Changes in Makefile

ec4c28276c140a9338700041112f64f8d7ccc3e9 - kbuild: Consolidate C dialect options

Mon, 23 Feb 2026 20:10:28 +0100

kbuild: Consolidate C dialect optionsIntroduce CC_FLAGS_DIALECT to make it easier to update the variousplaces in the tree that rely on the GNU C standard and Microsoftextensions flags atomically. All remaining uses of '-std=gnu11' and'-fms-extensions' are in the tools directory (which has its own buildsystem) and other standalone Makefiles. This will allow the kernel touse a narrower option to enable the Microsoft anonymous tagged structureextension in a simpler manner. Place the CC_FLAGS_DIALECT block afterthe configuration include (so that a future change can move theselection of the flag to Kconfig) but before thearch/$(SRCARCH)/Makefile include (so that CC_FLAGS_DIALECT is availablefor use in those Makefiles).Signed-off-by: Nathan Chancellor Reviewed-by: Nicolas Schier Acked-by: Ard Biesheuvel Acked-by: Helge Deller # pariscLink: https://patch.msgid.link/20260223-fms-anonymous-structs-v1-1-8ee406d3c36c@kernel.orgSigned-off-by: Nicolas Schier List of files: /linux/arch/powerpc/boot/Makefile

5ff8ad3909524ad55297a434f87c238224825bf4 - kbuild: Add '-fms-extensions' to areas with dedicated CFLAGS

Fri, 31 Oct 2025 02:26:28 +0100

kbuild: Add '-fms-extensions' to areas with dedicated CFLAGSThis is a follow up to commit c4781dc3d1cf ("Kbuild: enable-fms-extensions") but in a separate change due to being substantiallydifferent from the initial submission.There are many places within the kernel that use their own CFLAGSinstead of the main KBUILD_CFLAGS, meaning code written with the mainkernel's use of '-fms-extensions' in mind that may be tangentiallyincluded in these areas will result in "error: declaration does notdeclare anything" messages from the compiler.Add '-fms-extensions' to all these areas to ensure consistency, alongwith -Wno-microsoft-anon-tag to silence clang's warning about use of theextension that the kernel cares about using. parisc does not build withclang so it does not need this warning flag. LoongArch does not need iteither because -W flags from KBUILD_FLAGS are pulled into cflags-vdso.Reported-by: Christian Brauner Closes: https://lore.kernel.org/20251030-meerjungfrau-getrocknet-7b46eacc215d@brauner/Reviewed-by: Christian Brauner Acked-by: Ard Biesheuvel Signed-off-by: Nathan Chancellor List of files: /linux/arch/powerpc/boot/Makefile

eb59d4c5948d93e940b5dde9d1bf3b33367fbcb8 - powerpc: use always-y instead of extra-y in Makefiles

Mon, 02 Jun 2025 18:32:24 +0200

powerpc: use always-y instead of extra-y in MakefilesThe extra-y syntax is planned for deprecation because it is similarto always-y.When building the boot wrapper, always-y and extra-y are equivalent.Use always-y instead.In arch/powerpc/kernel/Makefile, I added ifdef KBUILD_BUILTIN tokeep the current behavior: prom_init_check is skipped when buildingonly modular objects.Signed-off-by: Masahiro Yamada Acked-by: Michael Ellerman Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250602163302.478765-1-masahiroy@kernel.org List of files: /linux/arch/powerpc/boot/Makefile

5a821e2d69e26b51b7f3740b6b0c3462b8cacaff - powerpc/boot: Fix build with gcc 15

Mon, 31 Mar 2025 12:57:19 +0200

powerpc/boot: Fix build with gcc 15Similar to x86 the ppc boot code does not build with GCC 15.Copy the fix fromcommit ee2ab467bddf ("x86/boot: Use '-std=gnu11' to fix build with GCC 15")Signed-off-by: Michal Suchanek Tested-by: Amit Machhiwal Tested-by: Venkat Rao Bagalkote Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250331105722.19709-1-msuchanek@suse.de List of files: /linux/arch/powerpc/boot/Makefile

de9d1be44e5060bf0ce43ad2069908c802d7aa5e - powerpc: Remove IBM_CELL_BLADE & SPIDER_NET references

Wed, 18 Dec 2024 11:54:52 +0100

powerpc: Remove IBM_CELL_BLADE & SPIDER_NET referencesThe symbols are no longer selectable so remove references to them.Signed-off-by: Michael Ellerman Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20241218105523.416573-4-mpe@ellerman.id.au List of files: /linux/arch/powerpc/boot/Makefile

