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kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES}

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KBUILD_BUILTIN is set to 1 unless you are building only modules.

KBUILD_MODULES is set to 1 when you are building only modules
(a typical use case is "make modules").

It is more useful to set them to 'y' instead, so we can do
something like:

    always-$(KBUILD_BUILTIN) += vmlinux.lds

This works equivalently to:

    extra-y                  += vmlinux.lds

This allows us to deprecate extra-y. extra-y and always-y are quite
similar, and we do not need both.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
This commit is contained in:
Masahiro Yamada
2025-06-03 03:12:53 +09:00
parent 481d5c31e1
commit 1bf807b8f7
2 changed files with 12 additions and 8 deletions
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4
Documentation/kbuild/makefiles.rst
View File

@@ -291,6 +291,10 @@ Example::
# arch/x86/kernel/Makefile
extra-y += vmlinux.lds
extra-y is now deprecated because this is equivalent to:
always-$(KBUILD_BUILTIN) += vmlinux.lds
$(extra-y) should only contain targets needed for vmlinux.
Kbuild skips extra-y when vmlinux is apparently not a final goal.

16
Makefile
View File

@@ -749,7 +749,7 @@ targets :=
# Normally, just do built-in.
KBUILD_MODULES :=
KBUILD_BUILTIN := 1
KBUILD_BUILTIN := y
# If we have only "make modules", don't compile built-in objects.
ifeq ($(MAKECMDGOALS),modules)
@@ -761,11 +761,11 @@ endif
# Just "make" or "make all" shall build modules as well
ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
KBUILD_MODULES := 1
KBUILD_MODULES := y
endif
ifeq ($(MAKECMDGOALS),)
KBUILD_MODULES := 1
KBUILD_MODULES := y
endif
export KBUILD_MODULES KBUILD_BUILTIN
@@ -1193,7 +1193,7 @@ export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
ifdef CONFIG_TRIM_UNUSED_KSYMS
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
KBUILD_MODULES := 1
KBUILD_MODULES := y
endif
# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
@@ -1533,7 +1533,7 @@ all: modules
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.
ifdef CONFIG_MODVERSIONS
KBUILD_BUILTIN := 1
KBUILD_BUILTIN := y
endif
# Build modules
@@ -1542,7 +1542,7 @@ endif
# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
# is an exception.
ifdef CONFIG_DEBUG_INFO_BTF_MODULES
KBUILD_BUILTIN := 1
KBUILD_BUILTIN := y
modules: vmlinux
endif
@@ -1858,7 +1858,7 @@ filechk_kernel.release = echo $(KERNELRELEASE)
# We are always building only modules.
KBUILD_BUILTIN :=
KBUILD_MODULES := 1
KBUILD_MODULES := y
build-dir := .
@@ -1986,7 +1986,7 @@ endif
single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
KBUILD_MODULES := 1
KBUILD_MODULES := y
endif