Merge tag 'kbuild-v6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Implement the binary search in modpost for faster symbol lookup

 - Respect HOSTCC when linking host programs written in Rust

 - Change the binrpm-pkg target to generate kernel-devel RPM package

 - Fix endianness issues for tee and ishtp MODULE_DEVICE_TABLE

 - Unify vdso_install rules

 - Remove unused __memexit* annotations

 - Eliminate stale whitelisting for __devinit/__devexit from modpost

 - Enable dummy-tools to handle the -fpatchable-function-entry flag

 - Add 'userldlibs' syntax

* tag 'kbuild-v6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (30 commits)
  kbuild: support 'userldlibs' syntax
  kbuild: dummy-tools: pretend we understand -fpatchable-function-entry
  kbuild: Correct missing architecture-specific hyphens
  modpost: squash ALL_{INIT,EXIT}_TEXT_SECTIONS to ALL_TEXT_SECTIONS
  modpost: merge sectioncheck table entries regarding init/exit sections
  modpost: use ALL_INIT_SECTIONS for the section check from DATA_SECTIONS
  modpost: disallow the combination of EXPORT_SYMBOL and __meminit*
  modpost: remove EXIT_SECTIONS macro
  modpost: remove MEM_INIT_SECTIONS macro
  modpost: remove more symbol patterns from the section check whitelist
  modpost: disallow *driver to reference .meminit* sections
  linux/init: remove __memexit* annotations
  modpost: remove ALL_EXIT_DATA_SECTIONS macro
  kbuild: simplify cmd_ld_multi_m
  kbuild: avoid too many execution of scripts/pahole-flags.sh
  kbuild: remove ARCH_POSTLINK from module builds
  kbuild: unify no-compiler-targets and no-sync-config-targets
  kbuild: unify vdso_install rules
  docs: kbuild: add INSTALL_DTBS_PATH
  UML: remove unused cmd_vdso_install
  ...

Author: torvalds

.gitignore

@@ -74,7 +74,6 @@ modules.order
 #
 # RPM spec file (make rpm-pkg)
 #
-/kernel.spec
 /rpmbuild/
 
 #

Documentation/kbuild/kbuild.rst

@@ -243,6 +243,12 @@ The output directory is often set using "O=..." on the commandline.
 
 The value can be overridden in which case the default value is ignored.
 
+INSTALL_DTBS_PATH
+-----------------
+INSTALL_DTBS_PATH specifies where to install device tree blobs for
+relocations required by build roots.  This is not defined in the
+makefile but the argument can be passed to make if needed.
+
 KBUILD_ABS_SRCTREE
 --------------------------------------------------
 Kbuild uses a relative path to point to the tree when possible. For instance,

Documentation/kbuild/makefiles.rst

@@ -937,6 +937,10 @@ Example::
   # net/bpfilter/Makefile
   bpfilter_umh-userldflags += -static
 
+To specify libraries linked to a userspace program, you can use
+``<executable>-userldlibs``. The ``userldlibs`` syntax specifies libraries
+linked to all userspace programs created in the current Makefile.
+
 When linking bpfilter_umh, it will be passed the extra option -static.
 
 From command line, :ref:`USERCFLAGS and USERLDFLAGS <userkbuildflags>` will also be used.
@@ -1623,6 +1627,13 @@ INSTALL_MOD_STRIP
   INSTALL_MOD_STRIP value will be used as the option(s) to the strip
   command.
 
+INSTALL_DTBS_PATH
+  This variable specifies a prefix for relocations required by build
+  roots. It defines a place for installing the device tree blobs. Like
+  INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed
+  by the user if desired. Otherwise it defaults to the kernel install
+  path.
+
 Makefile language
 =================
 

MAINTAINERS

@@ -3781,7 +3781,7 @@ F:	net/sched/act_bpf.c
 F:	net/sched/cls_bpf.c
 F:	samples/bpf/
 F:	scripts/bpf_doc.py
-F:	scripts/pahole-flags.sh
+F:	scripts/Makefile.btf
 F:	scripts/pahole-version.sh
 F:	tools/bpf/
 F:	tools/lib/bpf/

