Changes in Kbuild

84132633 - x86/cpufeatures: Generate the header based on build config

Wed, 05 Mar 2025 18:47:22 +0000

x86/cpufeatures: Generate the header based on build configIntroduce an AWK script to auto-generate the headerwith required and disabled feature masks based on and the current build config.Thus for any CPU feature with a build config, e.g., X86_FRED, simply add: config X86_DISABLED_FEATURE_FRED def_bool y depends on !X86_FREDto arch/x86/Kconfig.cpufeatures, instead of adding a conditional CPUfeature disable flag, e.g., DISABLE_FRED.Lastly, the generated required and disabled feature masks will be added totheir corresponding feature masks for this particular compile-timeconfiguration. [ Xin: build integration improvements ] [ mingo: Improved changelog and comments ]Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li (Intel) Signed-off-by: Borislav Petkov (AMD) Signed-off-by: Ingo Molnar Reviewed-by: Nikolay Borisov Cc: Linus Torvalds Link: https://lore.kernel.org/r/20250305184725.3341760-3-xin@zytor.com List of files: /linux-6.15/arch/x86/include/asm/Kbuild

b5fa903b - fprobe: Add fprobe_header encoding feature

Thu, 26 Dec 2024 05:14:17 +0000

fprobe: Add fprobe_header encoding featureFprobe store its data structure address and size on the fgraph return stackby __fprobe_header. But most 64bit architecture can combine those toone unsigned long value because 4 MSB in the kernel address are the same.With this encoding, fprobe can consume less space on ret_stack.This introduces asm/fprobe.h to define arch dependent encode/decodemacros. Note that since fprobe depends on CONFIG_HAVE_FUNCTION_GRAPH_FREGS,currently only arm64, loongarch, riscv, s390 and x86 are supported.Signed-off-by: Masami Hiramatsu (Google) Acked-by: Heiko Carstens # s390Cc: Catalin Marinas Cc: Alexei Starovoitov Cc: Florent Revest Cc: Martin KaFai Lau Cc: bpf Cc: Alexei Starovoitov Cc: Jiri Olsa Cc: Alan Maguire Cc: Mark Rutland Cc: Heiko Carstens Cc: Will Deacon Cc: Huacai Chen Cc: WANG Xuerui Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.orgCc: "H. Peter Anvin" Cc: Arnd Bergmann Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Link: https://lore.kernel.org/173519005783.391279.5307910947400277525.stgit@devnote2Signed-off-by: Steven Rostedt (Google) List of files: /linux-6.15/arch/x86/include/asm/Kbuild

46bcce50 - arch, mm: move definition of node_data to generic code

Wed, 07 Aug 2024 06:40:51 +0000

arch, mm: move definition of node_data to generic codeEvery architecture that supports NUMA defines node_data in the same way: struct pglist_data *node_data[MAX_NUMNODES];No reason to keep multiple copies of this definition and its forwarddeclarations, especially when such forward declaration is the only thingin include/asm/mmzone.h for many architectures.Add definition and declaration of node_data to generic code and droparchitecture-specific versions.Link: https://lkml.kernel.org/r/20240807064110.1003856-8-rppt@kernel.orgSigned-off-by: Mike Rapoport (Microsoft) Acked-by: David Hildenbrand Reviewed-by: Jonathan Cameron Acked-by: Davidlohr Bueso Tested-by: Zi Yan # for x86_64 and arm64Tested-by: Jonathan Cameron [arm64 + CXL via QEMU]Acked-by: Dan Williams Cc: Alexander Gordeev Cc: Andreas Larsson Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christophe Leroy Cc: Dave Hansen Cc: David S. Miller Cc: Greg Kroah-Hartman Cc: Heiko Carstens Cc: Huacai Chen Cc: Ingo Molnar Cc: Jiaxun Yang Cc: John Paul Adrian Glaubitz Cc: Jonathan Corbet Cc: Michael Ellerman Cc: Palmer Dabbelt Cc: Rafael J. Wysocki Cc: Rob Herring (Arm) Cc: Samuel Holland Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/x86/include/asm/Kbuild

