Changes in Makefile

bb29b957eaaa15be33243550d9ee576c2d601669 - Merge tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

Wed, 21 Oct 2026 22:45:44 +0200

Merge tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linuxPull Kbuild / Kconfig updates from Nathan Chancellor: "Kbuild: - Suppress compiler flags in debug info for external module builds - Use '-fmacro-prefix-map' in more places in the build - Merge initial set of changes from Lorenzo's speed up series, along with some fixes found through testing: - Avoid allocating .modinfo in vmlinux - Speed up kallsyms by indexing symbols by token and outputting binary data to disk directly then including in assembly via .incbin - Don't sort $(NM) output when unnecessary - Only emit relocations on the final vmlinx link - Reimplement mksysmap in C - Move many cc-option and ld-option calls into the Kconfig stage to cache their results - Use pigz for gzip compression when available - Move gen_init_cpio and gen_initramfs.sh from usr/ to scripts/ - Add a TOML configuration to scripts/container and update documentation accordingly - Add a generic, opt-in mechanism for checking that headers can compile standalone - Update machine function splitting argument for LLVM 24 rename in AutoFDO build - Miscellaneous minor clean ups, fixes, and hardening, mostly found/fixed via LLMs Kconfig: - Turn recursive ranges into an error - Fix savedefconfig for defaults that were adjusted for being out of range and revert a previously applied workaround - Improvements and hardening around integer and hexadecimal values - Emit a warning when selecting or implying a choice symbol, which has no effect - Emit a warning when KCONFIG_PROBABILITY is malformed - Introduce def_string / def_int / def_hex to mirror the existing def_bool / def_tristate to succinctly set a value and type at the same time. - Add cc-option-str and ld-option-str macros to act like Kbuild's cc-option and ld-option, returning the string when the option is supported, allowing many checks to be moved into Kconfig - Minor usability improvements to Kconfig tests"* tag 'kbuild-7.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (59 commits) kbuild: AutoFDO: Update split machine function argument for upstream rename kbuild: Mark the initcall ordering recipe as recursive kbuild: Mark the gzip recipes as recursive localmodconfig: Explicitly report boolean configs during integrity check scripts/make_fit: Ignore schema checks when decomposing DTBs clang-tools: Import os for broken pipe handling kconfig: use the value argument in sym_get_near_range_bound() kconfig: fix infinite loop in conf_choice() when no choice value is visible kconfig: cleanup stale comment about 'keys' array kconfig: Improve ergonomics around disabling warnings with cc-option scripts/Kconfig.toolchain: Drop compiler symbols from dependencies checkkconfigsymbols.py: Parse Git status output line by line gen_init_cpio: stop parsing on lines with a missing argument list .gitignore: drop Module.markers .gitignore: ignore pacman package signatures kbuild: add header check facility as a manually run static analyzer Documentation: dev-tools: refer to user ID rather than id Documentation: dev-tools: update container.rst with config file scripts: add TOML config to container tool kconfig: tests: {old,save}defconfig: Forward dynamic keyword arguments ... List of files: /linux/arch/alpha/boot/compressed/Makefile

7fa247f96315d00511615bd9a36dca3f3906c621 - alpha: support the remaining kernel compression formats

Sat, 17 Oct 2026 18:53:35 +0200

alpha: support the remaining kernel compression formatsNothing about the boot stub is specific to gzip, so wire up bzip2, lz4,lzma, lzo, xz and zstd as well: select the matching HAVE_KERNEL_*symbol, add a suffix-y entry and a compression rule for the piggy-backedimage, and include the decompressor into the stub's misc.c.Only gzip's trailer already carries the uncompressed size, so the otherformats use the _with_size variants; output_len, which vmlinux.scr takesfrom the last 4 bytes of the payload, then works for all of them. Thestub passes it to __decompress(), which zstd requires.Signed-off-by: Matt Turner Reviewed-by: Magnus Lindholm Tested-by: Magnus Lindholm Link: https://lore.kernel.org/r/20261017-alpha-kernel-compression-v2-3-c71e6b08dc63@gmail.comSigned-off-by: Magnus Lindholm List of files: /linux/arch/alpha/boot/compressed/Makefile

c437950dceb88a92ca526f5ce3afd327c4fce457 - alpha: add self-extracting compressed kernel boot stub

Sat, 17 Oct 2026 18:53:34 +0200

alpha: add self-extracting compressed kernel boot stubAlpha only ever supported gzip for the kernel image, and did so in a wayout of step with every other architecture: aboot, the disk boot loader,decompresses vmlinux.gz itself with its own bundled inflate code, soadding a compression format meant writing a new decompressor insideaboot as well as in the kernel.Build a proper self-extracting arch/alpha/boot/compressed/vmlinuxinstead, modeled on parisc: a small ELF stub with the real, compressedvmlinux linked in, which decompresses the kernel, relocates it intoplace and jumps to its entry point. aboot needs no changes.The stub has no sanitizer or coverage runtime and must run on any Alpha,so it builds private copies of the arch/alpha/lib/ memory and divisionroutines it needs instead of linking lib.a, whose objects carry thekernel's instrumentation and -mcpu=.The build now emits arch/alpha/boot/vmlinuz rather than vmlinux.gz,which was never a name aboot cared about and would be a lie for an ELFstub: the bootpz path in the same directory still produces real gzipdata as vmlinux.nh.gz. Existing aboot.conf files name the image as itwas installed in /boot, so only the command that copies it out of thebuild tree changes.Unlike parisc and mips, the stub is linked at START_ADDR rather than ata separate low address; see compressed/vmlinux.lds.S. It has no consoleoutput, since bringing up the HWRPB console callbacks needs more thanthe CRB dispatch the kernel proper does much later, so error() justhalts.The legacy SRM netboot path (bootpz.c) is left alone: it has its ownboot protocol (PALcode reinitialization, self-populated ZERO_PGE,build-time-computed image sizes) that does not fit this design without aseparate rewrite, and keeps using plain gzip via vmlinux.nh.gz.Co-developed-by: Magnus Lindholm Signed-off-by: Magnus Lindholm Signed-off-by: Matt Turner Reviewed-by: Magnus Lindholm Tested-by: Magnus Lindholm Link: https://lore.kernel.org/r/20261017-alpha-kernel-compression-v2-2-c71e6b08dc63@gmail.comSigned-off-by: Magnus Lindholm List of files: /linux/arch/alpha/boot/compressed/Makefile