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2021-05-05kbuild: refactor modname-multi by using suffix-searchMasahiro Yamada1-1/+1
Improve the readability slightly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-05-05kbuild: refactor fdtoverlay ruleMasahiro Yamada1-18/+15
Rename overlay-y to multi-dtb-y, which is a consistent name with multi-obj-y. Also, use multi-search to avoid code duplication. Introduce real-dtb-y, which is a consistent name with real-obj-y, to contain primitive blobs compiled from *.dts. This is used to calculate the list of *.dt.yaml files. Set -@ to base DTB without using $(eval ). Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-05-05kbuild: parameterize the .o part of suffix-searchMasahiro Yamada1-8/+11
The suffix-search macro hard-codes the suffix, '.o'. Make it a parameter so that the multi-search and real-search macros can be reused for foo-dtbs syntax introduced by commit 15d16d6dadf6 ("kbuild: Add generic rule to apply fdtoverlay"). Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-05-01kbuild: add comment about why cmd_shipped uses 'cat'Masahiro Yamada1-0/+3
cmd_shipped uses 'cat' instead of 'cp' for copying a file. The reason is explained in the commit [1], but it was in the pre-git era. $ touch a $ chmod -w a $ cp a b $ cp a b cp: cannot create regular file 'b': Permission denied Add comments so that you can see the reason without looking into the history. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=a70dba8086160449cc94c5bdaff78419b6b8e3c8 Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-04-30Merge tag 'kbuild-v5.13' of ↵Linus Torvalds1-8/+8
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - Evaluate $(call cc-option,...) etc. only for build targets - Add CONFIG_VMLINUX_MAP to generate .map file when linking vmlinux - Remove unnecessary --gcc-toolchains Clang flag because the --prefix flag finds the toolchains - Do not pass Clang's --prefix flag when using the integrated as - Check the assembler version in Kconfig time - Add new CONFIG options, AS_VERSION, AS_IS_GNU, AS_IS_LLVM to clean up some dependencies in Kconfig - Fix invalid Module.symvers creation when building only modules without vmlinux - Fix false-positive modpost warnings when CONFIG_TRIM_UNUSED_KSYMS is set, but there is no module to build - Refactor module installation Makefile - Support zstd for module compression - Convert alpha and ia64 to use generic shell scripts to generate the syscall headers - Add a new elfnote to indicate if the kernel was built with LTO, which will be used by pahole - Flatten the directory structure under include/config/ so CONFIG options and filenames match - Change the deb source package name from linux-$(KERNELRELEASE) to linux-upstream * tag 'kbuild-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (42 commits) kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test kbuild: deb-pkg: change the source package name to linux-upstream tools: do not include scripts/Kbuild.include kbuild: redo fake deps at include/config/*.h kbuild: remove TMPO from try-run MAINTAINERS: add pattern for dummy-tools kbuild: add an elfnote for whether vmlinux is built with lto ia64: syscalls: switch to generic syscallhdr.sh ia64: syscalls: switch to generic syscalltbl.sh alpha: syscalls: switch to generic syscallhdr.sh alpha: syscalls: switch to generic syscalltbl.sh sysctl: use min() helper for namecmp() kbuild: add support for zstd compressed modules kbuild: remove CONFIG_MODULE_COMPRESS kbuild: merge scripts/Makefile.modsign to scripts/Makefile.modinst kbuild: move module strip/compression code into scripts/Makefile.modinst kbuild: refactor scripts/Makefile.modinst kbuild: rename extmod-prefix to extmod_prefix kbuild: check module name conflict for external modules as well kbuild: show the target directory for depmod log ...
