01 Apr, 2020
2 commits
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Pull Kbuild updates from Masahiro Yamada:
"Build system:- add CONFIG_UNUSED_KSYMS_WHITELIST, which will be useful to define a
fixed set of export symbols for Generic Kernel Image (GKI)- allow to run 'make dt_binding_check' without .config
- use full schema for checking DT examples in *.yaml files
- make modpost fail for missing MODULE_IMPORT_NS(), which makes more
sense because we know the produced modules are never loadable- Remove unused 'AS' variable
Kconfig:
- sanitize DEFCONFIG_LIST, and remove ARCH_DEFCONFIG from Kconfig
files- relax the 'imply' behavior so that symbols implied by 'y' can
become 'm'- make 'imply' obey 'depends on' in order to make 'imply' really weak
Misc:
- add documentation on building the kernel with Clang/LLVM
- revive __HAVE_ARCH_STRLEN for 32bit sparc to use optimized strlen()
- fix warning from deb-pkg builds when CONFIG_DEBUG_INFO=n
- various script and Makefile cleanups"
* tag 'kbuild-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (34 commits)
Makefile: Update kselftest help information
kbuild: deb-pkg: fix warning when CONFIG_DEBUG_INFO is unset
kbuild: add outputmakefile to no-dot-config-targets
kbuild: remove AS variable
net: wan: wanxl: refactor the firmware rebuild rule
net: wan: wanxl: use $(M68KCC) instead of $(M68KAS) for rebuilding firmware
net: wan: wanxl: use allow to pass CROSS_COMPILE_M68k for rebuilding firmware
kbuild: add comment about grouped target
kbuild: add -Wall to KBUILD_HOSTCXXFLAGS
kconfig: remove unused variable in qconf.cc
sparc: revive __HAVE_ARCH_STRLEN for 32bit sparc
kbuild: refactor Makefile.dtbinst more
kbuild: compute the dtbs_install destination more simply
Makefile: disallow data races on gcc-10 as well
kconfig: make 'imply' obey the direct dependency
kconfig: allow symbols implied by y to become m
net: drop_monitor: use IS_REACHABLE() to guard net_dm_hw_report()
modpost: return error if module is missing ns imports and MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS=n
modpost: rework and consolidate logging interface
kbuild: allow to run dt_binding_check without kernel configuration
... -
Update kselftest help information.
Signed-off-by: Shuah Khan
Signed-off-by: Masahiro Yamada
30 Mar, 2020
1 commit
29 Mar, 2020
4 commits
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The target outputmakefile is used to generate a Makefile
for out-of-tree builds and does not depend on the kernel
configuration.Signed-off-by: David Engraf
Signed-off-by: Masahiro Yamada -
As commit 5ef872636ca7 ("kbuild: get rid of misleading $(AS) from
documents") noted, we rarely use $(AS) directly in the kernel build.Now that the only/last user of $(AS) in drivers/net/wan/Makefile was
converted to $(CC), $(AS) is no longer used in the build process.You can still pass in AS=clang, which is just a switch to turn on
the LLVM integrated assembler.Signed-off-by: Masahiro Yamada
Reviewed-by: Nick Desaulniers
Tested-by: Nick Desaulniers
Reviewed-by: Nathan Chancellor -
GNU Make commit 8c888d95f618 ("[SV 8297] Implement "grouped targets"
for explicit rules.") added the '&:' syntax.I think '&:' is a perfect fit here, but we cannot use it any time
soon. Just add a TODO comment.Signed-off-by: Masahiro Yamada
-
Add -Wall to catch more warnings for C++ host programs.
