forked from Minki/linux
5750121ae7
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 7273ad2b08 ("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 <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
99 lines
2.5 KiB
Makefile
99 lines
2.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Kbuild for top-level directory of the kernel
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# Prepare global headers and check sanity before descending into sub-directories
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# ---------------------------------------------------------------------------
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# Generate bounds.h
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bounds-file := include/generated/bounds.h
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targets := kernel/bounds.s
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$(bounds-file): kernel/bounds.s FORCE
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$(call filechk,offsets,__LINUX_BOUNDS_H__)
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# Generate timeconst.h
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timeconst-file := include/generated/timeconst.h
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filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
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$(timeconst-file): kernel/time/timeconst.bc FORCE
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$(call filechk,gentimeconst)
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# Generate asm-offsets.h
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offsets-file := include/generated/asm-offsets.h
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targets += arch/$(SRCARCH)/kernel/asm-offsets.s
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arch/$(SRCARCH)/kernel/asm-offsets.s: $(timeconst-file) $(bounds-file)
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$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
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$(call filechk,offsets,__ASM_OFFSETS_H__)
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# Check for missing system calls
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quiet_cmd_syscalls = CALL $<
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cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
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PHONY += missing-syscalls
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file)
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$(call cmd,syscalls)
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# Check the manual modification of atomic headers
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quiet_cmd_check_sha1 = CHKSHA1 $<
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cmd_check_sha1 = \
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if ! command -v sha1sum >/dev/null; then \
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echo "warning: cannot check the header due to sha1sum missing"; \
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exit 0; \
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fi; \
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if [ "$$(sed -n '$$s:// ::p' $<)" != \
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"$$(sed '$$d' $< | sha1sum | sed 's/ .*//')" ]; then \
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echo "error: $< has been modified." >&2; \
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exit 1; \
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fi; \
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touch $@
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atomic-checks += $(addprefix $(obj)/.checked-, \
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atomic-arch-fallback.h \
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atomic-instrumented.h \
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atomic-long.h)
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targets += $(atomic-checks)
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$(atomic-checks): $(obj)/.checked-%: include/linux/atomic/% FORCE
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$(call if_changed,check_sha1)
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# A phony target that depends on all the preparation targets
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PHONY += prepare
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prepare: $(offsets-file) missing-syscalls $(atomic-checks)
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@:
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# Ordinary directory descending
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# ---------------------------------------------------------------------------
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obj-y += init/
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obj-y += usr/
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obj-y += arch/$(SRCARCH)/
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obj-y += $(ARCH_CORE)
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obj-y += kernel/
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obj-y += certs/
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obj-y += mm/
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obj-y += fs/
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obj-y += ipc/
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obj-y += security/
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obj-y += crypto/
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obj-$(CONFIG_BLOCK) += block/
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obj-$(CONFIG_IO_URING) += io_uring/
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obj-y += $(ARCH_LIB)
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obj-y += drivers/
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obj-y += sound/
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obj-$(CONFIG_SAMPLES) += samples/
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obj-$(CONFIG_NET) += net/
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obj-y += virt/
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obj-y += $(ARCH_DRIVERS)
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