8b01de80 - x86/headers: Remove

Sun, 06 Aug 2023 14:59:57 +0000

x86/headers: Remove All *.S files under arch/x86/ have been converted to include instead of .Remove .Signed-off-by: Masahiro Yamada Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/20230806145958.380314-3-masahiroy@kernel.org List of files: /linux-6.15/arch/x86/include/asm/Kbuild

b9f174c8 - x86/unwind/orc: Add ELF section with ORC version identifier

Tue, 13 Jun 2023 21:14:56 +0000

x86/unwind/orc: Add ELF section with ORC version identifierCommits ffb1b4a41016 ("x86/unwind/orc: Add 'signal' field to ORCmetadata") and fb799447ae29 ("x86,objtool: Split UNWIND_HINT_EMPTY intwo") changed the ORC format. Although ORC is internal to the kernel,it's the only way for external tools to get reliable kernel stack traceson x86-64. In particular, the drgn debugger [1] uses ORC for stackunwinding, and these format changes broke it [2]. As the drgnmaintainer, I don't care how often or how much the kernel changes theORC format as long as I have a way to detect the change.It suffices to store a version identifier in the vmlinux and kernelmodule ELF files (to use when parsing ORC sections from ELF), and inkernel memory (to use when parsing ORC from a core dump+symbol table).Rather than hard-coding a version number that needs to be manuallybumped, Peterz suggested hashing the definitions from orc_types.h. Ifthere is a format change that isn't caught by this, the hashing scriptcan be updated.This patch adds an .orc_header allocated ELF section containing the20-byte hash to vmlinux and kernel modules, along with the corresponding__start_orc_header and __stop_orc_header symbols in vmlinux.1: https://github.com/osandov/drgn2: https://github.com/osandov/drgn/issues/303Fixes: ffb1b4a41016 ("x86/unwind/orc: Add 'signal' field to ORC metadata")Fixes: fb799447ae29 ("x86,objtool: Split UNWIND_HINT_EMPTY in two")Signed-off-by: Omar Sandoval Signed-off-by: Peter Zijlstra (Intel) Acked-by: Josh Poimboeuf Link: https://lkml.kernel.org/r/aef9c8dc43915b886a8c48509a12ec1b006ca1ca.1686690801.git.osandov@osandov.com List of files: /linux-6.15/arch/x86/include/asm/Kbuild

6218d0f6 - x86/syscalls: Switch to generic syscalltbl.sh

Mon, 17 May 2021 07:38:10 +0000

x86/syscalls: Switch to generic syscalltbl.shMany architectures duplicate similar shell scripts.Convert x86 and UML to use scripts/syscalltbl.sh. The generic scriptgenerates seperate headers for x86/64 and x86/x32 syscalls, while the x86specific script coalesced them into one. Adjust the code accordingly.Signed-off-by: Masahiro Yamada Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20210517073815.97426-3-masahiroy@kernel.org List of files: /linux-6.15/arch/x86/include/asm/Kbuild

630f289b - asm-generic: make more kernel-space headers mandatory

Thu, 02 Apr 2020 04:03:12 +0000

asm-generic: make more kernel-space headers mandatoryChange a header to mandatory-y if both of the following are met:[1] At least one architecture (except um) specifies it as generic-y in arch/*/include/asm/Kbuild[2] Every architecture (except um) either has its own implementation (arch/*/include/asm/*.h) or specifies it as generic-y in arch/*/include/asm/KbuildThis commit was generated by the following shell script.----------------------------------->8-----------------------------------arches=$(cd arch; ls -1 | sed -e '/Kconfig/d' -e '/um/d')tmpfile=$(mktemp)grep "^mandatory-y +=" include/asm-generic/Kbuild > $tmpfilefind arch -path 'arch/*/include/asm/Kbuild' | xargs sed -n 's/^generic-y += $.*$/\1/p' | sort -u |while read headerdo mandatory=yes for arch in $arches do if ! grep -q "generic-y += $header" arch/$arch/include/asm/Kbuild && ! [ -f arch/$arch/include/asm/$header ]; then mandatory=no break fi done if [ "$mandatory" = yes ]; then echo "mandatory-y += $header" >> $tmpfile for arch in $arches do sed -i "/generic-y += $header/d" arch/$arch/include/asm/Kbuild done fidonesed -i '/^mandatory-y +=/d' include/asm-generic/KbuildLANG=C sort $tmpfile >> include/asm-generic/Kbuild----------------------------------->8-----------------------------------One obvious benefit is the diff stat: 25 files changed, 52 insertions(+), 557 deletions(-)It is tedious to list generic-y for each arch that needs it.So, mandatory-y works like a fallback default (by just wrappingasm-generic one) when arch does not have a specific headerimplementation.See the following commits:def3f7cefe4e81c296090e1722a76551142c227ca1b39bae16a62ce4aae02d958224f19316d98b24It is tedious to convert headers one by one, so I processed by a shellscript.Signed-off-by: Masahiro Yamada Signed-off-by: Andrew Morton Cc: Michal Simek Cc: Christoph Hellwig Cc: Arnd Bergmann Link: http://lkml.kernel.org/r/20200210175452.5030-1-masahiroy@kernel.orgSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/x86/include/asm/Kbuild