When I submitted the previous version, the 0-day bot reported
-Wc++11-compat warnings for old GCC:HOSTCXX -fPIC scripts/gcc-plugins/latent_entropy_plugin.o
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/tm.h:28:0,
from scripts/gcc-plugins/gcc-common.h:15,
from scripts/gcc-plugins/latent_entropy_plugin.c:78:
/usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/config/elfos.h:102:21: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
^
/usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/config/elfos.h:170:24: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
^
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/tm.h:42:0,
from scripts/gcc-plugins/gcc-common.h:15,
from scripts/gcc-plugins/latent_entropy_plugin.c:78:
/usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/defaults.h:126:24: warning: C++11 requires a space between string literal and macro [-Wc++11-compat]
fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
^The source of the warnings is in the plugin headers, so we have no
control of it. I just suppressed them by adding -Wno-c++11-compat to
scripts/gcc-plugins/Makefile.Signed-off-by: Masahiro Yamada
Acked-by: Kees Cook
25 Mar, 2020
1 commit
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The 'dtbinst_root' is used to remember the root of the in-kernel dts
directory (i.e. arch/*/boot/dts), but it looks clumsy.I prefer using two variables 'obj' and 'dst' to track the in-kernel
directory and the install destination, respectively.Signed-off-by: Masahiro Yamada
23 Mar, 2020
1 commit
20 Mar, 2020
1 commit
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…/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- fix __uint128_t capability test in Kconfig when GCC that defaults to
32-bit is used to build the 64-bit kernel- suppress new noisy Clang warnings -Wpointer-to-enum-cast
- move the namespace field in Module.symvers for the backward
compatibility reason for the depmod tool- use available compression for initramdisk when INTRAMFS_SOURCE is
defined, which was the original behavior- fix modpost to handle correct large section numbers when it refers to
modversion CRCs and module namespaces- fix comments and documents
* tag 'kbuild-fixes-v5.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
scripts/kallsyms: fix wrong kallsyms_relative_base
modpost: Get proper section index by get_secindex() instead of st_shndx
initramfs: restore default compression behavior
modpost: move the namespace field in Module.symvers last
kbuild: Disable -Wpointer-to-enum-cast
kbuild: doc: fix references to other documents
int128: fix __uint128_t compiler test in Kconfig
kconfig: introduce m32-flag and m64-flag
kbuild: Fix inconsistent comment
19 Mar, 2020
1 commit
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gcc-10 will rename --param=allow-store-data-races=0
to -fno-allow-store-data-races.The flag change happened at https://gcc.gnu.org/PR92046.
Signed-off-by: Sergei Trofimovich
Acked-by: Jiri Kosina
Signed-off-by: Masahiro Yamada
16 Mar, 2020
1 commit
13 Mar, 2020
3 commits
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The dt_binding_check target is located outside of the
'ifneq ($(dtstree),) ... endif' block.So, you can run 'make dt_binding_check' on any architecture.
This makes a perfect sense because the dt-schema is arch-agnostic.The only one problem I see is that scripts/dtc/dtc is not always built.
For example, ARCH=x86 defconfig does not define CONFIG_DTC. Kbuild
descends into scripts/dtc/ with doing nothing. Then, it fails to build
*.example.dt.yaml files.Let's build scripts/dtc/dtc forcibly when running dt_binding_check.
The dt-schema does not depend on any CONFIG option either, so you
should be able to run dt_binding_check without the .config file.Going forward, you can directly run 'make dt_binding_check' in a
pristine source tree.Signed-off-by: Masahiro Yamada
Reviewed-by: Rob Herring -
Since commit 93512dad334d ("dt-bindings: Improve validation build error
handling"), 'make dtbs_check' does not validate the schema fully.If you want to check everything, you need to run two commands separately.
$ make ARCH=arm dt_binding_check
$ make ARCH=arm dtbs_checkThey are exclusive each other, so you cannot do like this:
$ make ARCH=arm dt_binding_check dtbs_check
In this case, dt-doc-validate and dt-extract-example are skipped
because CHECK_DTBS is set.Let's make it possible to run these two targets in a single command.
It will be useful for schema writers.Signed-off-by: Masahiro Yamada
Reviewed-by: Rob Herring -
'make dtbs_check' checks the shecma in addition to building *.dtb files,
in other words, 'make dtbs_check' is a super-set of 'make dtbs'.
So, you do not have to do 'make dtbs dtbs_check', but I want to keep
the build system as robust as possible in any use.Currently, 'dtbs' and 'dtbs_check' are independent of each other.
