From aeb709c767aeca996e6011133e4f7bdb2a4af652 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Wed, 30 Sep 2026 09:59:20 +0000 Subject: selftests/bpf: Add a test for objects stuck in free_by_rcu_ttrace Delete all elements of BPF_F_NO_PREALLOC hash map in one batch. The first free_bulk() starts RCU tasks trace GP and the rest of the elements are freed while it's in flight. Wait for call_rcu_ttrace_in_progress to clear in bpf_mem_cache of every cpu and check that free_by_rcu_ttrace and waiting_for_gp_ttrace lists are empty. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20260930095920.601738-4-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- scripts/Makefile.build | 598 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 598 insertions(+) create mode 100644 scripts/Makefile.build (limited to 'scripts/Makefile.build') diff --git a/scripts/Makefile.build b/scripts/Makefile.build new file mode 100644 index 000000000..4349108e7 --- /dev/null +++ b/scripts/Makefile.build @@ -0,0 +1,598 @@ +# SPDX-License-Identifier: GPL-2.0 +# ========================================================================== +# Building +# ========================================================================== + +src := $(srcroot)/$(obj) + +PHONY := $(obj)/ +$(obj)/: + +# Init all relevant variables used in kbuild files so +# 1) they have correct type +# 2) they do not inherit any value from the environment +obj-y := +obj-m := +lib-y := +lib-m := +always-y := +always-m := +targets := +subdir-y := +subdir-m := +asflags-y := +ccflags-y := +rustflags-y := +cppflags-y := +ldflags-y := + +subdir-asflags-y := +subdir-ccflags-y := +subdir-rustflags-y := + +# Read auto.conf if it exists, otherwise ignore +-include $(objtree)/include/config/auto.conf + +include $(srctree)/scripts/Kbuild.include +include $(srctree)/scripts/Makefile.compiler +include $(kbuild-file) +include $(srctree)/scripts/Makefile.lib + +# flags that take effect in current and sub directories +KBUILD_AFLAGS += $(subdir-asflags-y) +KBUILD_CFLAGS += $(subdir-ccflags-y) +KBUILD_RUSTFLAGS += $(subdir-rustflags-y) + +# Figure out what we need to build from the various variables +# =========================================================================== + +# When an object is listed to be built compiled-in and modular, +# only build the compiled-in version +obj-m := $(filter-out $(obj-y),$(obj-m)) + +# Libraries are always collected in one lib file. +# Filter out objects already built-in +lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) + +# Subdirectories we need to descend into +subdir-ym := $(sort $(subdir-y) $(subdir-m) \ + $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) + +# Handle objects in subdirs: +# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and +# foo/modules.order +# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order +# +# Generate modules.order to determine modorder. Unfortunately, we don't have +# information about ordering between -y and -m subdirs. Just put -y's first. + +ifdef need-modorder +obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) +else +obj-m := $(filter-out %/, $(obj-m)) +endif + +ifdef need-builtin +obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) +else +obj-y := $(filter-out %/, $(obj-y)) +endif + +# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals +suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s)))) +# List composite targets that are constructed by combining other targets +multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m))) +# List primitive targets that are compiled from source files +real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) + +# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object +multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) +multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) +multi-obj-ym := $(multi-obj-y) $(multi-obj-m) + +# Replace multi-part objects by their individual parts, +# including built-in.a from subdirectories +real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) +real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) + +always-y += $(always-m) + +# hostprogs-always-y += foo +# ... is a shorthand for +# hostprogs += foo +# always-y += foo +hostprogs += $(hostprogs-always-y) $(hostprogs-always-m) +always-y += $(hostprogs-always-y) $(hostprogs-always-m) + +# userprogs-always-y is likewise. +userprogs += $(userprogs-always-y) $(userprogs-always-m) +always-y += $(userprogs-always-y) $(userprogs-always-m) + +# Add subdir path + +ifneq ($(obj),.) +extra-y := $(addprefix $(obj)/, $(extra-y)) +always-y := $(addprefix $(obj)/, $(always-y)) +targets := $(addprefix $(obj)/, $(targets)) +obj-m := $(addprefix $(obj)/, $(obj-m)) +lib-y := $(addprefix $(obj)/, $(lib-y)) +real-obj-y := $(addprefix $(obj)/, $(real-obj-y)) +real-obj-m := $(addprefix $(obj)/, $(real-obj-m)) +multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) +subdir-ym := $(addprefix $(obj)/, $(subdir-ym)) +endif + +ifndef obj +$(warning kbuild: Makefile.build is included improperly) +endif + +ifeq ($(need-modorder),) +ifneq ($(obj-m),) +$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.) +$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.) +endif +endif + +# =========================================================================== + +# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...) +subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y))) +subdir-modorder := $(sort $(filter %/modules.order, $(obj-m))) + +targets-for-builtin := $(extra-y) + +ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) +targets-for-builtin += $(obj)/lib.a +endif + +ifdef need-builtin +targets-for-builtin += $(obj)/built-in.a +endif + +targets-for-modules := $(foreach x, o mod, \ + $(patsubst %.o, %.$x, $(filter %.o, $(obj-m)))) + +ifdef need-modorder +targets-for-modules += $(obj)/modules.order +endif + +targets += $(targets-for-builtin) $(targets-for-modules) + +# Linus' kernel sanity checking tool +ifeq ($(KBUILD_CHECKSRC),1) + quiet_cmd_checksrc = CHECK $(patsubst $(srctree)/%,%,$<) + cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< +else ifeq ($(KBUILD_CHECKSRC),2) + quiet_cmd_force_checksrc = CHECK $(patsubst $(srctree)/%,%,$<) + cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< +endif + +ifeq ($(KBUILD_EXTMOD),) +ifneq ($(KBUILD_EXTRA_WARN),) + cmd_checkdoc = PYTHONDONTWRITEBYTECODE=1 $(PYTHON3) $(KERNELDOC) -none $(KDOCFLAGS) \ + $(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \ + $< +endif +endif + +# Compile C sources (.c) +# --------------------------------------------------------------------------- + +quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ + cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $< + +$(obj)/%.s: $(obj)/%.c FORCE + $(call if_changed_dep,cc_s_c) + +quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ +cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< + +$(obj)/%.i: $(obj)/%.c FORCE + $(call if_changed_dep,cpp_i_c) + +getexportsymbols = $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/$(1)/p' + +gendwarfksyms = $(objtree)/scripts/gendwarfksyms/gendwarfksyms \ + $(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes)) \ + $(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable) + +genksyms = $(objtree)/scripts/genksyms/genksyms \ + $(if $(KBUILD_SYMTYPES), -T $(@:.o=.symtypes)) \ + $(if $(KBUILD_PRESERVE), -p) \ + $(addprefix -r , $(wildcard $(@:.o=.symref))) + +# These mirror gensymtypes_S and co below, keep them in synch. +ifdef CONFIG_GENDWARFKSYMS +cmd_gensymtypes_c = $(if $(skip_gendwarfksyms),, \ + $(call getexportsymbols,\1) | $(gendwarfksyms) $@) +else +cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms) +endif # CONFIG_GENDWARFKSYMS + +# LLVM assembly +# Generate .ll files from .c +quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ + cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $< + +$(obj)/%.ll: $(obj)/%.c FORCE + $(call if_changed_dep,cc_ll_c) + +# C (.c) files +# The C file is compiled and updated dependency information is generated. +# (See cmd_cc_o_c + relevant part of rule_cc_o_c) + +is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y) + +ifdef CONFIG_MODVERSIONS +# When module versioning is enabled the following steps are executed: +# o compile a .o from .c +# o if .o doesn't contain a __export_symbol_*, i.e. does +# not export symbols, it's done. +# o otherwise, we calculate symbol versions using the good old +# genksyms on the preprocessed source and dump them into the .cmd file. +# o modpost will extract versions from that file and create *.c files that will +# be compiled and linked to the kernel and/or modules. + +gen_symversions = \ + if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \ + $(cmd_gensymtypes_$1) >> $(dot-target).cmd; \ + fi + +cmd_gen_symversions_c = $(call gen_symversions,c) + +endif + +ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT +# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl +ifdef BUILD_C_RECORDMCOUNT +ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") + RECORDMCOUNT_FLAGS = -w +endif +# Due to recursion, we must skip empty.o. +# The empty.o file is created in the make process in order to determine +# the target endianness and word size. It is made before all other C +# files, including recordmcount. +sub_cmd_record_mcount = \ + if [ $(@) != "scripts/mod/empty.o" ]; then \ + $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ + fi; +recordmcount_source := $(srctree)/scripts/recordmcount.c \ + $(srctree)/scripts/recordmcount.h +else +sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ + "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ + "$(if $(CONFIG_64BIT),64,32)" \ + "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \ + "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \ + "$(if $(part-of-module),1,0)" "$(@)"; +recordmcount_source := $(srctree)/scripts/recordmcount.pl +endif # BUILD_C_RECORDMCOUNT +cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \ + $(sub_cmd_record_mcount)) +endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT + +# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory +# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file +# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file + +is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(target-stem).o)$(OBJECT_FILES_NON_STANDARD)n),$(is-kernel-object)) + +ifdef CONFIG_OBJTOOL +$(obj)/%.o: private objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y)) +endif + +ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) +cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi))) +endif + +# Built-in and composite module parts +$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE + $(call if_changed_rule,cc_o_c) + $(call cmd,force_checksrc) + +# To make this rule robust against "Argument list too long" error, +# ensure to add $(obj)/ prefix by a shell command. +cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \ + $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@ + +$(obj)/%.mod: FORCE + $(call if_changed,mod) + +quiet_cmd_cc_lst_c = MKLST $@ + cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ + $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ + System.map $(OBJDUMP) > $@ + +$(obj)/%.lst: $(obj)/%.c FORCE + $(call if_changed_dep,cc_lst_c) + +# Compile Rust sources (.rs) +# --------------------------------------------------------------------------- + +# The features in this list are the ones allowed for non-`rust/` code. +# +# - Stable since Rust 1.87.0: `feature(asm_goto)`. +# - Stable since Rust 1.89.0: `feature(generic_arg_infer)`. +# - Expected to become stable: `feature(arbitrary_self_types)`. +# - To be determined: `feature(used_with_arg)`. +# +# Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on +# the unstable features in use. +rust_allowed_features := arbitrary_self_types,asm_goto,generic_arg_infer,used_with_arg + +# `--out-dir` is required to avoid temporaries being created by `rustc` in the +# current working directory, which may be not accessible in the out-of-tree +# modules case. +rust_common_cmd = \ + OBJTREE=$(abspath $(objtree)) \ + RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \ + -Zallow-features=$(rust_allowed_features) \ + -Zcrate-attr=no_std \ + -Zcrate-attr='feature($(rust_allowed_features))' \ + -Zunstable-options --extern pin_init --extern kernel \ + --extern zerocopy --extern zerocopy_derive \ + --crate-type rlib -L $(objtree)/rust/ \ + --sysroot=/dev/null \ + --out-dir $(dir $@) --emit=dep-info=$(depfile) + +# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit +# will be used. We explicitly request `-Ccodegen-units=1` in any case, and +# the compiler shows a warning if it is not 1. However, if we ever stop +# requesting it explicitly and we start using some other `--emit` that does not +# imply it (and for which codegen is performed), then we would be out of sync, +# i.e. the outputs we would get for the different single targets (e.g. `.ll`) +# would not match each other. + +quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ + cmd_rustc_o_rs = $(rust_common_cmd) --emit=$(if $(CONFIG_RUST_INLINE_HELPERS),llvm-bc=$(patsubst %.o,%.bc,$@),obj=$@) $< \ + $(if $(CONFIG_RUST_INLINE_HELPERS),;$(LLVM_LINK) --internalize --suppress-warnings $(patsubst %.o,%.bc,$@) \ + $(objtree)/rust/helpers/helpers$(if $(part-of-module),_module).bc -o $(patsubst %.o,%.m.bc,$@); \ + $(CC) $(CLANG_FLAGS) $(filter-out $(CC_FLAGS_LTO),$(KBUILD_CFLAGS)) \ + $(CC_FLAGS_RUST_INLINE_HELPERS) -Wno-override-module -c $(patsubst %.o,%.m.bc,$@) -o $@ \ + $(cmd_ld_single)) \ + $(cmd_objtool) + +define rule_rustc_o_rs + $(call cmd_and_fixdep,rustc_o_rs) + $(call cmd,gen_objtooldep) +endef + +$(obj)/%.o: $(obj)/%.rs FORCE + +$(call if_changed_rule,rustc_o_rs) + +quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ + cmd_rustc_rsi_rs = \ + $(rust_common_cmd) -Zunpretty=expanded $< >$@; \ + command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) --config-path $(srctree)/.rustfmt.toml $@ + +$(obj)/%.rsi: $(obj)/%.rs FORCE + +$(call if_changed_dep,rustc_rsi_rs) + +quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ + cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $< + +$(obj)/%.s: $(obj)/%.rs FORCE + +$(call if_changed_dep,rustc_s_rs) + +quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@ + cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $< + +$(obj)/%.ll: $(obj)/%.rs FORCE + +$(call if_changed_dep,rustc_ll_rs) + +quiet_cmd_rustc_rs_rs_S = RSCPP $(quiet_modtag) $@ + cmd_rustc_rs_rs_S = $(CPP) $(c_flags) -xc -C -P $< | sed '1,/^\/\/ Cut here.$$/d' >$@ + +$(obj)/%.rs: $(obj)/%.rs.S FORCE + +$(call if_changed_dep,rustc_rs_rs_S) + +# Compile assembler sources (.S) +# --------------------------------------------------------------------------- + +# .S file exports must have their C prototypes defined in asm/asm-prototypes.h +# or a file that it includes, in order to get versioned symbols. We build a +# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from +# the .S file (with trailing ';'), and run genksyms on that, to extract vers. +# +# This is convoluted. The .S file must first be preprocessed to run guards and +# expand names, then the resulting exports must be constructed into plain +# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed +# to make the genksyms input or compiled into an object for gendwarfksyms. +# +# These mirror gensymtypes_c and co above, keep them in synch. +getasmexports = \ + { echo "\#include " ; \ + echo "\#include " ; \ + echo "\#include " ; \ + $(call getexportsymbols,EXPORT_SYMBOL(\1);) ; } + +ifdef CONFIG_GENDWARFKSYMS +cmd_gensymtypes_S = \ + $(getasmexports) | \ + $(CC) $(c_flags) -c -o $(@:.o=.gendwarfksyms.o) -xc -; \ + $(call getexportsymbols,\1) | \ + $(gendwarfksyms) $(@:.o=.gendwarfksyms.o) +else +cmd_gensymtypes_S = \ + $(getasmexports) | \ + $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms) +endif # CONFIG_GENDWARFKSYMS + +quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ +cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< + +$(obj)/%.s: $(obj)/%.S FORCE + $(call if_changed_dep,cpp_s_S) + +ifdef CONFIG_ASM_MODVERSIONS + +# versioning matches the C process described above, with difference that +# we parse asm-prototypes.h C header to get function definitions. + +cmd_gen_symversions_S = $(call gen_symversions,S) + +endif + +$(obj)/%.o: $(obj)/%.S FORCE + $(call if_changed_rule,as_o_S) + +targets += $(filter-out $(subdir-builtin), $(real-obj-y)) +targets += $(filter-out $(subdir-modorder), $(real-obj-m)) +targets += $(lib-y) $(always-y) + +# Linker scripts preprocessor (.lds.S -> .lds) +# --------------------------------------------------------------------------- +quiet_cmd_cpp_lds_S = LDS $@ + cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ + -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< + +$(obj)/%.lds: $(src)/%.lds.S FORCE + $(call if_changed_dep,cpp_lds_S) + +# ASN.1 grammar +# --------------------------------------------------------------------------- +quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch] + cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ + $(basename $@).c $(basename $@).h + +$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler + $(call cmd,asn1_compiler) + +# Build the compiled-in targets +# --------------------------------------------------------------------------- + +# To build objects in subdirs, we need to descend into the directories +$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ; +$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ; + +# +# Rule