def3f7ce - asm-generic: Make dma-contiguous.h a mandatory include/asm header

Fri, 17 Jan 2020 07:48:17 +0000

asm-generic: Make dma-contiguous.h a mandatory include/asm headerdma-continuguous.h is generic for all architectures except arm32 which hasits own version.Similar change was done for msi.h by commit a1b39bae16a6("asm-generic: Make msi.h a mandatory include/asm header")Suggested-by: Christoph Hellwig Link: https://lore.kernel.org/linux-arm-kernel/20200117080446.GA8980@lst.de/T/#m92bb56b04161057635d4142e1b3b9b6b0a70122eSigned-off-by: Michal Simek Reviewed-by: Christoph Hellwig Acked-by: Thomas Gleixner Acked-by: Arnd Bergmann Acked-by: Paul Walmsley # for arch/riscv List of files: /linux-6.15/arch/x86/include/asm/Kbuild

96ac6d43 - treewide: Add SPDX license identifier - Kbuild

Thu, 30 May 2019 12:03:44 +0000

treewide: Add SPDX license identifier - KbuildAdd SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any formThese files fall under the project license, GPL v2 only. The resulting SPDXlicense identifier is: GPL-2.0Reported-by: Masahiro Yamada Signed-off-by: Greg Kroah-Hartman Reviewed-by: Kate Stewart Signed-off-by: Greg Kroah-Hartman List of files: /linux-6.15/arch/x86/include/asm/Kbuild

fdcd06a8 - arch: Use asm-generic header for asm/mmiowb.h

Fri, 22 Feb 2019 12:49:41 +0000

arch: Use asm-generic header for asm/mmiowb.hHook up asm-generic/mmiowb.h to Kbuild for all architectures so that wecan subsequently include asm/mmiowb.h from core code.Cc: Masahiro Yamada Cc: Arnd Bergmann Acked-by: Linus Torvalds Signed-off-by: Will Deacon List of files: /linux-6.15/arch/x86/include/asm/Kbuild

