Changes in Kbuild

c06cd66387da92e6cdac44e16c7b5ef9219c53ac - percpu: Sanitize __percpu_qual include hell

Tue, 02 Jun 2026 11:09:21 +0200

percpu: Sanitize __percpu_qual include hellSlapping __percpu_qual into the next available header is sloppy at best.It's required by __percpu which is defined in compiler_types.h and that ismeant to be included without requiring a boatload of other headers so thata struct or function declaration can contain a __percpu qualifier w/ofurther prerequisites.This implicit dependency on linux/percpu.h makes that impossible and causesa major problem when trying to separate headers.Create asm/percpu_types.h and move it there. Include that fromcompiler_types.h and the whole recursion problem goes away.Fix up UM so it uses the generic header and includes it in the UM_HOSTbuild, which pulls in compiler_types.h. The USER_CFLAGS fix was suggestedby Richard.Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260602090535.254874125@kernel.org List of files: /linux/include/asm-generic/Kbuild

e20043b4765cdf7ec8e963d706bb91469cba8cb8 - xor: make xor.ko self-contained in lib/raid/

Fri, 27 Mar 2026 07:16:53 +0100

xor: make xor.ko self-contained in lib/raid/Move the asm/xor.h headers to lib/raid/xor/$(SRCARCH)/xor_arch.h andinclude/linux/raid/xor_impl.h to lib/raid/xor/xor_impl.h so that thexor.ko module implementation is self-contained in lib/raid/.As this remove the asm-generic mechanism a new kconfig symbol is added toindicate that a architecture-specific implementations exists, andxor_arch.h should be included.Link: https://lkml.kernel.org/r/20260327061704.3707577-22-hch@lst.deSigned-off-by: Christoph Hellwig Reviewed-by: Eric Biggers Tested-by: Eric Biggers Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: Anton Ivanov Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David S. Miller Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Jason A. Donenfeld Cc: Johannes Berg Cc: Li Nan Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Matt Turner Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Richard Henderson Cc: Richard Weinberger Cc: Russell King Cc: Song Liu Cc: Sven Schnelle Cc: Ted Ts'o Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux/include/asm-generic/Kbuild

01122b89361e565b3c88b9fbebe92dc5c7420cb7 - perf: Use EXPORT_SYMBOL_FOR_KVM() for the mediated APIs

Wed, 17 Dec 2025 13:23:59 +0100

perf: Use EXPORT_SYMBOL_FOR_KVM() for the mediated APIsSigned-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20251208115156.GE3707891@noisy.programming.kicks-ass.net List of files: /linux/include/asm-generic/Kbuild

71753c6ed2bf2aee5be26c1bc06a94c9e3713ade - unwind_user: Add user space unwinding API with frame pointer support

Tue, 29 Jul 2025 20:23:05 +0200

unwind_user: Add user space unwinding API with frame pointer supportIntroduce a generic API for unwinding user stacks.In order to expand user space unwinding to be able to handle more complexscenarios, such as deferred unwinding and reading user space information,create a generic interface that all architectures can use that support thevarious unwinding methods.This is an alternative method for handling user space stack traces fromthe simple stack_trace_save_user() API. This does not replace thatinterface, but this interface will be used to expand the functionality ofuser space stack walking.None of the structures introduced will be exposed to user space tooling.Support for frame pointer unwinding is added. For an architecture tosupport frame pointer unwinding it needs to enableCONFIG_HAVE_UNWIND_USER_FP and define ARCH_INIT_USER_FP_FRAME.By encoding the frame offsets in struct unwind_user_frame, much of thiscode can also be reused for future unwinder implementations like sframe.Cc: Masami Hiramatsu Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Andrii Nakryiko Cc: Indu Bhagat Cc: "Jose E. Marchesi" Cc: Beau Belgrave Cc: Linus Torvalds Cc: Andrew Morton Cc: Jens Axboe Cc: Florian Weimer Cc: Sam James Link: https://lore.kernel.org/20250729182404.975790139@kernel.orgReviewed-by: Jens Remus Signed-off-by: Josh Poimboeuf Co-developed-by: Mathieu Desnoyers Link: https://lore.kernel.org/all/20250710164301.3094-2-mathieu.desnoyers@efficios.com/Signed-off-by: Mathieu Desnoyers Co-developed-by: Steven Rostedt (Google) Signed-off-by: Steven Rostedt (Google) List of files: /linux/include/asm-generic/Kbuild

e2082e32fd57976e811086708043c136ee596978 - rqspinlock: Add entry to Makefile, MAINTAINERS

