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Weißschuh If the cpio command is not available the error emitted by gen_kheaders.so is not clear as all output of the call to cpio is discarded: GNU make 4.4: GEN kernel/kheaders_data.tar.xz find: 'standard output': Broken pipe find: write error make[2]: *** [kernel/Makefile:157: kernel/kheaders_data.tar.xz] Error 127 make[1]: *** [scripts/Makefile.build:504: kernel] Error 2 GNU make < 4.4: GEN kernel/kheaders_data.tar.xz make[2]: *** [kernel/Makefile:157: kernel/kheaders_data.tar.xz] Error 127 make[2]: *** Waiting for unfinished jobs.... make[1]: *** [scripts/Makefile.build:504: kernel] Error 2 Add an explicit check that will trigger a clear message about the issue: CHK kernel/kheaders_data.tar.xz ./kernel/gen_kheaders.sh: line 17: type: cpio: not found The other commands executed by gen_kheaders.sh are part of a standard installation, so they are not checked. Reported-by: Amy Parker <apark0006@student.cerritos.edu> Link: https://lore.kernel.org/lkml/CAPOgqxFva=tOuh1UitCSN38+28q3BNXKq19rEsVNPRzRqKqZ+g@mail.gmail.com/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Reviewed-by: Nicolas Schier <n.schier@avm.de> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2022-09-29kbuild: build init/built-in.a just onceMasahiro Yamada Kbuild builds init/built-in.a twice; first during the ordinary directory descending, second from scripts/link-vmlinux.sh. We do this because UTS_VERSION contains the build version and the timestamp. We cannot update it during the normal directory traversal since we do not yet know if we need to update vmlinux. UTS_VERSION is temporarily calculated, but omitted from the update check. Otherwise, vmlinux would be rebuilt every time. When Kbuild results in running link-vmlinux.sh, it increments the version number in the .version file and takes the timestamp at that time to really fix UTS_VERSION. However, updating the same file twice is a footgun. To avoid nasty timestamp issues, all build artifacts that depend on init/built-in.a are atomically generated in link-vmlinux.sh, where some of them do not need rebuilding. To fix this issue, this commit changes as follows: [1] Split UTS_VERSION out to include/generated/utsversion.h from include/generated/compile.h include/generated/utsversion.h is generated just before the vmlinux link. It is generated under include/generated/ because some decompressors (s390, x86) use UTS_VERSION. [2] Split init_uts_ns and linux_banner out to init/version-timestamp.c from init/version.c init_uts_ns and linux_banner contain UTS_VERSION. During the ordinary directory descending, they are compiled with __weak and used to determine if vmlinux needs relinking. Just before the vmlinux link, they are compiled without __weak to embed the real version and timestamp. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2022-05-08kheaders: Have cpio unconditionally replace filesDaniel Mentz For out-of-tree builds, this script invokes cpio twice to copy header files from the srctree and subsequently from the objtree. According to a comment in the script, there might be situations in which certain files already exist in the destination directory when header files are copied from the objtree: "The second CPIO can complain if files already exist which can happen with out of tree builds having stale headers in srctree. Just silence CPIO for now." GNU cpio might simply print a warning like "newer or same age version exists", but toybox cpio exits with a non-zero exit code unless the command line option "-u" is specified. To improve compatibility with toybox cpio, add the command line option "-u" to unconditionally replace existing files in the destination directory. Signed-off-by: Daniel Mentz <danielmentz@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2021-05-27kbuild: clean up ${quiet} checks in shell scriptsMasahiro Yamada There were efforts to make 'make -s' really silent when it is a warning-free build. The conventional way was to let a shell script check ${quiet}, and if it is 'silent_', suppress the stdout by itself. With the previous commit, the 'cmd' takes care of it now. The 'cmd' is also invoked from if_changed, if_changed_dep, and if_changed_rule. You can omit ${quiet} checks in shell scripts when they are invoked from the 'cmd' macro. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2021-04-25kbuild: redo fake deps at include/config/*.hAlexey Dobriyan Make include/config/foo/bar.h fake deps files generation simpler. * delete .h suffix those aren't header files, shorten filenames, * delete tolower() Linux filesystems can deal with both upper and lowercase filenames very well, * put everything in 1 directory Presumably 'mkdir -p' split is from dark times when filesystems handled huge directories badly, disks were round adding to seek times. x86_64 allmodconfig lists 12364 files in include/config. ../obj/include/config/ ├── 104_QUAD_8 ├── 60XX_WDT ├── 64BIT ... ├── ZSWAP_DEFAULT_ON ├── ZSWAP_ZPOOL_DEFAULT └── ZSWAP_ZPOOL_DEFAULT_ZBUD 0 directories, 12364 files Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> 2020-06-06kbuild: add variables for compression toolsDenis Efremov 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>