In parallel building, two threads descend into arch/*/boot/dts/,
one for dtbs and the other for dtbs_check, then end up with building
the same DTB simultaneously.This commit fixes the concurrency issue. Otherwise, I see build errors
like follows:$ make ARCH=arm64 defconfig
$ make -j16 ARCH=arm64 DT_SCHEMA_FILES=Documentation/devicetree/bindings/arm/psci.yaml dtbs dtbs_check
DTC arch/arm64/boot/dts/qcom/sdm845-cheza-r2.dtb
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905x-p212.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
DTC arch/arm64/boot/dts/freescale/imx8mn-evk.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
DTC arch/arm64/boot/dts/zte/zx296718-pcbox.dtb
DTC arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dtb
DTC arch/arm64/boot/dts/xilinx/zynqmp-zc1254-revA.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dtb
DTC arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-inx.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
CHECK arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
fixdep: error opening file: arch/arm64/boot/dts/allwinner/.sun50i-h6-orangepi-lite2.dtb.d: No such file or directory
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb] Error 2
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb'
make[2]: *** Waiting for unfinished jobs....
DTC arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-kd.dtb
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p231.dtb
DTC arch/arm64/boot/dts/xilinx/zynqmp-zc1275-revA.dtb
DTC arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dtb
fixdep: parse error; no targets found
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb] Error 1
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb'
make[1]: *** [scripts/Makefile.build:505: arch/arm64/boot/dts/allwinner] Error 2
make[1]: *** Waiting for unfinished jobs....
DTC arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dtbSigned-off-by: Masahiro Yamada
Reviewed-by: Rob Herring
12 Mar, 2020
1 commit
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The commit 2042b5486bd3 ("kbuild: unset variables in top Makefile
instead of setting 0") renamed the variable from "config-targets"
to "config-build", the comment should be consistent accordingly.Signed-off-by: Kaiden PK Yu (余泊鎧)
Signed-off-by: SZ Lin (林上智)
Signed-off-by: Masahiro Yamada
09 Mar, 2020
1 commit
03 Mar, 2020
2 commits
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When doing a cold build, autoksyms.h starts empty, and is updated late
in the build process to have visibility over the symbols used by in-tree
drivers. But since the symbol whitelist is known upfront, it can be used
to pre-populate autoksyms.h and maximize the amount of code that can be
compiled to its final state in a single pass, hence reducing build time.Do this by using gen_autoksyms.sh to initialize autoksyms.h instead of
creating an empty file.Acked-by: Nicolas Pitre
Tested-by: Matthias Maennich
Reviewed-by: Matthias Maennich
Signed-off-by: Quentin Perret
Signed-off-by: Masahiro Yamada -
Most of the Kconfig commands (except defconfig and all*config) read
the .config file as a base set of CONFIG options.When it does not exist, the files in DEFCONFIG_LIST are searched in
this order and loaded if found.I do not see much sense in the last two lines in DEFCONFIG_LIST.
[1] ARCH_DEFCONFIG
The entry for DEFCONFIG_LIST is guarded by 'depends on !UML'. So, the
ARCH_DEFCONFIG definition in arch/x86/um/Kconfig is meaningless.arch/{sh,sparc,x86}/Kconfig define ARCH_DEFCONFIG depending on 32 or
64 bit variant symbols. This is a little bit strange; ARCH_DEFCONFIG
should be a fixed string because the base config file is loaded before
the symbol evaluation stage.Using KBUILD_DEFCONFIG makes more sense because it is fixed before
Kconfig is invoked. Fortunately, arch/{sh,sparc,x86}/Makefile define it
in the same way, and it works as expected. Hence, replace ARCH_DEFCONFIG
with "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)".[2] arch/$(ARCH)/defconfig
This file path is no longer valid. The defconfig files are always located
in the arch configs/ directories.$ find arch -name defconfig | sort
arch/alpha/configs/defconfig
arch/arm64/configs/defconfig
arch/csky/configs/defconfig
arch/nds32/configs/defconfig
arch/riscv/configs/defconfig
arch/s390/configs/defconfig
arch/unicore32/configs/defconfigThe path arch/*/configs/defconfig is already covered by
"arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)". So, this file path is
not necessary.I moved the default KBUILD_DEFCONFIG to the top Makefile. Otherwise,
the 7 architectures listed above would end up with endless loop of
syncconfig.Signed-off-by: Masahiro Yamada
02 Mar, 2020
2 commits
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This CONFIG option was added by commit 35bb5b1e0e84 ("Add option to
enable -Wframe-larger-than= on gcc 4.4"). At that time, the cc-option
check was needed.According to Documentation/process/changes.rst, the current minimal
supported version of GCC is 4.6, so you can assume GCC supports it.