Sun, 16 Mar 2025 05:05:33 +0100

rqspinlock: Add entry to Makefile, MAINTAINERSEnsure that the rqspinlock code is only built when the BPF subsystem iscompiled in. Depending on queued spinlock support, we may or may not endup building the queued spinlock slowpath, and instead fallback to thetest-and-set implementation. Also add entries to MAINTAINERS file.Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20250316040541.108729-18-memxor@gmail.comSigned-off-by: Alexei Starovoitov List of files: /linux/include/asm-generic/Kbuild

5f60d5f6bbc12e782fac78110b0ee62698f3b576 - move asm/unaligned.h to linux/unaligned.h

Tue, 01 Oct 2024 21:35:57 +0200

move asm/unaligned.h to linux/unaligned.hasm/unaligned.h is always an include of asm-generic/unaligned.h;might as well move that thing to linux/unaligned.h and includethat - there's nothing arch-specific in that header.auto-generated by the following:for i in `git grep -l -w asm/unaligned.h`; do sed -i -e "s/asm\/unaligned.h/linux\/unaligned.h/" $idonefor i in `git grep -l -w asm-generic/unaligned.h`; do sed -i -e "s/asm-generic\/unaligned.h/linux\/unaligned.h/" $idonegit mv include/asm-generic/unaligned.h include/linux/unaligned.hgit mv tools/include/asm-generic/unaligned.h tools/include/linux/unaligned.hsed -i -e "/unaligned.h/d" include/asm-generic/Kbuildsed -i -e "s/__ASM_GENERIC/__LINUX/" include/linux/unaligned.h tools/include/linux/unaligned.h List of files: /linux/include/asm-generic/Kbuild

d80f2996b8502779c39221a9e7c9ea7e361c0ae4 - Merge tag 'asm-generic-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Tue, 16 Jul 2024 21:09:03 +0200

Merge tag 'asm-generic-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-genericPull asm-generic updates from Arnd Bergmann: "Most of this is part of my ongoing work to clean up the system call tables. In this bit, all of the newer architectures are converted to use the machine readable syscall.tbl format instead in place of complex macros in include/uapi/asm-generic/unistd.h. This follows an earlier series that fixed various API mismatches and in turn is used as the base for planned simplifications. The other two patches are dead code removal and a warning fix"* tag 'asm-generic-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: vmlinux.lds.h: catch .bss..L* sections into BSS") fixmap: Remove unused set_fixmap_offset_io() riscv: convert to generic syscall table openrisc: convert to generic syscall table nios2: convert to generic syscall table loongarch: convert to generic syscall table hexagon: use new system call table csky: convert to generic syscall table arm64: rework compat syscall macros arm64: generate 64-bit syscall.tbl arm64: convert unistd_32.h to syscall.tbl format arc: convert to generic syscall table clone3: drop __ARCH_WANT_SYS_CLONE3 macro kbuild: add syscall table generation to scripts/Makefile.asm-headers kbuild: verify asm-generic header list loongarch: avoid generating extra header files um: don't generate asm/bpf_perf_event.h csky: drop asm/gpio.h wrapper syscalls: add generic scripts/syscall.tbl List of files: /linux/include/asm-generic/Kbuild

b70f12e962bc73a091a7b853f24ae2049613c684 - kbuild: verify asm-generic header list

Fri, 26 Apr 2024 08:44:51 +0200

kbuild: verify asm-generic header listIn order to integrate the system call header generation with generatingthe asm-generic wrappers, restrict the generated headers to those thatactually exist in include/asm-generic/.The path is already known, so add these as a dependency.The asm-generic/bugs.h header was removed in commit 61235b24b9cb ("init:Remove check_bugs() leftovers"), which now causes a build failure, sodrop it from the list.Signed-off-by: Arnd Bergmann List of files: /linux/include/asm-generic/Kbuild

e78298556ee5d881f6679effb2a6743969ea6e2d - runtime constants: add default dummy infrastructure

Tue, 04 Jun 2024 21:30:02 +0200

runtime constants: add default dummy infrastructureThis adds the initial dummy support for 'runtime constants' for whenan architecture doesn't actually support an implementation of fixingup said runtime constants.This ends up being the fallback to just using the variables as regular__ro_after_init variables, and changes the dcache d_hash() function touse this model.Signed-off-by: Linus Torvalds List of files: /linux/include/asm-generic/Kbuild

2fd001cd36005846caa6456fff1008c6f5bae9d4 - arch: Rename fbdev header and source files