2021-04-29Merge tag 'devicetree-for-5.13' of ↵Linus Torvalds1-6/+28
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux Pull devicetree updates from Rob Herring: - Refactor powerpc and arm64 kexec DT handling to common code. This enables IMA on arm64. - Add kbuild support for applying DT overlays at build time. The first user are the DT unittests. - Fix kerneldoc formatting and W=1 warnings in drivers/of/ - Fix handling 64-bit flag on PCI resources - Bump dtschema version required to v2021.2.1 - Enable undocumented compatible checks for dtbs_check. This allows tracking of missing binding schemas. - DT docs improvements. Regroup the DT docs and add the example schema and DT kernel ABI docs to the doc build. - Convert Broadcom Bluetooth and video-mux bindings to schema - Add QCom sm8250 Venus video codec binding schema - Add vendor prefixes for AESOP, YIC System Co., Ltd, and Siliconfile Technologies Inc. - Cleanup of DT schema type references on common properties and standard unit properties * tag 'devicetree-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (64 commits) powerpc: If kexec_build_elf_info() fails return immediately from elf64_load() powerpc: Free fdt on error in elf64_load() of: overlay: Fix kerneldoc warning in of_overlay_remove() of: linux/of.h: fix kernel-doc warnings of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses dt-bindings: bcm4329-fmac: add optional brcm,ccode-map docs: dt: update writing-schema.rst references dt-bindings: media: venus: Add sm8250 dt schema of: base: Fix spelling issue with function param 'prop' docs: dt: Add DT API documentation of: Add missing 'Return' section in kerneldoc comments of: Fix kerneldoc output formatting docs: dt: Group DT docs into relevant sub-sections docs: dt: Make 'Devicetree' wording more consistent docs: dt: writing-schema: Include the example schema in the doc build docs: dt: writing-schema: Remove spurious indentation dt-bindings: Fix reference in submitting-patches.rst to the DT ABI doc dt-bindings: ddr: Add optional manufacturer and revision ID to LPDDR3 dt-bindings: media: video-interfaces: Drop the example devicetree: bindings: clock: Minor typo fix in the file armada3700-tbg-clock.txt ...
2021-04-24kbuild: move $(strip ) to suffix-search definitionMasahiro Yamada1-3/+3
Move $(strip ...) to the callee from the callers of suffix-search. It shortens the code slightly. Adding a space after a comma will not be a matter. I also dropped parentheses from single character variables. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-04-24kbuild: rename multi-used-* to multi-obj-*Masahiro Yamada1-5/+5
I think multi-obj-* is clearer, and more consistent with real-obj-*. Rename as follows: multi-used-y -> multi-obj-y multi-used-m -> multi-obj-m multi-used -> multi-obj-ym Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-03-24kbuild: Add generic rule to apply fdtoverlayRob Herring1-2/+24
Add a generic rule to apply fdtoverlay in Makefile.lib, so every platform doesn't need to carry the complex rule. This also automatically adds "DTC_FLAGS_foo_base += -@" for all base files. The platform's Makefile only needs to have this now: foo-dtbs := foo_base.dtb foo_overlay1.dtbo foo_overlay2.dtbo dtb-y := foo.dtb We don't want to run schema checks on foo.dtb (as foo.dts doesn't exist) and the Makefile is updated accordingly. Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org> Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Frank Rowand <frank.rowand@sony.com> Tested-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20920b0df6b067aca4040459a9677d7d1d6d766a.1615354376.git.viresh.kumar@linaro.org
2021-03-24kbuild: Simplify builds with CONFIG_OF_ALL_DTBSViresh Kumar1-3/+2
We update 'always-y' based on CONFIG_OF_ALL_DTBS three times. It would be far more straight forward if we rather update dtb-y to include all .dtb files if CONFIG_OF_ALL_DTBS is enabled. Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Frank Rowand <frank.rowand@sony.com> Tested-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/7fe7e5ef6ed75450ddf6c224b8adb53059e504e2.1615354376.git.viresh.kumar@linaro.org
2021-03-16kbuild: Enable DT undocumented compatible checksRob Herring1-1/+2
