiles = rm -rf $(rm-files)
 
-# Run depmod only if we have System.map and depmod is executable
-quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
-      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
-                   $(KERNELRELEASE)
-
 # read saved command lines for existing targets
 existing-targets := $(wildcard $(sort $(targets)))