to compile a set of .o files into one .a file (without symbol table) +# +# To make this rule robust against "Argument list too long" error, +# remove $(obj)/ prefix, and restore it by a shell command. + +quiet_cmd_ar_builtin = AR $@ + cmd_ar_builtin = rm -f $@; \ + $(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \ + $(AR) cDPrST $@ + +$(obj)/built-in.a: $(real-obj-y) FORCE + $(call if_changed,ar_builtin) + +# This is a list of build artifacts from the current Makefile and its +# sub-directories. The timestamp should be updated when any of the member files. + +cmd_gen_order = { $(foreach m, $(real-prereqs), \ + $(if $(filter %/$(notdir $@), $m), cat $m, echo $m);) :; } \ + > $@ + +$(obj)/modules.order: $(obj-m) FORCE + $(call if_changed,gen_order) + +# +# Rule to compile a set of .o files into one .a file (with symbol table) +# + +$(obj)/lib.a: $(lib-y) FORCE + $(call if_changed,ar) + +quiet_cmd_ld_multi_m = LD [M] $@ + cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$< $(cmd_objtool) + +define rule_ld_multi_m + $(call cmd_and_savecmd,ld_multi_m) + $(call cmd,gen_objtooldep) +endef + +$(multi-obj-m): private objtool-enabled := $(delay-objtool) +$(multi-obj-m): private part-of-module := y +$(multi-obj-m): %.o: %.mod FORCE + $(call if_changed_rule,ld_multi_m) +$(call multi_depend, $(multi-obj-m), .o, -objs -y -m) + +# Add intermediate targets: +# When building objects with specific suffix patterns, add intermediate +# targets that the final targets are derived from. +intermediate_targets = $(foreach sfx, $(2), \ + $(patsubst %$(strip $(1)),%$(sfx), \ + $(filter %$(strip $(1)), $(targets)))) +# %.asn1.o <- %.asn1.[ch] <- %.asn1 +targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) + +# Include additional build rules when necessary +# --------------------------------------------------------------------------- + +# $(sort ...) is used here to remove duplicated words and excessive spaces. +hostprogs := $(sort $(hostprogs)) +ifneq ($(hostprogs),) +include $(srctree)/scripts/Makefile.host +endif + +# $(sort ...) is used here to remove duplicated words and excessive spaces. +userprogs := $(sort $(userprogs)) +ifneq ($(userprogs),) +include $(srctree)/scripts/Makefile.userprogs +endif + +# Single targets +# --------------------------------------------------------------------------- + +single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d)) +single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS)) + +$(single-subdir-goals): $(single-subdirs) + @: + +# Descending +# --------------------------------------------------------------------------- + +PHONY += $(subdir-ym) +$(subdir-ym): + $(Q)$(MAKE) $(build)=$@ \ + need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ + need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \ + $(filter $@/%, $(single-subdir-goals)) + +# Add FORCE to the prerequisites of a target to force it to be always rebuilt. +# --------------------------------------------------------------------------- + +PHONY += FORCE + +FORCE: + +targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS)) +targets := $(filter-out $(PHONY), $(targets)) + +# Now that targets is fully known, include dtb rules if needed +ifneq ($(need-dtbslist)$(dtb-y)$(dtb-)$(filter %.dtb %.dtb.o %.dtbo.o,$(targets)),) +include $(srctree)/scripts/Makefile.dtbs +endif + +# Build +# Needs to be after the include of Makefile.dtbs, which updates always-y +# --------------------------------------------------------------------------- + +$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \ + $(if $(KBUILD_MODULES), $(targets-for-modules)) \ + $(subdir-ym) $(always-y) + @: + +# Read all saved command lines and dependencies for the $(targets) we +# may be building above, using $(if_changed{,_dep}). As an +# optimization, we don't need to read them if the target does not +# exist, we will rebuild anyway in that case. + +existing-targets := $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) + +# Create directories for object files if they do not exist +obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets)))) +# If targets exist, their directories apparently exist. Skip mkdir. +existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets)))) +obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs))) +ifneq ($(obj-dirs),) +$(shell mkdir -p $(obj-dirs)) +endif + +.PHONY: $(PHONY) -- cgit v1.3.1