Clang supports it as well.Remove the cc-option switch and redundant comments.
Signed-off-by: Masahiro Yamada
Reviewed-by: Nathan Chancellor
Reviewed-by: Nick Desaulniers
27 Feb, 2020
3 commits
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The dt_binding_check is added to PHONY, but it is invisible when
$(dtstree) is empty. So, it is not specified as phony for
ARCH=x86 etc.Add it to PHONY outside the ifneq ... endif block.
Signed-off-by: Masahiro Yamada
Acked-by: Rob Herring -
The dtbs_check should be a phony target, but currently it is not
specified so.'make dtbs_check' works even if a file named 'dtbs_check' exists
because it depends on another phony target, scripts_dtc, but we
should not rely on it.Add dtbs_check to PHONY.
Signed-off-by: Masahiro Yamada
Acked-by: Rob Herring -
Complete the comments for valid values of KBUILD_VERBOSE,
specifically for KBUILD_VERBOSE=2.Signed-off-by: Randy Dunlap
Signed-off-by: Masahiro Yamada
24 Feb, 2020
1 commit
17 Feb, 2020
1 commit
10 Feb, 2020
1 commit
06 Feb, 2020
1 commit
-
Currently, the single-target build does not work when two
or more sub-directories are given:$ make fs/ kernel/ lib/
CALL scripts/checksyscalls.sh
CALL scripts/atomic/check-atomics.sh
DESCEND objtool
make[2]: Nothing to be done for 'kernel/'.
make[2]: Nothing to be done for 'fs/'.
make[2]: Nothing to be done for 'lib/'.Make it work properly.
Reported-by: Linus Torvalds
Signed-off-by: Masahiro Yamada
02 Feb, 2020
1 commit
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Pull Kbuild updates from Masahiro Yamada:
- detect missing include guard in UAPI headers
- do not create orphan built-in.a or obj-y objects
- generate modules.builtin more simply, and drop tristate.conf
- simplify built-in initramfs creation
- make linux-headers deb package thinner
- optimize the deb package build script
- misc cleanups
* tag 'kbuild-v5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (34 commits)
builddeb: split libc headers deployment out into a function
builddeb: split kernel headers deployment out into a function
builddeb: remove redundant make for ARCH=um
builddeb: avoid invoking sub-shells where possible
builddeb: remove redundant $objtree/
builddeb: match temporary directory name to the package name
builddeb: remove unneeded files in hdrobjfiles for headers package
kbuild: use -S instead of -E for precise cc-option test in Kconfig
builddeb: allow selection of .deb compressor
kbuild: remove 'Building modules, stage 2.' log
kbuild: remove *.tmp file when filechk fails
kbuild: remove PYTHON2 variable
modpost: assume STT_SPARC_REGISTER is defined
gen_initramfs.sh: remove intermediate cpio_list on errors
initramfs: refactor the initramfs build rules
gen_initramfs.sh: always output cpio even without -o option
initramfs: add default_cpio_list, and delete -d option support
initramfs: generate dependency list and cpio at the same time
initramfs: specify $(src)/gen_initramfs.sh as a prerequisite in Makefile
initramfs: make initramfs compression choice non-optional
...