dt-validate has an option to warn on any compatible strings which don't match any schema. The option has recently been improved to fix false positives, so let's enable the option. This is useful for tracking compatibles which are undocumented or not yet converted to DT schema. Previously, the only check of undocumented compatible strings has been an imperfect checkpatch.pl check. The option is enabled by default for 'dtbs_check'. This will add more warnings, but some platforms are down to only a handful of these warnings (good job!). There's about 100 cases in the binding examples, so the option is disabled until these are fixed. In the meantime, they can be checked with: make DT_CHECKER_FLAGS=-m dt_binding_check Cc: Maxime Ripard <mripard@kernel.org> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Michal Marek <michal.lkml@markovi.net> Cc: linux-kbuild@vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20210311233640.1581526-2-robh@kernel.org
2021-03-11kbuild: remove meaningless parameter to $(call if_changed_rule,dtc)Masahiro Yamada1-1/+1
This is a remnant of commit 78046fabe6e7 ("kbuild: determine the output format of DTC by the target suffix"). The parameter "yaml" is meaningless because cmd_dtc no loner takes $(2). Reported-by: Rob Herring <robh@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-03-11kbuild: remove unneeded -O option to dtcMasahiro Yamada1-1/+1
This piece of code converts the target suffix to the dtc -O option: *.dtb -> -O dtb *.dt.yaml -> -O yaml Commit ce88c9c79455 ("kbuild: Add support to build overlays (%.dtbo)") added the third case: *.dtbo -> -O dtbo This works thanks to commit 163f0469bf2e ("dtc: Allow overlays to have .dtbo extension") in the upstream DTC, which has already been pulled in the kernel. However, I think it is a bit odd because "dtbo" is not a format name. At least, it does not show up in the help message of dtc. $ scripts/dtc/dtc --help [ snip ] -O, --out-format <arg> Output formats are: dts - device tree source text dtb - device tree blob yaml - device tree encoded as YAML asm - assembler source So, I am not a big fan of the second hunk of that change: } else if (streq(outform, "dtbo")) { dt_to_blob(outf, dti, outversion); Anyway, we did not need to do this in Makefile in the first place. guess_type_by_name() had already understood ".yaml" before commit 4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks"), and now does ".dtbo" as well. Makefile does not need to duplicate the same logic. Let's leave it to dtc. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Rob Herring <robh@kernel.org>
2021-02-25Merge tag 'kbuild-v5.12' of ↵Linus Torvalds1-23/+15
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - Fix false-positive build warnings for ARCH=ia64 builds - Optimize dictionary size for module compression with xz - Check the compiler and linker versions in Kconfig - Fix misuse of extra-y - Support DWARF v5 debug info - Clamp SUBLEVEL to 255 because stable releases 4.4.x and 4.9.x exceeded the limit - Add generic syscall{tbl,hdr}.sh for cleanups across arches - Minor cleanups of genksyms - Minor cleanups of Kconfig * tag 'kbuild-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (38 commits) initramfs: Remove redundant dependency of RD_ZSTD on BLK_DEV_INITRD kbuild: remove deprecated 'always' and 'hostprogs-y/m' kbuild: parse C= and M= before changing the working directory kbuild: reuse this-makefile to define abs_srctree kconfig: unify rule of config, menuconfig, nconfig, gconfig, xconfig kconfig: omit --oldaskconfig option for 'make config' kconfig: fix 'invalid option' for help option kconfig: remove dead code in conf_askvalue() kconfig: clean up nested if-conditionals in check_conf() kconfig: Remove duplicate call to sym_get_string_value() Makefile: Remove # characters from compiler string Makefile: reuse CC_VERSION_TEXT kbuild: check the minimum linker version in Kconfig kbuild: remove ld-version macro scripts: add generic syscallhdr.sh scripts: add generic syscalltbl.sh arch: syscalls: remove $(srctree)/ prefix from syscall tables arch: syscalls: add missing FORCE and fix 'targets' to make if_changed work gen_compile_commands: prune some directories kbuild: simplify access to the kernel's version ...
