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| author | Masahiro Yamada <masahiroy@kernel.org> | 2024-04-27 17:55:02 +0300 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2024-05-09 22:34:52 +0300 |
| commit | b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0 (patch) | |
| tree | 60cc6428700d3582666b62d1d9dd741656efe1ee /arch/powerpc | |
| parent | 9a0ebe5011f49e932bb0a2cea2034fd65e6e567e (diff) | |
| download | linux-b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0.tar.xz | |
kbuild: use $(src) instead of $(srctree)/$(src) for source directory
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/boot/Makefile | 6 | ||||
| -rw-r--r-- | arch/powerpc/boot/dts/Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/boot/dts/fsl/Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/vdso/Makefile | 4 |
4 files changed, 7 insertions, 9 deletions
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile index 968aee2025b8..a0b3b5cc14cd 100644 --- a/arch/powerpc/boot/Makefile +++ b/arch/powerpc/boot/Makefile @@ -218,7 +218,7 @@ $(addprefix $(obj)/,$(libfdt) $(libfdtheader)): $(obj)/%: $(srctree)/scripts/dtc $(obj)/empty.c: $(Q)touch $@ -$(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds : $(obj)/%: $(srctree)/$(src)/%.S +$(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds : $(obj)/%: $(src)/%.S $(Q)cp $< $@ clean-files := $(zlib-) $(zlibheader-) $(zliblinuxheader-) \ @@ -252,9 +252,9 @@ targets += $(patsubst $(obj)/%,%,$(obj-boot) wrapper.a) zImage.lds extra-y := $(obj)/wrapper.a $(obj-plat) $(obj)/empty.o \ $(obj)/zImage.lds $(obj)/zImage.coff.lds $(obj)/zImage.ps3.lds -dtstree := $(srctree)/$(src)/dts +dtstree := $(src)/dts -wrapper :=$(srctree)/$(src)/wrapper +wrapper := $(src)/wrapper wrapperbits := $(extra-y) $(addprefix $(obj)/,addnote hack-coff mktree) \ $(wrapper) FORCE diff --git a/arch/powerpc/boot/dts/Makefile b/arch/powerpc/boot/dts/Makefile index fb335d05aae8..0cd0d8558b47 100644 --- a/arch/powerpc/boot/dts/Makefile +++ b/arch/powerpc/boot/dts/Makefile @@ -2,5 +2,4 @@ subdir-y += fsl -dtstree := $(srctree)/$(src) -dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts)) +dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(src)/%.dts,%.dtb, $(wildcard $(src)/*.dts)) diff --git a/arch/powerpc/boot/dts/fsl/Makefile b/arch/powerpc/boot/dts/fsl/Makefile index 3bae982641e9..d3ecdf14bc42 100644 --- a/arch/powerpc/boot/dts/fsl/Makefile +++ b/arch/powerpc/boot/dts/fsl/Makefile @@ -1,4 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 -dtstree := $(srctree)/$(src) -dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts)) +dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(src)/%.dts,%.dtb, $(wildcard $(src)/*.dts)) diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile index a14eab366993..7d66b6e07993 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -90,10 +90,10 @@ $(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE $(call if_changed_dep,cc_o_c) # Generate VDSO offsets using helper script -gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh +gen-vdso32sym := $(src)/gen_vdso32_offsets.sh quiet_cmd_vdso32sym = VDSO32SYM $@ cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ -gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh +gen-vdso64sym := $(src)/gen_vdso64_offsets.sh quiet_cmd_vdso64sym = VDSO64SYM $@ cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@ |