Fri, 29 Mar 2024 21:32:12 +0100

arch: Rename fbdev header and source filesThe per-architecture fbdev code has no dependencies on fbdev and canbe used for any video-related subsystem. Rename the files to 'video'.Use video-sti.c on parisc as the source file depends on CONFIG_STI_CORE.On arc, arm, arm64, sh, and um the asm header file is an empty wrapperaround the file in asm-generic. Let Kbuild generate the file. The buildsystem does this automatically. Only um needs to generate video.hexplicitly, so that it overrides the host architecture's header. Thelatter would otherwise interfere with the build.Further update all includes statements, include guards, and Makefiles.Also update a few strings and comments to refer to video instead offbdev.v3:- arc, arm, arm64, sh: generate asm header via build system (Sam,Helge, Arnd)- um: rename fb.h to video.h- fix typo in commit message (Sam)Signed-off-by: Thomas Zimmermann Reviewed-by: Sam Ravnborg Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Geert Uytterhoeven Cc: Thomas Bogendoerfer Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Yoshinori Sato Cc: Rich Felker Cc: John Paul Adrian Glaubitz Cc: "David S. Miller" Cc: Andreas Larsson Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.orgCc: "H. Peter Anvin" Signed-off-by: Arnd Bergmann List of files: /linux/include/asm-generic/Kbuild

4382159696c9af67ee047ed55f2dbf05480f52f6 - cfi: Flip headers

Fri, 15 Dec 2023 10:12:17 +0100

cfi: Flip headersNormal include order is that linux/foo.h should include asm/foo.h, CFI has itthe wrong way around.Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Sami Tolvanen Link: https://lore.kernel.org/r/20231215092707.231038174@infradead.orgSigned-off-by: Alexei Starovoitov List of files: /linux/include/asm-generic/Kbuild

f82060480095a909291adc90d5579f50b6ec0627 - asm-generic: Fix spelling of architecture

Mon, 24 Jul 2023 15:43:01 +0200

asm-generic: Fix spelling of architectureFix spelling of "architecture" in the Kbuild file.Signed-off-by: Andy Shevchenko Acked-by: Randy Dunlap Signed-off-by: Arnd Bergmann List of files: /linux/include/asm-generic/Kbuild

7447691ef994ffd8072809a11ca9167a2d91564f - Merge tag 'for-linus-6.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Fri, 05 Aug 2022 00:10:55 +0200

Merge tag 'for-linus-6.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tipPull xen updates from Juergen Gross: - a series fine tuning virtio support for Xen guests, including removal the now again unused "platform_has()" feature. - a fix for host admin triggered reboot of Xen guests - a simple spelling fix* tag 'for-linus-6.0-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: don't require virtio with grants for non-PV guests kernel: remove platform_has() infrastructure virtio: replace restricted mem access flag with callback xen: Fix spelling mistake xen/manage: Use orderly_reboot() to reboot List of files: /linux/include/asm-generic/Kbuild

a870544ca9d215449e91ebc01e35d80b23151c78 - kernel: remove platform_has() infrastructure

Wed, 22 Jun 2022 08:38:37 +0200

kernel: remove platform_has() infrastructureThe only use case of the platform_has() infrastructure has beenremoved again, so remove the whole feature.Signed-off-by: Juergen Gross Tested-by: Oleksandr Tyshchenko # Arm64 guest using XenReviewed-by: Stefano Stabellini Link: https://lore.kernel.org/r/20220622063838.8854-3-jgross@suse.comSigned-off-by: Juergen Gross List of files: /linux/include/asm-generic/Kbuild

9592eef7c16ec5fb9f36c4d9abe8eeffc2e1d2f3 - random: remove CONFIG_ARCH_RANDOM

Tue, 05 Jul 2022 20:48:41 +0200

random: remove CONFIG_ARCH_RANDOMWhen RDRAND was introduced, there was much discussion on whether itshould be trusted and how the kernel should handle that. Initially, twomechanisms cropped up, CONFIG_ARCH_RANDOM, a compile time switch, and"nordrand", a boot-time switch.Later the thinking evolved. With a properly designed RNG, using RDRANDvalues alone won't harm anything, even if the outputs are malicious.Rather, the issue is whether those values are being *trusted* to be goodor not. And so a new set of options were introduced as the realones that people use -- CONFIG_RANDOM_TRUST_CPU and "random.trust_cpu".With these options, RDRAND is used, but it's not always credited. So inthe worst case, it does nothing, and in the best case, maybe it helps.Along the way, CONFIG_ARCH_RANDOM's meaning got sort of pulled into thecenter and became something certain platforms force-select.The old options don't really help with much, and it's a bit odd to havespecial handling for these instructions when the kernel can deal finewith the existence or untrusted existence or broken existence ornon-existence of that CPU capability.Simplify the situation by removing CONFIG_ARCH_RANDOM and using theordinary asm-generic fallback pattern instead, keeping the two optionsthat are actually used. For now it leaves "nordrand" for now, as theremoval of that will take a different route.Acked-by: Michael Ellerman Acked-by: Catalin Marinas Acked-by: Borislav Petkov Acked-by: Heiko Carstens Acked-by: Greg Kroah-Hartman Signed-off-by: Jason A. Donenfeld List of files: /linux/include/asm-generic/Kbuild