2021-02-24kbuild: remove deprecated 'always' and 'hostprogs-y/m'Masahiro Yamada1-12/+0
These have no more user in the upstream code. The use of them has been warned for a while for external modules. The migration is finished. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-02-24Merge tag 'clang-lto-v5.12-rc1-part2' of ↵Linus Torvalds1-0/+12
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull more clang LTO updates from Kees Cook: "Clang LTO x86 enablement. Full disclosure: while this has _not_ been in linux-next (since it initially looked like the objtool dependencies weren't going to make v5.12), it has been under daily build and runtime testing by Sami for quite some time. These x86 portions have been discussed on lkml, with Peter, Josh, and others helping nail things down. The bulk of the changes are to get objtool working happily. The rest of the x86 enablement is very small. Summary: - Generate __mcount_loc in objtool (Peter Zijlstra) - Support running objtool against vmlinux.o (Sami Tolvanen) - Clang LTO enablement for x86 (Sami Tolvanen)" Link: https://lore.kernel.org/lkml/20201013003203.4168817-26-samitolvanen@google.com/ Link: https://lore.kernel.org/lkml/cover.1611263461.git.jpoimboe@redhat.com/ * tag 'clang-lto-v5.12-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: kbuild: lto: force rebuilds when switching CONFIG_LTO x86, build: allow LTO to be selected x86, cpu: disable LTO for cpu.c x86, vdso: disable LTO only for vDSO kbuild: lto: postpone objtool objtool: Split noinstr validation from --vmlinux x86, build: use objtool mcount tracing: add support for objtool mcount objtool: Don't autodetect vmlinux.o objtool: Fix __mcount_loc generation with Clang's assembler objtool: Add a pass for generating __mcount_loc
2021-02-23kbuild: lto: postpone objtoolSami Tolvanen1-0/+12
With LTO, LLVM bitcode won't be compiled into native code until modpost_link, or modfinal for modules. This change postpones calls to objtool until after these steps, and moves objtool_args to Makefile.lib, so the arguments can be reused in Makefile.modfinal. As we didn't have objects to process earlier, we use --duplicate when processing vmlinux.o. This change also disables unreachable instruction warnings with LTO to avoid warnings about the int3 padding between functions. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org>
2021-02-23Merge tag 'clang-lto-v5.12-rc1' of ↵Linus Torvalds1-2/+4
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull clang LTO updates from Kees Cook: "Clang Link Time Optimization. This is built on the work done preparing for LTO by arm64 folks, tracing folks, etc. This includes the core changes as well as the remaining pieces for arm64 (LTO has been the default build method on Android for about 3 years now, as it is the prerequisite for the Control Flow Integrity protections). While x86 LTO enablement is done, it depends on some pending objtool clean-ups. It's possible that I'll send a "part 2" pull request for LTO that includes x86 support. For merge log posterity, and as detailed in commit dc5723b02e52 ("kbuild: add support for Clang LTO"), here is the lt;dr to do an LTO build: make LLVM=1 LLVM_IAS=1 defconfig scripts/config -e LTO_CLANG_THIN make LLVM=1 LLVM_IAS=1 (To do a cross-compile of arm64, add "CROSS_COMPILE=aarch64-linux-gnu-" and "ARCH=arm64" to the "make" command lines.) Summary: - Clang LTO build infrastructure and arm64-specific enablement (Sami Tolvanen) - Recursive build CC_FLAGS_LTO fix (Alexander Lobakin)" * tag 'clang-lto-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: kbuild: prevent CC_FLAGS_LTO self-bloating on recursive rebuilds arm64: allow LTO to be selected arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS arm64: vdso: disable LTO drivers/misc/lkdtm: disable LTO for rodata.o efi/libstub: disable LTO scripts/mod: disable LTO for empty.c modpost: lto: strip .lto from module names PCI: Fix PREL32 relocations for LTO init: lto: fix PREL32 relocations init: lto: ensure initcall ordering kbuild: lto: add a default list of used symbols kbuild: lto: merge module sections kbuild: lto: limit inlining kbuild: lto: fix module versioning kbuild: add support for Clang LTO tracing: move function tracer options to Kconfig
2021-02-16Kbuild: Make composite object searching more genericElliot Berman1-4/+8
Reduce repeated logic around expanding composite objects. Signed-off-by: Elliot Berman <eberman@codeaurora.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-02-16kbuild: use always-y instead of extra-yMasahiro Yamada1-5/+5