Makefile

@@ -277,18 +277,13 @@ no-dot-config-targets := $(clean-targets) \
 			 $(version_h) headers headers_% archheaders archscripts \
 			 %asm-generic kernelversion %src-pkg dt_binding_check \
 			 outputmakefile rustavailable rustfmt rustfmtcheck
-# 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 modules_sign kernelrelease image_name
 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 			  image_name
 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
 
 config-build	:=
 mixed-build	:=
 need-config	:= 1
-need-compiler	:= 1
 may-sync-config	:= 1
 single-build	:=
 
@@ -298,18 +293,14 @@ 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 :=
 	endif
 endif
 
+need-compiler := $(may-sync-config)
+
 ifneq ($(KBUILD_EXTMOD),)
 	may-sync-config :=
 endif
@@ -522,8 +513,6 @@ LZ4		= lz4c
 XZ		= xz
 ZSTD		= zstd
 
-PAHOLE_FLAGS	= $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
-
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 NOSTDINC_FLAGS :=
@@ -614,7 +603,6 @@ export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
-export PAHOLE_FLAGS
 
 # Files to ignore in find ... statements
 
@@ -684,7 +672,7 @@ ifdef config-build
 # *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.
+# Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
 # KBUILD_DEFCONFIG may point out an alternative default configuration
 # used for 'make defconfig'
 include $(srctree)/arch/$(SRCARCH)/Makefile
@@ -698,7 +686,7 @@ config: outputmakefile scripts_basic FORCE
 
 else #!config-build
 # ===========================================================================
-# Build targets only - this includes vmlinux, arch specific targets, clean
+# Build targets only - this includes vmlinux, arch-specific targets, clean
 # targets and others. In general all targets except *config targets.
 
 # If building an external module we do not care about the all: rule
@@ -1011,6 +999,7 @@ KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 # include additional Makefiles when needed
 include-y			:= scripts/Makefile.extrawarn
 include-$(CONFIG_DEBUG_INFO)	+= scripts/Makefile.debug
+include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
 include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
 include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
 include-$(CONFIG_KMSAN)		+= scripts/Makefile.kmsan
@@ -1317,6 +1306,14 @@ scripts_unifdef: scripts_basic
 quiet_cmd_install = INSTALL $(INSTALL_PATH)
       cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
 
+# ---------------------------------------------------------------------------
+# vDSO install
+
+PHONY += vdso_install
+vdso_install: export INSTALL_FILES = $(vdso-install-y)
+vdso_install:
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
+
 # ---------------------------------------------------------------------------
 # Tools
 
@@ -1486,7 +1483,7 @@ MRPROPER_FILES += include/config include/generated          \
 		  certs/signing_key.pem \
 		  certs/x509.genkey \
 		  vmlinux-gdb.py \
-		  kernel.spec rpmbuild \
+		  rpmbuild \
 		  rust/libmacros.so
 
 # clean - Delete most, but leave enough to build external modules
@@ -1560,6 +1557,7 @@ help:
 	@echo  '* vmlinux	  - Build the bare kernel'
 	@echo  '* modules	  - Build all modules'
 	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
+	@echo  '  vdso_install    - Install unstripped vdso 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'
@@ -1637,9 +1635,9 @@ help:
 	@echo  'Documentation targets:'
 	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
 	@echo  ''
-	@echo  'Architecture specific targets ($(SRCARCH)):'
+	@echo  'Architecture-specific targets ($(SRCARCH)):'
 	@$(or $(archhelp),\
-		echo '  No architecture specific help defined for $(SRCARCH)')
+		echo '  No architecture-specific help defined for $(SRCARCH)')
 	@echo  ''
 	@$(if $(boards), \
 		$(foreach b, $(boards), \
@@ -1681,7 +1679,7 @@ 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) $*):'
+	@echo  'Architecture-specific targets ($(SRCARCH) $*):'
 	@$(if $(boards-per-dir), \
 		$(foreach b, $(boards-per-dir), \
 		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \

arch/arm/Makefile

@@ -304,11 +304,7 @@ $(INSTALL_TARGETS): KBUILD_IMAGE = $(boot)/$(patsubst %install,%Image,$@)
 $(INSTALL_TARGETS):
 	$(call cmd,install)
 
