Merge tag 'kbuild-v4.15-2' of git://git.kernel.org/pub/scm/linux/kern…

…el/git/masahiroy/linux-kbuild

Pull more Kbuild updates from Masahiro Yamada:

 - use 'pwd' instead of '/bin/pwd' for portability

 - clean up Makefiles

 - fix ld-option for clang

 - fix malloc'ed data size in Kconfig

 - fix parallel building along with coccicheck

 - fix a minor issue of package building

 - prompt to use "rpm-pkg" instead of "rpm"

 - clean up *.i and *.lst patterns by "make clean"

* tag 'kbuild-v4.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: drop $(extra-y) from real-objs-y
  kbuild: clean up *.i and *.lst patterns by make clean
  kbuild: rpm: prompt to use "rpm-pkg" if "rpm" target is used
  kbuild: pkg: use --transform option to prefix paths in tar
  coccinelle: fix parallel build with CHECK=scripts/coccicheck
  kconfig/symbol.c: use correct pointer type argument for sizeof
  kbuild: Set KBUILD_CFLAGS before incl. arch Makefile
  kbuild: remove all dummy assignments to obj-
  kbuild: create built-in.o automatically if parent directory wants it
  kbuild: /bin/pwd -> pwd

Documentation/ia64/xen.txt

@@ -41,7 +41,7 @@ Getting and Building Xen and Dom0
 
  5. make initrd for Dom0/DomU
     # make -C linux-2.6.18-xen.hg ARCH=ia64 modules_install \
-      O=$(/bin/pwd)/build-linux-2.6.18-xen_ia64
+      O=$(pwd)/build-linux-2.6.18-xen_ia64
     # mkinitrd -f /boot/efi/efi/redhat/initrd-2.6.18.8-xen.img \
       2.6.18.8-xen --builtin mptspi --builtin mptbase \
       --builtin mptscsih --builtin uhci-hcd --builtin ohci-hcd \

Makefile

@@ -132,7 +132,7 @@ ifneq ($(KBUILD_OUTPUT),)
 # check that the output directory actually exists
 saved-output := $(KBUILD_OUTPUT)
 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
-								&& /bin/pwd)
+								&& pwd)
 $(if $(KBUILD_OUTPUT),, \
      $(error failed to create output directory "$(saved-output)"))
 
@@ -474,6 +474,38 @@ ifneq ($(KBUILD_SRC),)
 	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 endif
 
+ifeq ($(cc-name),clang)
+ifneq ($(CROSS_COMPILE),)
+CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
+GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
+endif
+ifneq ($(GCC_TOOLCHAIN),)
+CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
+endif
+KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
+KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
+KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
+KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
+KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
+KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
+# Quiet clang warning: comparison of unsigned expression < 0 is always false
+KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
+# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
+# source of a reference will be _MergedGlobals and not on of the whitelisted names.
+# See modpost pattern 2
+KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
+KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
+KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
+KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
+else
+
+# These warnings generated too much noise in a regular build.
+# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
+endif
+
 ifeq ($(config-targets),1)
 # ===========================================================================
 # *config targets only - make sure prerequisites are updated, and descend
@@ -684,38 +716,6 @@ ifdef CONFIG_CC_STACKPROTECTOR
 endif
 KBUILD_CFLAGS += $(stackp-flag)
 
-ifeq ($(cc-name),clang)
-ifneq ($(CROSS_COMPILE),)
-CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
-GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
-endif
-ifneq ($(GCC_TOOLCHAIN),)
-CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
-endif
-KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
-KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
-KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
-KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
-KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
-KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
-# Quiet clang warning: comparison of unsigned expression < 0 is always false
-KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
-# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
-# source of a reference will be _MergedGlobals and not on of the whitelisted names.
-# See modpost pattern 2
-KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
-KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
-KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
-KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
-else
-
-# These warnings generated too much noise in a regular build.
-# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
-endif
-
 ifdef CONFIG_FRAME_POINTER
 KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 else
@@ -1009,7 +1009,7 @@ $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
 
 PHONY += $(vmlinux-dirs)
 $(vmlinux-dirs): prepare scripts
-	$(Q)$(MAKE) $(build)=$@
+	$(Q)$(MAKE) $(build)=$@ need-builtin=1
 
 define filechk_kernel.release
 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
@@ -1337,8 +1337,9 @@ package-dir	:= scripts/package
 	$(Q)$(MAKE) $(build)=$(package-dir) $@
 %pkg: include/config/kernel.release FORCE
 	$(Q)$(MAKE) $(build)=$(package-dir) $@
-rpm: include/config/kernel.release FORCE
-	$(Q)$(MAKE) $(build)=$(package-dir) $@
+rpm: rpm-pkg
+	@echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
+	@echo "           Please use \"rpm-pkg\" instead."
 