As commit d0e628cd817f ("kbuild: doc: clarify the difference between extra-y and always-y") explained, extra-y should be used for listing the prerequisites of vmlinux. These targets are not related to vmlinux. always-y is a better fix. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Rob Herring <robh@kernel.org>
2021-02-04kbuild: Add support to build overlays (%.dtbo)Viresh Kumar1-0/+5
Add support for building DT overlays (%.dtbo). The overlay's source file will have the usual extension, i.e. .dts, though the blob will have .dtbo extension to distinguish it from normal blobs. Acked-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/434ba2467dd0cd011565625aeb3450650afe0aae.1611904394.git.viresh.kumar@linaro.org
2021-01-14init: lto: ensure initcall orderingSami Tolvanen1-2/+4
With LTO, the compiler doesn't necessarily obey the link order for initcalls, and initcall variables need globally unique names to avoid collisions at link time. This change exports __KBUILD_MODNAME and adds the initcall_id() macro, which uses it together with __COUNTER__ and __LINE__ to help ensure these variables have unique names, and moves each variable to its own section when LTO is enabled, so the correct order can be specified using a linker script. The generate_initcall_ordering.pl script uses nm to find initcalls from the object files passed to the linker, and generates a linker script that specifies the same order for initcalls that we would have without LTO. With LTO enabled, the script is called in link-vmlinux.sh through jobserver-exec to limit the number of jobs spawned. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20201211184633.3213045-8-samitolvanen@google.com
2020-12-22kasan, arm64: expand CONFIG_KASAN checksAndrey Konovalov1-0/+2
Some #ifdef CONFIG_KASAN checks are only relevant for software KASAN modes (either related to shadow memory or compiler instrumentation). Expand those into CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS. Link: https://lkml.kernel.org/r/e6971e432dbd72bb897ff14134ebb7e169bdcf0c.1606161801.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Marco Elver <elver@google.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-08-19dt-bindings: Use json for processed-schema*Andrei Ziureaev1-1/+1
Change the format of processed-schema* from yaml to json to speed up validation. With json output, using xargs and appending the output won't work since json has explicit list begin and end characters. Instead, we pass the schema files as a list in a temp file. The parsing time for the processed schema goes down from ~2sec to 70ms. Also, 'make dtbs_check' becomes 33% faster. Some error messages are affected by this change. For example, "True was expected" becomes "... is not of type 'boolean'". The order of messages is also changed. Signed-off-by: Andrei Ziureaev <andrei.ziureaev@arm.com> Signed-off-by: Rob Herring <robh@kernel.org>
2020-08-10Merge tag 'kbuild-v5.9' of ↵Linus Torvalds1-8/+20
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild updates from Masahiro Yamada: - run the checker (e.g. sparse) after the compiler - remove unneeded cc-option tests for old compiler flags - fix tar-pkg to install dtbs - introduce ccflags-remove-y and asflags-remove-y syntax - allow to trace functions in sub-directories of lib/ - introduce hostprogs-always-y and userprogs-always-y syntax - various Makefile cleanups * tag 'kbuild-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kbuild: stop filtering out $(GCC_PLUGINS_CFLAGS) from cc-option base kbuild: include scripts/Makefile.* only when relevant CONFIG is enabled kbuild: introduce hostprogs-always-y and userprogs-always-y kbuild: sort hostprogs before passing it to ifneq kbuild: move host .so build rules to scripts/gcc-plugins/Makefile kbuild: Replace HTTP links with HTTPS ones kbuild: trace functions in subdirectories of lib/ kbuild: introduce ccflags-remove-y and asflags-remove-y kbuild: do not export LDFLAGS_vmlinux kbuild: always create directories of targets powerpc/boot: add DTB to 'targets' kbuild: buildtar: add dtbs support kbuild: remove cc-option test of -ffreestanding kbuild: remove cc-option test of -fno-stack-protector Revert "kbuild: Create directory for target DTB" kbuild: run the checker after the compiler
2020-08-09kbuild: introduce hostprogs-always-y and userprogs-always-yMasahiro Yamada1-0/+11
