From ed7ceac157c27bdc64e79a3229f5ab6e8899597f Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sat, 20 Aug 2022 18:15:28 +0900 Subject: kbuild: add phony targets to ./Kbuild missing-syscalls and old-atomics are meant to be phony targets. Adding them to always-y is odd. (always-y should generate something). Add a new phony target 'prepare', which depends on all the other. Signed-off-by: Masahiro Yamada --- Kbuild | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) (limited to 'Kbuild') diff --git a/Kbuild b/Kbuild index fa441b98c9f6..e122d93cee32 100644 --- a/Kbuild +++ b/Kbuild @@ -2,18 +2,18 @@ # # Kbuild for top-level directory of the kernel -##### +# Prepare global headers and check sanity before descending into sub-directories +# --------------------------------------------------------------------------- + # Generate bounds.h bounds-file := include/generated/bounds.h -always-y := $(bounds-file) targets := kernel/bounds.s $(bounds-file): kernel/bounds.s FORCE $(call filechk,offsets,__LINUX_BOUNDS_H__) -##### # Generate timeconst.h timeconst-file := include/generated/timeconst.h @@ -23,12 +23,10 @@ filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $< $(timeconst-file): kernel/time/timeconst.bc FORCE $(call filechk,gentimeconst) -##### # Generate asm-offsets.h offsets-file := include/generated/asm-offsets.h -always-y += $(offsets-file) targets += arch/$(SRCARCH)/kernel/asm-offsets.s arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file) @@ -36,24 +34,26 @@ arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file) $(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE $(call filechk,offsets,__ASM_OFFSETS_H__) -##### # Check for missing system calls -always-y += missing-syscalls - quiet_cmd_syscalls = CALL $< cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) -missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE +PHONY += missing-syscalls +missing-syscalls: scripts/checksyscalls.sh $(offsets-file) $(call cmd,syscalls) -##### # Check atomic headers are up-to-date -always-y += old-atomics - quiet_cmd_atomics = CALL $< cmd_atomics = $(CONFIG_SHELL) $< -old-atomics: scripts/atomic/check-atomics.sh FORCE +PHONY += old-atomics +old-atomics: scripts/atomic/check-atomics.sh $(call cmd,atomics) + +# A phony target that depends on all the preparation targets + +PHONY += prepare +prepare: $(offsets-file) missing-syscalls old-atomics + @: -- cgit v1.2.3-58-ga151 From b10fdeea8cf42c0d97b337e9e501c92da4389a03 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sat, 20 Aug 2022 18:15:29 +0900 Subject: kbuild: check sha1sum just once for each atomic header It is unneeded to check the sha1sum every time. Create the timestamp files to manage it. Add '.' to clean-dirs because 'make clean' must visit ./Kbuild to clean up the timestamp files. Signed-off-by: Masahiro Yamada --- Kbuild | 33 ++++++++++++++++++++++++--------- Makefile | 2 +- scripts/atomic/check-atomics.sh | 33 --------------------------------- 3 files changed, 25 insertions(+), 43 deletions(-) delete mode 100755 scripts/atomic/check-atomics.sh (limited to 'Kbuild') diff --git a/Kbuild b/Kbuild index e122d93cee32..0b9e8a16a621 100644 --- a/Kbuild +++ b/Kbuild @@ -43,17 +43,32 @@ PHONY += missing-syscalls missing-syscalls: scripts/checksyscalls.sh $(offsets-file) $(call cmd,syscalls) -# Check atomic headers are up-to-date - -quiet_cmd_atomics = CALL $< - cmd_atomics = $(CONFIG_SHELL) $< - -PHONY += old-atomics -old-atomics: scripts/atomic/check-atomics.sh - $(call cmd,atomics) +# Check the manual modification of atomic headers + +quiet_cmd_check_sha1 = CHKSHA1 $< + cmd_check_sha1 = \ + if ! command -v sha1sum >/dev/null; then \ + echo "warning: cannot check the header due to sha1sum missing"; \ + exit 0; \ + fi; \ + if [ "$$(sed -n '$$s:// ::p' $<)" != \ + "$$(sed '$$d' $< | sha1sum | sed 's/ .