 
 # Brief documentation of the typical targets used
@@ -1546,9 +1547,9 @@ clean: $(clean-dirs)
 	$(call cmd,rmdirs)
 	$(call cmd,rmfiles)
 	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
-		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
+		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
-		-o -name '*.dwo'  \
+		-o -name '*.dwo' -o -name '*.lst' \
 		-o -name '*.su'  \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 		-o -name '*.symtypes' -o -name 'modules.order' \

arch/arm/mach-uniphier/Makefile

@@ -1 +0,0 @@
-obj- += dummy.o

arch/mips/boot/dts/brcm/Makefile

@@ -35,6 +35,3 @@ dtb-$(CONFIG_DT_NONE) += \
 	bcm97435svmb.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/cavium-octeon/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_CAVIUM_OCTEON_SOC)	+= octeon_3xxx.dtb octeon_68xx.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/img/Makefile

@@ -3,6 +3,3 @@ dtb-$(CONFIG_FIT_IMAGE_FDT_BOSTON)	+= boston.dtb
 
 dtb-$(CONFIG_MACH_PISTACHIO)	+= pistachio_marduk.dtb
 obj-$(CONFIG_MACH_PISTACHIO)	+= pistachio_marduk.dtb.o
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/ingenic/Makefile

@@ -3,6 +3,3 @@ dtb-$(CONFIG_JZ4740_QI_LB60)	+= qi_lb60.dtb
 dtb-$(CONFIG_JZ4780_CI20)	+= ci20.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/lantiq/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_DT_EASY50712)	+= easy50712.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/mti/Makefile

@@ -3,6 +3,3 @@ dtb-$(CONFIG_MIPS_MALTA)	+= malta.dtb
 dtb-$(CONFIG_LEGACY_BOARD_SEAD3)	+= sead3.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/netlogic/Makefile

@@ -6,6 +6,3 @@ dtb-$(CONFIG_DT_XLP_GVP)	+= xlp_gvp.dtb
 dtb-$(CONFIG_DT_XLP_RVP)	+= xlp_rvp.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/ni/Makefile

@@ -1,4 +1 @@
 dtb-$(CONFIG_FIT_IMAGE_FDT_NI169445)	+= 169445.dtb
-
-# Force kbuild to make empty built-in.o if necessary
-obj-					+= dummy.o

arch/mips/boot/dts/pic32/Makefile

@@ -5,6 +5,3 @@ dtb-$(CONFIG_DTB_PIC32_NONE)		+= \
 					pic32mzda_sk.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/qca/Makefile

@@ -5,6 +5,3 @@ dtb-$(CONFIG_ATH79)			+= ar9331_dpt_module.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_dragino_ms14.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_omega.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_tl_mr3020.dtb
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/ralink/Makefile

@@ -7,6 +7,3 @@ dtb-$(CONFIG_DTB_OMEGA2P)	+= omega2p.dtb
 dtb-$(CONFIG_DTB_VOCORE2)	+= vocore2.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

arch/mips/boot/dts/xilfpga/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_FIT_IMAGE_FDT_XILFPGA)	+= nexys4ddr.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

firmware/Makefile

@@ -59,6 +59,3 @@ endif
 
 targets := $(patsubst $(obj)/%,%, \
                                 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
-# Without this, built-in.o won't be created when it's empty, and the
-# final vmlinux link will fail.
-obj- := dummy

samples/bpf/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := test_lru_dist
 hostprogs-y += sock_example

samples/hidraw/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := hid-example
 

samples/seccomp/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 hostprogs-$(CONFIG_SAMPLE_SECCOMP) := bpf-fancy dropper bpf-direct
 