To build host programs, you need to add the program names to 'hostprogs' to use the necessary build rule, but it is not enough to build them because there is no dependency. There are two types of host programs: built as the prerequisite of another (e.g. gen_crc32table in lib/Makefile), or always built when Kbuild visits the Makefile (e.g. genksyms in scripts/genksyms/Makefile). The latter is typical in Makefiles under scripts/, which contains host programs globally used during the kernel build. To build them, you need to add them to both 'hostprogs' and 'always-y'. This commit adds hostprogs-always-y as a shorthand. The same applies to user programs. net/bpfilter/Makefile builds bpfilter_umh on demand, hence always-y is unneeded. In contrast, programs under samples/ are added to both 'userprogs' and 'always-y' so they are always built when Kbuild visits the Makefiles. userprogs-always-y works as a shorthand. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
2020-08-09kbuild: introduce ccflags-remove-y and asflags-remove-yMasahiro Yamada1-6/+8
CFLAGS_REMOVE_<file>.o filters out flags when compiling a particular object, but there is no convenient way to do that for every object in a directory. Add ccflags-remove-y and asflags-remove-y to make it easily. Use ccflags-remove-y to clean up some Makefiles. The add/remove order works as follows: [1] KBUILD_CFLAGS specifies compiler flags used globally [2] ccflags-y adds compiler flags for all objects in the current Makefile [3] ccflags-remove-y removes compiler flags for all objects in the current Makefile (New feature) [4] CFLAGS_<file> adds compiler flags per file. [5] CFLAGS_REMOVE_<file> removes compiler flags per file. Having [3] before [4] allows us to remove flags from most (but not all) objects in the current Makefile. For example, kernel/trace/Makefile removes $(CC_FLAGS_FTRACE) from all objects in the directory, then adds it back to trace_selftest_dynamic.o and CFLAGS_trace_kprobe_selftest.o The same applies to lib/livepatch/Makefile. Please note ccflags-remove-y has no effect to the sub-directories. In contrast, the previous notation got rid of compiler flags also from all the sub-directories. The following are not affected because they have no sub-directories: arch/arm/boot/compressed/ arch/powerpc/xmon/ arch/sh/ kernel/trace/ However, lib/ has several sub-directories. To keep the behavior, I added ccflags-remove-y to all Makefiles in subdirectories of lib/, except the following: lib/vdso/Makefile - Kbuild does not descend into this Makefile lib/raid/test/Makefile - This is not used for the kernel build I think commit 2464a609ded0 ("ftrace: do not trace library functions") excluded too much. In the next commit, I will remove ccflags-remove-y from the sub-directories of lib/. Suggested-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Brendan Higgins <brendanhiggins@google.com> (KUnit) Tested-by: Anders Roxell <anders.roxell@linaro.org>
2020-07-31init: Add support for zstd compressed kernelNick Terrell1-0/+22
- Add the zstd and zstd22 cmds to scripts/Makefile.lib - Add the HAVE_KERNEL_ZSTD and KERNEL_ZSTD options Architecture specific support is still needed for decompression. Signed-off-by: Nick Terrell <terrelln@fb.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200730190841.2071656-4-nickrterrell@gmail.com
2020-07-07Revert "kbuild: Create directory for target DTB"Masahiro Yamada1-2/+1
This reverts commit 77479b38e2f58890eb221a0418357502a5b41cd6. Since commit 8a78756eb545 ("kbuild: create object directories simpler and faster"), all directories for 'targets' are created. 'mkdir -p $(dir ${dtc-tmp})' is no longer needed. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-30dt-bindings: copy process-schema-examples.yaml to process-schema.yamlMasahiro Yamada1-0/+3
There are two processed schema files: - processed-schema-examples.yaml Used for 'make dt_binding_check'. This is always a full schema. - processed-schema.yaml Used for 'make dtbs_check'. This may be a full schema, or a smaller subset if DT_SCHEMA_FILES is given by a user. If DT_SCHEMA_FILES is not specified, they are the same. You can copy the former to the latter instead of running dt-mk-schema twice. This saves the cpu time a lot when you do 'make dt_binding_check dtbs_check' because building the full schema takes a couple of seconds. If DT_SCHEMA_FILES is specified, processed-schema.yaml is generated based on the specified yaml files. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://lore.kernel.org/r/20200625170434.635114-4-masahiroy@kernel.org Signed-off-by: Rob Herring <robh@kernel.org>
2020-06-30scripts/dtc: Update to upstream version v1.6.0-11-g9d7888cbf19cRob Herring1-1/+3