7290d580 - module: use relative references for __ksymtab entries

Wed, 22 Aug 2018 04:56:09 +0000

module: use relative references for __ksymtab entriesAn ordinary arm64 defconfig build has ~64 KB worth of __ksymtab entries,each consisting of two 64-bit fields containing absolute references, tothe symbol itself and to a char array containing its name, respectively.When we build the same configuration with KASLR enabled, we end up with anadditional ~192 KB of relocations in the .init section, i.e., one 24 byteentry for each absolute reference, which all need to be processed at boottime.Given how the struct kernel_symbol that describes each entry is completelylocal to module.c (except for the references emitted by EXPORT_SYMBOL()itself), we can easily modify it to contain two 32-bit relative referencesinstead. This reduces the size of the __ksymtab section by 50% for all64-bit architectures, and gets rid of the runtime relocations entirely forarchitectures implementing KASLR, either via standard PIE linking (arm64)or using custom host tools (x86).Note that the binary search involving __ksymtab contents relies on eachsection being sorted by symbol name. This is implemented based on theinput section names, not the names in the ksymtab entries, so this patchdoes not interfere with that.Given that the use of place-relative relocations requires support both inthe toolchain and in the module loader, we cannot enable this feature forall architectures. So make it dependent on whetherCONFIG_HAVE_ARCH_PREL32_RELOCATIONS is defined.Link: http://lkml.kernel.org/r/20180704083651.24360-4-ard.biesheuvel@linaro.orgSigned-off-by: Ard Biesheuvel Acked-by: Jessica Yu Acked-by: Michael Ellerman Reviewed-by: Will Deacon Acked-by: Ingo Molnar Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Bjorn Helgaas Cc: Catalin Marinas Cc: James Morris Cc: James Morris Cc: Josh Poimboeuf Cc: Kees Cook Cc: Nicolas Pitre Cc: Paul Mackerras Cc: Petr Mladek Cc: Russell King Cc: "Serge E. Hallyn" Cc: Sergey Senozhatsky Cc: Steven Rostedt Cc: Thomas Garnier Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/arch/x86/include/asm/Kbuild

e0af0c16 - arch: Remove clkdev.h asm-generic from Kbuild

Tue, 02 Jan 2018 23:50:06 +0000

arch: Remove clkdev.h asm-generic from KbuildNow that every architecture is using the generic clkdev.h fileand we no longer include asm/clkdev.h anywhere in the tree, wecan remove it.Cc: Russell King Acked-by: Arnd Bergmann Cc: Acked-by: Geert Uytterhoeven [m68k]Signed-off-by: Stephen Boyd List of files: /linux-6.15/arch/x86/include/asm/Kbuild

b672592f - sched/cputime: Remove generic asm headers

Tue, 31 Jan 2017 03:09:51 +0000

sched/cputime: Remove generic asm headerscputime_t is now only used by two architectures: * powerpc (when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y) * s390And since the core doesn't use it anymore, we don't need any arch supportfrom the others. So we can remove their stub implementations.A final cleanup would be to provide an efficient pure archimplementation of cputime_to_nsec() for s390 and powerpc and finallyremove include/linux/cputime.h .Signed-off-by: Frederic Weisbecker Cc: Benjamin Herrenschmidt Cc: Fenghua Yu Cc: Heiko Carstens Cc: Linus Torvalds Cc: Martin Schwidefsky Cc: Michael Ellerman Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Rik van Riel Cc: Stanislaw Gruszka Cc: Thomas Gleixner Cc: Tony Luck Cc: Wanpeng Li Link: http://lkml.kernel.org/r/1485832191-26889-36-git-send-email-fweisbec@gmail.comSigned-off-by: Ingo Molnar List of files: /linux-6.15/arch/x86/include/asm/Kbuild

9190e217 - x86/build: Remove three unneeded genhdr-y entries

Fri, 25 Nov 2016 12:41:47 +0000

x86/build: Remove three unneeded genhdr-y entriesIn x86's include/asm/Kbuild three entries are appended to the genhdr-y makevariable: genhdr-y += unistd_32.h genhdr-y += unistd_64.h genhdr-y += unistd_x32.hThe same entries are also appended to that variable ininclude/uapi/asm/Kbuild. So commit: 10b63956fce7 ("UAPI: Plumb the UAPI Kbuilds into the user header installation and checking")... removed these three entries from include/asm/Kbuild. But, apparently, somemerge conflict resolution re-added them.The net effect is, in short, that the genhdr-y make variable contains thesefile names twice and, as a consequence, that the corresponding headers getinstalled twice. And so the build prints: INSTALL usr/include/asm/ (65 files)... while in reality only 62 files are installed in that directory.Nothing breaks because of all that, but it's a good idea to finally removethese unneeded entries nevertheless.Signed-off-by: Paul Bolle Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1480077707-2837-1-git-send-email-pebolle@tiscali.nlSigned-off-by: Ingo Molnar List of files: /linux-6.15/arch/x86/include/asm/Kbuild