62f8f307c80e99ab18d38aa1a5bbbc18128ee5f8 - powerpc/64: Remove maple platform

Sun, 13 Oct 2024 12:29:57 +0200

powerpc/64: Remove maple platformThe maple platform was added in 2004 [1], to support the "Maple" 970FXevaluation board.It was later used for IBM JS20/JS21 machines, as well as the Biminimachine, aka "Yellow Dog Powerstation".Sadly all those machines have passed into memory, and there's been noevidence for years that anyone is still using any of them.Remove the platform and related code. It can always be reinstated ifthere's interest.Note that this has no impact on support for 970FX based Power Macs.[1]: https://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux-fullhistory.git/commit/?id=f0d068d65c5e555ffcfbc189de32598f6f00770cSigned-off-by: Michael Ellerman Link: https://patch.msgid.link/20241013102957.548291-1-mpe@ellerman.id.au List of files: /linux/arch/powerpc/boot/Makefile

839ff58e63ce30988205706aa9ed22bd6bf229f3 - powerpc/boot: Remove all 40x platforms from boot

Fri, 28 Jun 2024 14:11:56 +0200

powerpc/boot: Remove all 40x platforms from bootRemove 40x platforms from the boot directory.Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/20240628121201.130802-2-mpe@ellerman.id.au List of files: /linux/arch/powerpc/boot/Makefile

ff9a79307f89563da6d841da8b7cc4a0afceb0e2 - Merge tag 'kbuild-v6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Sat, 18 May 2024 21:39:20 +0200

Merge tag 'kbuild-v6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildPull Kbuild updates from Masahiro Yamada: - Avoid 'constexpr', which is a keyword in C23 - Allow 'dtbs_check' and 'dt_compatible_check' run independently of 'dt_binding_check' - Fix weak references to avoid GOT entries in position-independent code generation - Convert the last use of 'optional' property in arch/sh/Kconfig - Remove support for the 'optional' property in Kconfig - Remove support for Clang's ThinLTO caching, which does not work with the .incbin directive - Change the semantics of $(src) so it always points to the source directory, which fixes Makefile inconsistencies between upstream and downstream - Fix 'make tar-pkg' for RISC-V to produce a consistent package - Provide reasonable default coverage for objtool, sanitizers, and profilers - Remove redundant OBJECT_FILES_NON_STANDARD, KASAN_SANITIZE, etc. - Remove the last use of tristate choice in drivers/rapidio/Kconfig - Various cleanups and fixes in Kconfig* tag 'kbuild-v6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (46 commits) kconfig: use sym_get_choice_menu() in sym_check_prop() rapidio: remove choice for enumeration kconfig: lxdialog: remove initialization with A_NORMAL kconfig: m/nconf: merge two item_add_str() calls kconfig: m/nconf: remove dead code to display value of bool choice kconfig: m/nconf: remove dead code to display children of choice members kconfig: gconf: show checkbox for choice correctly kbuild: use GCOV_PROFILE and KCSAN_SANITIZE in scripts/Makefile.modfinal Makefile: remove redundant tool coverage variables kbuild: provide reasonable defaults for tool coverage modules: Drop the .export_symbol section from the final modules kconfig: use menu_list_for_each_sym() in sym_check_choice_deps() kconfig: use sym_get_choice_menu() in conf_write_defconfig() kconfig: add sym_get_choice_menu() helper kconfig: turn defaults and additional prompt for choice members into error kconfig: turn missing prompt for choice members into error kconfig: turn conf_choice() into void function kconfig: use linked list in sym_set_changed() kconfig: gconf: use MENU_CHANGED instead of SYMBOL_CHANGED kconfig: gconf: remove debug code ... List of files: /linux/arch/powerpc/boot/Makefile

b1992c3772e69a6fd0e3fc81cd4d2820c8b6eca0 - kbuild: use $(src) instead of $(srctree)/$(src) for source directory

Sat, 27 Apr 2024 16:55:02 +0200

kbuild: use $(src) instead of $(srctree)/$(src) for source directoryKbuild conventionally uses $(obj)/ for generated files, and $(src)/ forchecked-in source files. It is merely a convention without any functionaldifference. In fact, $(obj) and $(src) are exactly the same, as definedin scripts/Makefile.build: src := $(obj)When the kernel is built in a separate output directory, $(src) doesnot accurately reflect the source directory location. While Kbuildresolves this discrepancy by specifying VPATH=$(srctree) to search forsource files, it does not cover all cases. For example, when adding aheader search path for local headers, -I$(srctree)/$(src) is typicallypassed to the compiler.This introduces inconsistency between upstream and downstream Makefilesbecause $(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 followingmeanings: $(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 treeConsequently, $(srctree)/$(src) in upstream Makefiles need to be replacedwith $(src).Signed-off-by: Masahiro Yamada Reviewed-by: Nicolas Schier List of files: /linux/arch/powerpc/boot/Makefile

