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>
2.5 KiB
SPDX-License-Identifier: GPL-2.0
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
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
filechk_gentimeconst = echo $(CONFIG_HZ) | bc -q $<
$(timeconst-file): kernel/time/timeconst.bc FORCE $(call filechk,gentimeconst)
Generate asm-offsets.h
offsets-file := include/generated/asm-offsets.h
targets += arch/$(SRCARCH)/kernel/asm-offsets.s
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
quiet_cmd_syscalls = CALL $< cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
PHONY += missing-syscalls missing-syscalls: scripts/checksyscalls.sh $(offsets-file) $(call cmd,syscalls)
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 $(atomic-checks) @:
Ordinary directory descending
---------------------------------------------------------------------------
obj-y += init/ obj-y += usr/ obj-y += arch/$(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)