Sync with upstream dtc primarily to pickup the I2C bus check fixes. The interrupt_provider check is noisy, so turn it off for now. This adds the following commits from upstream: 9d7888cbf19c dtc: Consider one-character strings as strings 8259d59f59de checks: Improve i2c reg property checking fdabcf2980a4 checks: Remove warning for I2C_OWN_SLAVE_ADDRESS 2478b1652c8d libfdt: add extern "C" for C++ f68bfc2668b2 libfdt: trivial typo fix 7be250b4d059 libfdt: Correct condition for reordering blocks 81e0919a3e21 checks: Add interrupt provider test 85e5d839847a Makefile: when building libfdt only, do not add unneeded deps b28464a550c5 Fix some potential unaligned accesses in dtc Signed-off-by: Rob Herring <robh@kernel.org>
2020-06-13Merge tag 'kbuild-v5.8-2' of ↵Linus Torvalds1-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull more Kbuild updates from Masahiro Yamada: - fix build rules in binderfs sample - fix build errors when Kbuild recurses to the top Makefile - covert '---help---' in Kconfig to 'help' * tag 'kbuild-v5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: treewide: replace '---help---' in Kconfig files with 'help' kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables samples: binderfs: really compile this sample and fix build issues
2020-06-11Rebase locking/kcsan to locking/urgentThomas Gleixner1-0/+10
Merge the state of the locking kcsan branch before the read/write_once() and the atomics modifications got merged. Squash the fallout of the rebase on top of the read/write once and atomic fallback work into the merge. The history of the original branch is preserved in tag locking-kcsan-2020-06-02. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2020-06-11kbuild: fix broken builds because of GZIP,BZIP2,LZOP variablesDenis Efremov1-3/+3
Redefine GZIP, BZIP2, LZOP variables as KGZIP, KBZIP2, KLZOP resp. GZIP, BZIP2, LZOP env variables are reserved by the tools. The original attempt to redefine them internally doesn't work in makefiles/scripts intercall scenarios, e.g., "make GZIP=gzip bindeb-pkg" and results in broken builds. There can be other broken build commands because of this, so the universal solution is to use non-reserved env variables for the compression tools. Fixes: 8dfb61dcbace ("kbuild: add variables for compression tools") Signed-off-by: Denis Efremov <efremov@linux.com> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-06kbuild: add variables for compression toolsDenis Efremov1-6/+6
Allow user to use alternative implementations of compression tools, such as pigz, pbzip2, pxz. For example, multi-threaded tools to speed up the build: $ make GZIP=pigz BZIP2=pbzip2 Variables _GZIP, _BZIP2, _LZOP are used internally because original env vars are reserved by the tools. The use of GZIP in gzip tool is obsolete since 2015. However, alternative implementations (e.g., pigz) still rely on it. BZIP2, BZIP, LZOP vars are not obsolescent. The credit goes to @grsecurity. As a sidenote, for multi-threaded lzma, xz compression one can use: $ export XZ_OPT="--threads=0" Signed-off-by: Denis Efremov <efremov@linux.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-03kbuild: update modules.order only when contained modules are updatedMasahiro Yamada1-13/+14
Make modules.order depend on $(obj-m), and use if_changed to build it. This will avoid unneeded update of modules.order, which will be useful to optimize the modpost stage. Currently, the second pass of modpost is always invoked. By checking the timestamp of modules.order, we can avoid the unneeded modpost. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-06-01kbuild: refactor subdir-ym calculationMasahiro Yamada1-9/+4
Remove the unneeded variables, __subdir-y and __subdir-m. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-25kbuild: make modules.order rule consistent with built-in.aMasahiro Yamada1-0/+2
built-in.a contains the built-in object paths from the current and sub directories. module.order collects the module paths from the current and sub directories. Make their build rules look more symmetrical. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-25kbuild: move subdir-obj-y to scripts/Makefile.buildMasahiro Yamada1-5/+0
Save $(addprefix ...) for subdir-obj-y. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-17kbuild: warn if always, hostprogs-y, or hostprogs-m is usedMasahiro Yamada1-1/+11
always, hostprogs-y, and hostprogs-m are deprecated. There is no user in upstream code, but I will keep them for external modules. I want to remove them entirely someday. Prompt downstream users for the migration. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-12kbuild: determine the output format of DTC by the target suffixMasahiro Yamada1-3/+3