-PHONY += vdso_install
-vdso_install:
-ifeq ($(CONFIG_VDSO),y)
-	$(Q)$(MAKE) $(build)=arch/arm/vdso $@
-endif
+vdso-install-$(CONFIG_VDSO) += arch/arm/vdso/vdso.so.dbg
 
 # My testing targets (bypasses dependencies)
 bp:;	$(Q)$(MAKE) $(build)=$(boot) $(boot)/bootpImage
@@ -331,7 +327,6 @@ define archhelp
   echo  '                  Install using (your) ~/bin/$(INSTALLKERNEL) or'
   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
   echo  '                  install to $$(INSTALL_PATH) and run lilo'
-  echo  '  vdso_install  - Install unstripped vdso.so to $$(INSTALL_MOD_PATH)/vdso'
   echo
   echo  '  multi_v7_lpae_defconfig     - multi_v7_defconfig with CONFIG_ARM_LPAE enabled'
 endef

arch/arm/vdso/Makefile

@@ -63,28 +63,3 @@ quiet_cmd_vdsold_and_vdso_check = LD      $@
 
 quiet_cmd_vdsomunge = MUNGE   $@
       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
-
-#
-# Install the unstripped copy of vdso.so.dbg.  If our toolchain
-# supports build-id, install .build-id links as well.
-#
-# Cribbed from arch/x86/vdso/Makefile.
-#
-quiet_cmd_vdso_install = INSTALL $<
-define cmd_vdso_install
-	cp $< "$(MODLIB)/vdso/vdso.so"; \
-	if readelf -n $< | grep -q 'Build ID'; then \
-	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
-	  first=`echo $$buildid | cut -b-2`; \
-	  last=`echo $$buildid | cut -b3-`; \
-	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
-	  ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
-	fi
-endef
-
-$(MODLIB)/vdso: FORCE
-	@mkdir -p $(MODLIB)/vdso
-
-PHONY += vdso_install
-vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
-	$(call cmd,vdso_install)

arch/arm64/Makefile

@@ -169,12 +169,6 @@ install: KBUILD_IMAGE := $(boot)/Image
 install zinstall:
 	$(call cmd,install)
 
-PHONY += vdso_install
-vdso_install:
-	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
-	$(if $(CONFIG_COMPAT_VDSO), \
-		$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
-
 archprepare:
 	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi
 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
@@ -205,6 +199,9 @@ ifdef CONFIG_COMPAT_VDSO
 endif
 endif
 
+vdso-install-y				+= arch/arm64/kernel/vdso/vdso.so.dbg
+vdso-install-$(CONFIG_COMPAT_VDSO)	+= arch/arm64/kernel/vdso32/vdso.so.dbg:vdso32.so
+
 include $(srctree)/scripts/Makefile.defconf
 
 PHONY += virtconfig

arch/arm64/kernel/vdso/Makefile

@@ -78,13 +78,3 @@ include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
 # Actual build commands
 quiet_cmd_vdsold_and_vdso_check = LD      $@
       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
-
-# Install commands for the unstripped file
-quiet_cmd_vdso_install = INSTALL $@
-      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
-
-vdso.so: $(obj)/vdso.so.dbg
-	@mkdir -p $(MODLIB)/vdso
-	$(call cmd,vdso_install)
-
-vdso_install: vdso.so

arch/arm64/kernel/vdso32/Makefile

@@ -172,13 +172,3 @@ gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh
 quiet_cmd_vdsosym = VDSOSYM $@
 # The AArch64 nm should be able to read an AArch32 binary
       cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
-
-# Install commands for the unstripped file
-quiet_cmd_vdso_install = INSTALL32 $@
-      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/vdso32.so
-
-vdso.so: $(obj)/vdso.so.dbg
-	@mkdir -p $(MODLIB)/vdso
-	$(call cmd,vdso_install)
-
-vdso_install: vdso.so