27 Jan, 2020
1 commit
20 Jan, 2020
1 commit
15 Jan, 2020
1 commit
-
Python 2 has retired. There is no user of this variable.
Signed-off-by: Masahiro Yamada
13 Jan, 2020
1 commit
07 Jan, 2020
1 commit
-
Commit bc081dd6e9f6 ("kbuild: generate modules.builtin") added
infrastructure to generate modules.builtin, the list of all
builtin modules.Basically, it works like this:
- Kconfig generates include/config/tristate.conf, the list of
tristate CONFIG options with a value in a capital letter.- scripts/Makefile.modbuiltin makes Kbuild descend into
directories to collect the information of builtin modules.I am not a big fan of it because Kbuild ends up with traversing
the source tree twice.I am not sure how perfectly it should work, but this approach cannot
avoid false positives; even if the relevant CONFIG option is tristate,
some Makefiles forces obj-m to obj-y.Some examples are:
arch/powerpc/platforms/powermac/Makefile:
obj-$(CONFIG_NVRAM:m=y) += nvram.onet/ipv6/Makefile:
obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.onet/netlabel/Makefile:
obj-$(subst m,y,$(CONFIG_IPV6)) += netlabel_calipso.oNobody has complained about (or noticed) it, so it is probably fine to
have false positives in modules.builtin.This commit simplifies the implementation. Let's exploit the fact
that every module has MODULE_LICENSE(). (modpost shows a warning if
MODULE_LICENSE is missing. If so, 0-day bot would already have blocked
such a module.)I added MODULE_FILE to . When the code is being compiled
as builtin, it will be filled with the file path of the module, and
collected into modules.builtin.info. Then, scripts/link-vmlinux.sh
extracts the list of builtin modules out of it.This new approach fixes the false-positives above, but adds another
type of false-positives; non-modular code may have MODULE_LICENSE()
by mistake. This is not a big deal, it is just the code is always
orphan. We can clean it up if we like. You can see cleanup examples by:$ git log --grep='make.* explicitly non-modular'
To sum up, this commits deletes lots of code, but still produces almost
equivalent results. Please note it does not increase the vmlinux size at
all. As you can see in include/asm-generic/vmlinux.lds.h, the .modinfo
section is discarded in the link stage.Signed-off-by: Masahiro Yamada
06 Jan, 2020
1 commit
30 Dec, 2019
1 commit
23 Dec, 2019
1 commit
22 Dec, 2019
1 commit
-
…asahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- fix warning in out-of-tree 'make clean'
- add READELF variable to the top Makefile
- fix broken builds when LINUX_COMPILE_BY contains a backslash
- fix build warning in kallsyms
- fix NULL pointer access in expr_eq() in Kconfig
- fix missing dependency on rsync in deb-pkg build
- remove ---help--- from documentation
- fix misleading documentation about directory descending
* tag 'kbuild-fixes-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: clarify the difference between obj-y and obj-m w.r.t. descending
kconfig: remove ---help--- from documentation
scripts: package: mkdebian: add missing rsync dependency
kconfig: don't crash on NULL expressions in expr_eq()
scripts/kallsyms: fix offset overflow of kallsyms_relative_base
mkcompile_h: use printf for LINUX_COMPILE_BY
mkcompile_h: git rid of UTS_TRUNCATE from LINUX_COMPILE_{BY,HOST}
x86/boot: kbuild: allow readelf executable to be specified
kbuild: fix 'No such file or directory' warning when cleaning
16 Dec, 2019
1 commit
14 Dec, 2019
1 commit
-
Introduce a new READELF variable to top-level Makefile, so the name of
readelf binary can be specified.Before this change the name of the binary was hardcoded to
"$(CROSS_COMPILE)readelf" which might not be present for every
toolchain.This allows to build with LLVM Object Reader by using make parameter
READELF=llvm-readelf.Link: https://github.com/ClangBuiltLinux/linux/issues/771
Signed-off-by: Dmitry Golovin
Reviewed-by: Nick Desaulniers
Signed-off-by: Masahiro Yamada