 HOSTCFLAGS_bpf-fancy.o += -I$(objtree)/usr/include

samples/sockmap/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := sockmap
 

samples/statx/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-$(CONFIG_SAMPLE_STATX) := test-statx
 

samples/uhid/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := uhid-example
 

scripts/Makefile.build

@@ -76,7 +76,7 @@ lib-target := $(obj)/lib.a
 obj-y += $(obj)/lib-ksyms.o
 endif
 
-ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
+ifneq ($(strip $(obj-y) $(need-builtin)),)
 builtin-target := $(obj)/built-in.o
 endif
 
@@ -566,7 +566,7 @@ targets := $(filter-out $(PHONY), $(targets))
 
 PHONY += $(subdir-ym)
 $(subdir-ym):
-	$(Q)$(MAKE) $(build)=$@
+	$(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
 
 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 # ---------------------------------------------------------------------------

scripts/Makefile.lib

@@ -57,7 +57,7 @@ multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
 
 # Replace multi-part objects by their individual parts, look at local dir only
-real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
+real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
 
 # DTB

scripts/coccicheck

@@ -30,12 +30,6 @@ else
 	VERBOSE=0
 fi
 
-if [ -z "$J" ]; then
-	NPROC=$(getconf _NPROCESSORS_ONLN)
-else
-	NPROC="$J"
-fi
-
 FLAGS="--very-quiet"
 
 # You can use SPFLAGS to append extra arguments to coccicheck or override any
@@ -70,13 +64,22 @@ if [ "$C" = "1" -o "$C" = "2" ]; then
     # Take only the last argument, which is the C file to test
     shift $(( $# - 1 ))
     OPTIONS="$COCCIINCLUDE $1"
+
+    # No need to parallelize Coccinelle since this mode takes one input file.
+    NPROC=1
 else
     ONLINE=0
     if [ "$KBUILD_EXTMOD" = "" ] ; then
         OPTIONS="--dir $srctree $COCCIINCLUDE"
     else
         OPTIONS="--dir $KBUILD_EXTMOD $COCCIINCLUDE"
     fi
+
+    if [ -z "$J" ]; then
+        NPROC=$(getconf _NPROCESSORS_ONLN)
+    else
+        NPROC="$J"
+    fi
 fi
 
 if [ "$KBUILD_EXTMOD" != "" ] ; then

scripts/kconfig/symbol.c

@@ -1061,7 +1061,7 @@ struct symbol **sym_re_search(const char *pattern)
 	}
 	if (sym_match_arr) {
 		qsort(sym_match_arr, cnt, sizeof(struct sym_match), sym_rel_comp);
-		sym_arr = malloc((cnt+1) * sizeof(struct symbol));
+		sym_arr = malloc((cnt+1) * sizeof(struct symbol *));
 		if (!sym_arr)
 			goto sym_re_search_free;
 		for (i = 0; i < cnt; i++)

scripts/package/Makefile

@@ -39,14 +39,13 @@ if test "$(objtree)" != "$(srctree)"; then \
 	false; \
 fi ; \
 $(srctree)/scripts/setlocalversion --save-scmversion; \
-ln -sf $(srctree) $(2); \
 tar -cz $(RCS_TAR_IGNORE) -f $(2).tar.gz \
-	$(addprefix $(2)/,$(TAR_CONTENT) $(3)); \
-rm -f $(2) $(objtree)/.scmversion
+	--transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3); \
+rm -f $(objtree)/.scmversion
 
 # rpm-pkg
 # ---------------------------------------------------------------------------
-rpm-pkg rpm: FORCE
+rpm-pkg: FORCE
 	$(MAKE) clean
 	$(CONFIG_SHELL) $(MKSPEC) >$(objtree)/kernel.spec
 	$(call cmd,src_tar,$(KERNELPATH),kernel.spec)

tools/power/cpupower/Makefile

@@ -26,7 +26,7 @@ endif
 
 ifneq ($(OUTPUT),)
 # check that the output directory actually exists
-OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
+OUTDIR := $(shell cd $(OUTPUT) && pwd)
 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
 endif
 

tools/scripts/Makefile.include

@@ -13,7 +13,7 @@ endif
 
 # check that the output directory actually exists
 ifneq ($(OUTPUT),)
-OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
+OUTDIR := $(shell cd $(OUTPUT) && pwd)
 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
 endif