2130a790ca49763f724ec45cf93b9dd765e2023e - kernel: add platform_has() infrastructure

Thu, 02 Jun 2022 15:05:26 +0200

kernel: add platform_has() infrastructureAdd a simple infrastructure for setting, resetting and queryingplatform feature flags.Flags can be either global or architecture specific.Signed-off-by: Juergen Gross Reviewed-by: Oleksandr Tyshchenko Tested-by: Oleksandr Tyshchenko # Arm64 onlyReviewed-by: Christoph Hellwig Acked-by: Borislav Petkov Signed-off-by: Juergen Gross List of files: /linux/include/asm-generic/Kbuild

29c395c77a9a514c5857c45ceae2665e9bd99ac7 - Merge tag 'x86-entry-2021-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Thu, 25 Feb 2021 01:32:23 +0100

Merge tag 'x86-entry-2021-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull x86 irq entry updates from Thomas Gleixner: "The irq stack switching was moved out of the ASM entry code in course of the entry code consolidation. It ended up being suboptimal in various ways. This reworks the X86 irq stack handling: - Make the stack switching inline so the stackpointer manipulation is not longer at an easy to find place. - Get rid of the unnecessary indirect call. - Avoid the double stack switching in interrupt return and reuse the interrupt stack for softirq handling. - A objtool fix for CONFIG_FRAME_POINTER=y builds where it got confused about the stack pointer manipulation"* tag 'x86-entry-2021-02-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Fix stack-swizzle for FRAME_POINTER=y um: Enforce the usage of asm-generic/softirq_stack.h x86/softirq/64: Inline do_softirq_own_stack() softirq: Move do_softirq_own_stack() to generic asm header softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig x86: Select CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK x86/softirq: Remove indirection in do_softirq_own_stack() x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall x86/entry: Convert device interrupts to inline stack switching x86/entry: Convert system vectors to irq stack macro x86/irq: Provide macro for inlining irq stack switching x86/apic: Split out spurious handling code x86/irq/64: Adjust the per CPU irq stack pointer by 8 x86/irq: Sanitize irq stack tracking x86/entry: Fix instrumentation annotation List of files: /linux/include/asm-generic/Kbuild

731ecea3e5495aa6bd3cb8587f5267cf5e4220e2 - mm: Remove arch_remap() and mm-arch-hooks.h

Fri, 18 Dec 2020 15:07:58 +0100

mm: Remove arch_remap() and mm-arch-hooks.hpowerpc was the last provider of arch_remap() and the lastuser of mm-arch-hooks.h.Since commit 526a9c4a7234 ("powerpc/vdso: Provide vdso_remap()"),arch_remap() hence mm-arch-hooks.h are not used anymore.Remove them.Signed-off-by: Christophe Leroy Signed-off-by: Richard Weinberger List of files: /linux/include/asm-generic/Kbuild

db1cc7aede37eb9235759131ddfefd9c0ea5136f - softirq: Move do_softirq_own_stack() to generic asm header

Wed, 10 Feb 2021 00:40:53 +0100

softirq: Move do_softirq_own_stack() to generic asm headerTo avoid include recursion hell move the do_softirq_own_stack() relatedcontent into a generic asm header and include it from all places in arch/which need the prototype.This allows architectures to provide an inline implementation ofdo_softirq_own_stack() without introducing a lot of #ifdeffery all over theplace.Signed-off-by: Thomas Gleixner Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20210210002513.289960691@linutronix.de List of files: /linux/include/asm-generic/Kbuild

87dbc209ea04645fd2351981f09eff5d23f8e2e9 - local64.h: make mandatory

Wed, 30 Dec 2020 00:14:49 +0100

local64.h: make mandatoryMake mandatory in include/asm-generic/Kbuild andremove all arch/*/include/asm/local64.h arch-specific files since theyonly #include .This fixes build errors on arch/c6x/ and arch/nios2/ forblock/blk-iocost.c.Build-tested on 21 of 25 arch-es. (tools problems on the others)Yes, we could even rename to and change all #includes to use instead.Link: https://lkml.kernel.org/r/20201227024446.17018-1-rdunlap@infradead.orgSigned-off-by: Randy Dunlap Suggested-by: Christoph Hellwig Reviewed-by: Masahiro Yamada Cc: Jens Axboe Cc: Ley Foon Tan Cc: Mark Salter Cc: Aurelien Jacquiot Cc: Peter Zijlstra Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux/include/asm-generic/Kbuild