0ddbbb8960eaf91c7b432ec80566dfa60a8d79e4 - powerpc: Fix typos

Thu, 04 Jan 2024 00:16:04 +0100

powerpc: Fix typosFix typos, most reported by "codespell arch/powerpc". Only touchescomments, no code changes.Signed-off-by: Bjorn Helgaas Signed-off-by: Michael Ellerman Link: https://msgid.link/20240103231605.1801364-8-helgaas@kernel.org List of files: /linux/arch/powerpc/boot/Makefile

b751ed04bc5e1b76f2885b846ea8289792a37166 - powerpc: drop MPC85xx_CDS platform support

Tue, 20 Jun 2023 06:33:00 +0200

powerpc: drop MPC85xx_CDS platform supportThe MPC8541/8548/8555 Configurable Development System (CDS) were thevehicle used to provide evaluation of the 1st e500-v2 CPUs around 2007.Similar to the earlier MPC83xx-MDS systems we removed, the "brains"exist on a PCI-X card, but additional connectors exist to the right ofthe PCI-X slot, two structural metal pins are used to provide stabilityin a vertical ATX mounting, and the CPU is now on a daughter-card vs. aclamped down BGA.Given the extra complexity and risk of connector damage, the 8548CDSI had access to came pre-assembled in a basic white Antec case commonfor that era, and I'm inclined to assume that was the default.Power was typical "Pentium4" 2005 ATX - the main 20 pin connector wentto the PCI ATX form factor backplane, and the 4 pin black/yellow wentto the CPU card.Like previous evaluation boards, they attempted to provide break-outconnectors for as many features as possible, and that made for a fairlycomplex looking system.In any case, these are over 15 years old, and fairly complex systems,originally made for a small group of industry related people, and madefor use where quiet fan operation wasn't important. Given that, itmakes sense to remove support from them in 2023.Signed-off-by: Paul Gortmaker Signed-off-by: Michael Ellerman Link: https://msgid.link/20230620043300.197546-3-paul.gortmaker@windriver.com List of files: /linux/arch/powerpc/boot/Makefile

384e338a9187e479349c97c9cfb36f6060708db8 - powerpc: drop MPC8540_ADS and MPC8560_ADS platform support

Tue, 20 Jun 2023 06:32:59 +0200

powerpc: drop MPC8540_ADS and MPC8560_ADS platform supportBased on the revision history in the manual(s), these e500-v1platforms were first available around 2002.Like a lot of evaluation boards, they attempted to provide break-outconnectors for all possible features, and that combined with fourPCI-X slots (and the age/era) meant for a considerably large board.As I recall it, from a Linux point of view, the biggest differencebetween 8540 and 8560 was in the UART implementation, and that isreflected in a diff of the defconfigs.In any case, these are over 20 years old, and by today's standardsonly have a small amount of DDR1 memory, and were not widely available.Given that, it makes sense to remove support from them in 2023.Signed-off-by: Paul Gortmaker Signed-off-by: Michael Ellerman Link: https://msgid.link/20230620043300.197546-2-paul.gortmaker@windriver.com List of files: /linux/arch/powerpc/boot/Makefile

f5df87b855fd835ff0f4928575adbf4f5302bb40 - powerpc/build: Remove -pipe from compilation flags

Tue, 06 Jun 2023 08:48:30 +0200

powerpc/build: Remove -pipe from compilation flagsx86 removed -pipe in commit 437e88ab8f9e2 ("x86/build: Remove -pipe fromKBUILD_CFLAGS") and the newer arm64 and riscv seem to have never used it,so that seems to be the way the world's going.Compile performance building defconfig on a POWER10 PowerNV systemwas in the noise after 10 builds each. No point in adding options unlessthey help something, so remove it.Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230606064830.184083-1-npiggin@gmail.com List of files: /linux/arch/powerpc/boot/Makefile

8bce81dbce4f3563fffca48ebfce208b1112ab09 - powerpc/boot: Clean up Makefile after cflags and asflags separation

Tue, 06 Jun 2023 08:46:57 +0200

powerpc/boot: Clean up Makefile after cflags and asflags separationTidy pass over boot Makefile. Move variables together where possible.Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230606064657.183969-5-npiggin@gmail.com List of files: /linux/arch/powerpc/boot/Makefile

54194a2fab4f78b96347882cf27894f76833c631 - powerpc/boot: Separate BOOTCFLAGS from BOOTASFLAGS