*//')" ]; then \ + echo "error: $< has been modified." >&2; \ + exit 1; \ + fi; \ + touch $@ + +atomic-checks += $(addprefix $(obj)/.checked-, \ + atomic-arch-fallback.h \ + atomic-instrumented.h \ + atomic-long.h) + +targets += $(atomic-checks) +$(atomic-checks): $(obj)/.checked-%: include/linux/atomic/% FORCE + $(call if_changed,check_sha1) # A phony target that depends on all the preparation targets PHONY += prepare -prepare: $(offsets-file) missing-syscalls old-atomics +prepare: $(offsets-file) missing-syscalls $(atomic-checks) @: diff --git a/Makefile b/Makefile index a42b121d1cd5..22a4afd51285 100644 --- a/Makefile +++ b/Makefile @@ -1110,7 +1110,7 @@ vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ $(libs-y) $(libs-m))) build-dirs := $(vmlinux-dirs) -clean-dirs := $(sort $(vmlinux-dirs) Documentation \ +clean-dirs := $(sort $(vmlinux-dirs) Documentation . \ $(patsubst %/,%,$(filter %/, $(core-) \ $(drivers-) $(libs-)))) diff --git a/scripts/atomic/check-atomics.sh b/scripts/atomic/check-atomics.sh deleted file mode 100755 index 0e7bab3eb0d1..000000000000 --- a/scripts/atomic/check-atomics.sh +++ /dev/null @@ -1,33 +0,0 @@ -#!/bin/sh -# SPDX-License-Identifier: GPL-2.0 -# -# Check if atomic headers are up-to-date - -ATOMICDIR=$(dirname $0) -ATOMICTBL=${ATOMICDIR}/atomics.tbl -LINUXDIR=${ATOMICDIR}/../.. - -echo '' | sha1sum - > /dev/null 2>&1 -if [ $? -ne 0 ]; then - printf "sha1sum not available, skipping atomic header checks.\n" - exit 0 -fi - -cat < Date: Sun, 25 Sep 2022 03:19:10 +0900 Subject: kbuild: list sub-directories in ./Kbuild Use the ordinary obj-y syntax to list subdirectories. Note1: Previously, the link order of lib-y depended on CONFIG_MODULES; lib-y was linked before drivers-y when CONFIG_MODULES=y, otherwise after drivers-y. This was a bug of commit 7273ad2b08f8 ("kbuild: link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y"), but it was not a big deal after all. Now, all objects listed in lib-y are linked last, irrespective of CONFIG_MODULES. Note2: Finally, the single target build in arch/*/lib/ works correctly. There was a bug report about this. [1] $ make ARCH=arm arch/arm/lib/findbit.o CALL scripts/checksyscalls.sh AS arch/arm/lib/findbit.o [1]: https://lore.kernel.org/linux-kbuild/YvUQOwL6lD4%2F5%2FU6@shell.armlinux.org.uk/ Signed-off-by: Masahiro Yamada Tested-by: Nick Desaulniers Reviewed-by: Nicolas Schier --- Kbuild | 24 ++++++++++++++++++++ Makefile | 63 +++++++++++++++++----------------------------------- scripts/Makefile.lib | 2 ++ 3 files changed, 46 insertions(+), 43 deletions(-) (limited to 'Kbuild') diff --git a/Kbuild b/Kbuild index 0b9e8a16a621..8a37584d1fd6 100644 --- a/Kbuild +++ b/Kbuild @@ -72,3 +72,27 @@ $(atomic-checks): $(obj)/.checked-%: include/linux/atomic/% FORCE PHONY += prepare prepare: $(offsets-file) missing-syscalls $(atomic-checks) @: + +# Ordinary directory descending +# --------------------------------------------------------------------------- + +obj-y += init/ +obj-y += usr/ +obj-y += arch/$(SRCARCH)/ +obj-y += $(ARCH_CORE) +obj-y += kernel/ +obj-y += certs/ +obj-y += mm/ +obj-y += fs/ +obj-y += ipc/ +obj-y += security/ +obj-y += crypto/ +obj-$(CONFIG_BLOCK) += block/ +obj-$(CONFIG_IO_URING) += io_uring/ +obj-y += $(ARCH_LIB) +obj-y += drivers/ +obj-y += sound/ +obj-$(CONFIG_SAMPLES) += samples/ +obj-$(CONFIG_NET) += net/ +obj-y += virt/ +obj-y += $(ARCH_DRIVERS) diff --git a/Makefile b/Makefile index 09c9d9a005bd..317e9f09440c 100644 --- a/Makefile +++ b/Makefile @@ -676,11 +676,8 @@ endif ifeq ($(KBUILD_EXTMOD),) # Objects we will link into vmlinux / subdirs we need to visit -core-y := init/ usr/ arch/$(SRCARCH)/ -drivers-y := drivers/ sound/ -drivers-$(CONFIG_SAMPLES) += samples/ -drivers-$(CONFIG_NET) += net/ -drivers-y += virt/ +core-y := +drivers-y := libs-y := lib/ endif # KBUILD_EXTMOD @@ -1099,31 +1096,24 @@ 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/ -core-$(CONFIG_BLOCK) += block/ -core-$(CONFIG_IO_URING) += io_uring/ -vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ - $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ - $(libs-y) $(libs-m))) - -build-dirs := $(vmlinux-dirs) -clean-dirs := $(sort $(vmlinux-dirs) Documentation . \ +build-dir := . +clean-dirs := $(sort . Documentation \ $(patsubst %/,%,$(filter %/, $(core-) \ $(drivers-) $(libs-)))) -subdir-modorder := $(addsuffix /modules.order, $(build-dirs)) - +export ARCH_CORE := $(core-y) +export ARCH_LIB := $(filter %/, $(libs-y)) +export ARCH_DRIVERS := $(drivers-y) $(drivers-m) # Externally visible symbols (used by link-vmlinux.sh) -KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y)) -KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y))) + +KBUILD_VMLINUX_OBJS := $(head-y) ./built-in.a ifdef CONFIG_MODULES KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) else KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) endif -KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y)) export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds @@ -1138,7 +1128,7 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS # (this can be evaluated only once include/config/auto.conf has been included) KBUILD_MODULES := 1 -autoksyms_recursive: descend modules.order +autoksyms_recursive: $(build-dir) modules.order $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" endif @@ -1166,7 +1156,7 @@ targets := vmlinux # The actual objects are generated when descending, # make sure no implicit rule kicks in -$(sort $(vmlinux-deps) $(subdir-modorder)): descend ; +$(sort $(vmlinux-deps)): . ; filechk_kernel.release = \ echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" @@ -1437,13 +1427,6 @@ endif modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_prepare -cmd_modules_order = cat $(real-prereqs) > $@ - -modules.order: $(subdir-modorder) FORCE - $(call if_changed,modules_order) - -targets += modules.order - # Target to prepare building external modules modules_prepare: prepare $(Q)$(MAKE) $(build)=scripts scripts/module.lds @@ -1714,9 +1697,7 @@ else # KBUILD_EXTMOD KBUILD_BUILTIN := KBUILD_MODULES := 1 -build-dirs := $(KBUILD_EXTMOD) -$(MODORDER): descend - @: +build-dir := $(KBUILD_EXTMOD) compile_commands.json: $(extmod_prefix)compile_commands.json PHONY += compile_commands.json @@ -1754,6 +1735,9 @@ PHONY += modules modules_install modules_prepare ifdef CONFIG_MODULES +$(MODORDER): $(build-dir) + @: + modules: modules_check $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost @@ -1807,7 +1791,7 @@ single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ $(single-ko): single_modpost @: -$(single-no-ko): descend +$(single-no-ko): $(build-dir) @: # Remove MODORDER when done because it is not the real one. @@ -1817,24 +1801,17 @@ single_modpost: $(single-no-ko) modules_prepare $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $(Q)rm -f $(MODORDER) -single-goals := $(addprefix $(extmod_prefix), $(single-no-ko)) - -# trim unrelated directories -build-dirs := $(foreach d, $(build-dirs), \ - $(if $(filter $d/%, $(single-goals)), $d)) +single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) endif -# Handle descending into subdirectories listed in $(build-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 += descend $(build-dirs) -descend: $(build-dirs) -$(build-dirs): prepare - $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 \ - $(filter $@/%, $(single-goals)) +PHONY += $(build-dir) +$(build-dir): prepare + $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) clean-dirs := $(addprefix _clean_, $(clean-dirs)) PHONY += $(clean-dirs) clean diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 52811b2783de..b7e650bc70f2 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -89,6 +89,7 @@ always-y += $(dtb-y) # Add subdir path +ifneq ($(obj),.) extra-y := $(addprefix $(obj)/,$(extra-y)) always-y := $(addprefix $(obj)/,$(always-y)) targets := $(addprefix $(obj)/,$(targets)) @@ -100,6 +101,7 @@ multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y)) real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y)) subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) +endif # Finds the multi-part object the current object will be linked into. # If the object belongs to two or more multi-part objects, list them all. -- cgit v1.2.3-58-ga151