cmd_dtc takes the additional parameter $(2) to select the target format, dtb or yaml. This makes things complicated when it is used with cmd_and_fixdep and if_changed_rule. I actually stumbled on this. See commit 3d4b2238684a ("kbuild: fix DT binding schema rule again to avoid needless rebuilds"). Extract the suffix part of the target instead of passing the parameter. Fortunately, this works for both $(obj)/%.dtb and $(obj)/%.dt.yaml . Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-05-12kbuild: use -MMD instead of -MD to exclude system headers from dependencyMasahiro Yamada1-4/+4
This omits system headers from the generated header dependency. System headers are not updated unless you upgrade the compiler. Nor do they contain CONFIG options, so fixdep does not need to parse them. Having said that, the effect of this optimization will be quite small because the kernel code generally does not include system headers except <stdarg.h>. Host programs include a lot of system headers, but there are not so many in the kernel tree. At first, keeping system headers in .*.cmd files might be useful to detect the compiler update, but there is no guarantee that <stdarg.h> is included from every file. So, I implemented a more reliable way in the previous commit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-04-23kbuild: fix DT binding schema rule again to avoid needless rebuildsMasahiro Yamada1-1/+1
Since commit 7a0496056064 ("kbuild: fix DT binding schema rule to detect command line changes"), this rule is every time re-run even if you change nothing. cmd_dtc takes one additional parameter to pass to the -O option of dtc. We need to pass 'yaml' to if_changed_rule. Otherwise, cmd-check invoked from if_changed_rule is false positive. Fixes: 7a0496056064 ("kbuild: fix DT binding schema rule to detect command line changes") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-04-13Merge tag 'v5.7-rc1' into locking/kcsan, to resolve conflicts and refreshIngo Molnar1-1/+2
Resolve these conflicts: arch/x86/Kconfig arch/x86/kernel/Makefile Do a minor "evil merge" to move the KCSAN entry up a bit by a few lines in the Kconfig to reduce the probability of future conflicts. Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-03-21Merge branch 'linus' into locking/kcsan, to pick up fixesIngo Molnar1-3/+3
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-03-21Merge branch 'x86/kdump' into locking/kcsan, to resolve conflictsIngo Molnar1-8/+19
Conflicts: arch/x86/purgatory/Makefile Signed-off-by: Ingo Molnar <mingo@kernel.org>
2020-03-03kbuild: Always validate DT binding examplesRob Herring1-1/+2
Most folks only run dt_binding_check on the single schema they care about by setting DT_SCHEMA_FILES. That means example is only checked against that one schema which is not always sufficient. Let's address this by splitting processed-schema.yaml into 2 files: one that's always all schemas for the examples and one that's just the schema in DT_SCHEMA_FILES for dtbs. Co-developed-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2020-02-26kbuild: remove unneeded semicolon at the end of cmd_dtb_checkMasahiro Yamada1-1/+1
This trailing semicolon is unneeded. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Rob Herring <robh@kernel.org>
2020-02-26kbuild: fix DT binding schema rule to detect command line changesMasahiro Yamada1-2/+2
This if_change_rule is not working properly; it cannot detect any command line change. The reason is because cmd-check in scripts/Kbuild.include compares $(cmd_$@) and $(cmd_$1), but cmd_dtc_dt_yaml does not exist here. For if_change_rule to work properly, the stem part of cmd_* and rule_* must match. Because this cmd_and_fixdep invokes cmd_dtc, this rule must be named rule_dtc. Fixes: 4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Rob Herring <robh@kernel.org>
2020-02-03kbuild: rename hostprogs-y/always to hostprogs/always-yMasahiro Yamada1-1/+5
In old days, the "host-progs" syntax was used for specifying host programs. It was renamed to the current "hostprogs-y" in 2004. It is typically useful in scripts/Makefile because it allows Kbuild to selectively compile host programs based on the kernel configuration. This commit renames like follows: always -> always-y hostprogs-y -> hostprogs So, scripts/Makefile will look like this: always-$(CONFIG_BUILD_BIN2C) += ... always-$(CONFIG_KALLSYMS) += ... ... hostprogs := $(always-y) $(always-m) I think this makes more sense because a host program is always a host program, irrespective of the kernel configuration. We want to specify which ones to compile by CONFIG options, so always-y will be handier. The "always", "hostprogs-y", "hostprogs-m" will be kept for backward compatibility for a while. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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