Tue, 06 Jun 2023 08:46:56 +0200

powerpc/boot: Separate BOOTCFLAGS from BOOTASFLAGSBOOTCFLAGS no longer contains anything that BOOTASFLAGS needs (except-pipe). Separate them to avoid fragility with cross-contamination offlags which has caused several build problems.Suggested-by: Linus Torvalds Link: https://lore.kernel.org/lkml/CAHk-=whyWUdJDeOBN1hRWYSkQkvzYiQ5RbSW5rJjExgnbSNX9Q@mail.gmail.com/Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230606064657.183969-4-npiggin@gmail.com List of files: /linux/arch/powerpc/boot/Makefile

d1b7d40d4ffa02d59e72abf31ee2119778c6673e - powerpc/boot: Separate CPP flags from BOOTCFLAGS

Tue, 06 Jun 2023 08:46:55 +0200

powerpc/boot: Separate CPP flags from BOOTCFLAGSAdd BOOTCPPFLAGS variable for the CPP options required by C and AS.Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230606064657.183969-3-npiggin@gmail.com List of files: /linux/arch/powerpc/boot/Makefile

689d592e406983debe919acb87855cab0f25b7bc - powerpc/boot: Separate target flags from BOOTCFLAGS

Tue, 06 Jun 2023 08:46:54 +0200

powerpc/boot: Separate target flags from BOOTCFLAGSAdd BOOTTARGETFLAGS variable with target / ABI options common toCFLAGS and AFLAGS.Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230606064657.183969-2-npiggin@gmail.com List of files: /linux/arch/powerpc/boot/Makefile

2b694fc96fe33a7c042e3a142d27d945c8c668b0 - powerpc/boot: Disable power10 features after BOOTAFLAGS assignment

Thu, 27 Apr 2023 21:34:53 +0200

powerpc/boot: Disable power10 features after BOOTAFLAGS assignmentWhen building the boot wrapper assembly files with clang aftercommit 648a1783fe25 ("powerpc/boot: Fix boot wrapper code generationwith CONFIG_POWER10_CPU"), the following warnings appear for each filebuilt: '-prefixed' is not a recognized feature for this target (ignoring feature) '-pcrel' is not a recognized feature for this target (ignoring feature)While it is questionable whether or not LLVM should be emitting awarning when passed negative versions of code generation flags whenbuilding assembly files (since it does not emit a warning for thealtivec and vsx flags), it is easy enough to work around this by justmoving the disabled flags to BOOTCFLAGS after the assignment ofBOOTAFLAGS, so that they are not added when building assembly files.Do so to silence the warnings.Fixes: 648a1783fe25 ("powerpc/boot: Fix boot wrapper code generation with CONFIG_POWER10_CPU")Link: https://github.com/ClangBuiltLinux/linux/issues/1839Reviewed-by: Nicholas Piggin Signed-off-by: Nathan Chancellor Signed-off-by: Michael Ellerman Link: https://msgid.link/20230427-remove-power10-args-from-boot-aflags-clang-v1-1-9107f7c943bc@kernel.org List of files: /linux/arch/powerpc/boot/Makefile

859b21a008ebcc7fd876f50738f63750d46b5296 - powerpc: drop PowerQUICC II Family ADS platform support

Fri, 24 Feb 2023 21:49:58 +0100

powerpc: drop PowerQUICC II Family ADS platform supportBased on documentation revision dates, this MPC82xx pq2fads systempredates the MPC8272-ADS variant by about a year and only has 1/2the amount of RAM (32MB) -- largely making it useless with a modernv6.x kernel from today.Similar to the MPC8272-ADS the pq2fads also supported other 82xx CPUvariants, had 8MB flash, and like the 8272 ADS platform, was on a fairlylarge PCB in order to have space for breakout connectors for all features.These 82xx platforms are two decades old, and originally made for asmall group of industry related people in order to assist in new OEMboard designs. Given that, it makes sense to remove support today.Signed-off-by: Paul Gortmaker Signed-off-by: Michael Ellerman Link: https://msgid.link/20230224204959.17425-3-paul.gortmaker@windriver.com List of files: /linux/arch/powerpc/boot/Makefile

33777a4e9bb93f66ac2511d99ec66ab50f1a04bc - powerpc: drop MPC8272_ADS platform support

Fri, 24 Feb 2023 21:49:57 +0100

powerpc: drop MPC8272_ADS platform supportThe MPC8272-ADS also supported other 82xx CPU variants, had 64MB RAM,8MB flash, and like the 85xx ADS platforms, was on a fairly large PCBin order to have space for breakout connectors for all the features.These 82xx platforms are two decades old, and originally made for asmall group of industry related people in order to assist in new OEMboard designs. Given that, it makes sense to remove support today.Signed-off-by: Paul Gortmaker Signed-off-by: Michael Ellerman Link: https://msgid.link/20230224204959.17425-2-paul.gortmaker@windriver.com List of files: /linux/arch/powerpc/boot/Makefile