54b880ca - kbuild, x86: Track generated headers with generated-y

Fri, 24 Jun 2016 22:42:23 +0000

kbuild, x86: Track generated headers with generated-yTrack generated header files which aren't already in genhdr-y, alongsidegeneric-y wrappers in the */include/generated/[uapi/]asm/ directories.Currently only x86 generates extra headers in these directories, for thepurposes of enumerating system calls for different ABIs, and xenhypercalls.This will allow the asm-generic wrapper handling code to remove stalewrappers when files are removed from generic-y, without also removingthese headers which are generated separately.Reported-by: kbuild test robot Signed-off-by: James Hogan Acked-by: Arnd Bergmann Cc: Jonathan Corbet Cc: linux-kbuild@vger.kernel.orgCc: linux-doc@vger.kernel.orgCc: Michal Marek Link: http://lkml.kernel.org/r/1466808144-23209-2-git-send-email-james.hogan@imgtec.comSigned-off-by: Thomas Gleixner List of files: /linux-6.15/arch/x86/include/asm/Kbuild

f2abeef9 - mm: clean up per architecture MM hook header files

Fri, 17 Jul 2015 23:23:58 +0000

mm: clean up per architecture MM hook header filesCommit 2ae416b142b6 ("mm: new mm hook framework") introduced an emptyheader file (mm-arch-hooks.h) for every architecture, even those whichdoesn't need to define mm hooks.As suggested by Geert Uytterhoeven, this could be cleaned through the useof a generic header file included via each per architectureasm/include/Kbuild file.The PowerPC architecture is not impacted here since this architecture hasto defined the arch_remap MM hook.Signed-off-by: Laurent Dufour Suggested-by: Geert Uytterhoeven Acked-by: Geert Uytterhoeven Acked-by: Vineet Gupta Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/arch/x86/include/asm/Kbuild

c546d5db - remove scatterlist.h generation from arch Kbuild files

Tue, 19 May 2015 06:36:29 +0000

remove scatterlist.h generation from arch Kbuild filesSigned-off-by: Christoph Hellwig Reported-by: Geert Uytterhoeven Signed-off-by: Jens Axboe List of files: /linux-6.15/arch/x86/include/asm/Kbuild

8057b308 - x86: use generic dma-contiguous.h

Wed, 16 Jul 2014 15:51:31 +0000

x86: use generic dma-contiguous.hdma-contiguous.h is now in asm-generic. Use that to avoid coderepetition in x86.Signed-off-by: Zubair Lutfullah Kakakhel Acked-by: Michal Nazarewicz Cc: catalin.marinas@arm.comCc: will.deacon@arm.comCc: tglx@linutronix.deCc: mingo@redhat.comCc: hpa@zytor.comCc: arnd@arndb.deCc: gregkh@linuxfoundation.orgCc: m.szyprowski@samsung.comCc: x86@kernel.orgCc: linux-arm-kernel@lists.infradead.orgCc: linux-kernel@vger.kernel.orgCc: linux-mips@linux-mips.orgCc: linux-arch@vger.kernel.orgPatchwork: https://patchwork.linux-mips.org/patch/7359/Signed-off-by: Ralf Baechle List of files: /linux-6.15/arch/x86/include/asm/Kbuild

3010279f - x86: Tell irq work about self IPI support

Sat, 16 Aug 2014 16:47:15 +0000

x86: Tell irq work about self IPI supportx86 supports irq work self-IPIs when local apic is available. This ispartly known on runtime so lets implement arch_irq_work_has_interrupt()accordingly.This should be safely called after setup_arch().Acked-by: Peter Zijlstra (Intel) Cc: Ingo Molnar Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Frederic Weisbecker List of files: /linux-6.15/arch/x86/include/asm/Kbuild

c5c38ef3 - irq_work: Introduce arch_irq_work_has_interrupt()

Sat, 06 Sep 2014 13:43:02 +0000

irq_work: Introduce arch_irq_work_has_interrupt()The nohz full code needs irq work to trigger its own interrupt so thatthe subsystem can work even when the tick is stopped.Lets introduce arch_irq_work_has_interrupt() that archs can override totell about their support for this ability.Signed-off-by: Peter Zijlstra Cc: Ingo Molnar Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Frederic Weisbecker List of files: /linux-6.15/arch/x86/include/asm/Kbuild