Changes in Kconfig

86ad6489e38c76c06c0b4a4229391a794023b5e0 - ARC: cleanup dead ARC_CANT_LLSC option in Kconfig

Sun, 16 Aug 2026 16:22:07 +0200

ARC: cleanup dead ARC_CANT_LLSC option in KconfigCurrently, the ARC_CANT_LLSC config option can never be enabled.It is also not referenced anywhere else. So let's remove this dead code.Note that I have only compile-tested these changes, because I do not havethe hardware to runtime test.This dead code was found by kconfirm, a static analysis tool for Kconfig.Signed-off-by: Julian Braha Signed-off-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

b4171fd0b091072f403b66bf05d01051d4bd94d9 - ARC: Always use SWAPE instructions for __arch_swab32()

Wed, 14 Jan 2026 08:28:13 +0100

ARC: Always use SWAPE instructions for __arch_swab32()Since commit 67a697e7576 ("ARC: retire ARC750 support") all supportedCPUs have the 'swape' instruction.Always use the implementation of __arch_swabe() which uses 'swape'.ARCH_USE_BUILTIN_BSWAP can not be used as that results on libcalls on-mcpu=arc700.As as side-effect, remove a leak of an internal kconfig symbol throughthe UAPI headers.Suggested-by: Arnd Bergmann Link: https://lore.kernel.org/lkml/0ae2688a-5a22-405b-adaf-9b5ad712b245@app.fastmail.com/Suggested-by: Vineet Gupta Link: https://lore.kernel.org/lkml/a033a402-e3c5-4982-9fff-b6a4c55817ae@kernel.org/Signed-off-by: Thomas Weißschuh Signed-off-by: Arnd Bergmann List of files: /linux/arch/arc/Kconfig

fd8c09ad0d87783b9b6a27900d66293be45b7bad - Merge tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Fri, 31 Jan 2025 21:07:07 +0100

Merge tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildPull Kbuild updates from Masahiro Yamada: - Support multiple hook locations for maint scripts of Debian package - Remove 'cpio' from the build tool requirement - Introduce gendwarfksyms tool, which computes CRCs for export symbols based on the DWARF information - Support CONFIG_MODVERSIONS for Rust - Resolve all conflicts in the genksyms parser - Fix several syntax errors in genksyms* tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (64 commits) kbuild: fix Clang LTO with CONFIG_OBJTOOL=n kbuild: Strip runtime const RELA sections correctly kconfig: fix memory leak in sym_warn_unmet_dep() kconfig: fix file name in warnings when loading KCONFIG_DEFCONFIG_LIST genksyms: fix syntax error for attribute before init-declarator genksyms: fix syntax error for builtin (u)int*x*_t types genksyms: fix syntax error for attribute after 'union' genksyms: fix syntax error for attribute after 'struct' genksyms: fix syntax error for attribute after abstact_declarator genksyms: fix syntax error for attribute before nested_declarator genksyms: fix syntax error for attribute before abstract_declarator genksyms: decouple ATTRIBUTE_PHRASE from type-qualifier genksyms: record attributes consistently for init-declarator genksyms: restrict direct-declarator to take one parameter-type-list genksyms: restrict direct-abstract-declarator to take one parameter-type-list genksyms: remove Makefile hack genksyms: fix last 3 shift/reduce conflicts genksyms: fix 6 shift/reduce conflicts and 5 reduce/reduce conflicts genksyms: reduce type_qualifier directly to decl_specifier genksyms: rename cvar_qualifier to type_qualifier ... List of files: /linux/arch/arc/Kconfig

4c551165e771ff565bf6c3b13e06a587e70acdef - Merge tag 'irq-core-2025-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 21 Jan 2025 22:51:07 +0100

Merge tag 'irq-core-2025-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull interrupt subsystem updates from Thomas Gleixner: - Consolidate the machine_kexec_mask_interrupts() by providing a generic implementation and replacing the copy & pasta orgy in the relevant architectures. - Prevent unconditional operations on interrupt chips during kexec shutdown, which can trigger warnings in certain cases when the underlying interrupt has been shut down before. - Make the enforcement of interrupt handling in interrupt context unconditionally available, so that it actually works for non x86 related interrupt chips. The earlier enablement for ARM GIC chips set the required chip flag, but did not notice that the check was hidden behind a config switch which is not selected by ARM[64]. - Decrapify the handling of deferred interrupt affinity setting. Some interrupt chips require that affinity changes are made from the context of handling an interrupt to avoid certain race conditions. For x86 this was the default, but with interrupt remapping this requirement was lifted and a flag was introduced which tells the core code that affinity changes can be done in any context. Unrestricted affinity changes are the default for the majority of interrupt chips. RISCV has the requirement to add the deferred mode to one of it's interrupt controllers, but with the original implementation this would require to add the any context flag to all other RISC-V interrupt chips. That's backwards, so reverse the logic and require that chips, which need the deferred mode have to be marked accordingly. That avoids chasing the 'sane' chips and marking them. - Add multi-node support to the Loongarch AVEC interrupt controller driver. - The usual tiny cleanups, fixes and improvements all over the place.* tag 'irq-core-2025-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq/generic_chip: Export irq_gc_mask_disable_and_ack_set() genirq/timings: Add kernel-doc for a function parameter genirq: Remove IRQ_MOVE_PCNTXT and related code x86/apic: Convert to IRQCHIP_MOVE_DEFERRED genirq: Provide IRQCHIP_MOVE_DEFERRED hexagon: Remove GENERIC_PENDING_IRQ leftover ARC: Remove GENERIC_PENDING_IRQ genirq: Remove handle_enforce_irqctx() wrapper genirq: Make handle_enforce_irqctx() unconditionally available irqchip/loongarch-avec: Add multi-nodes topology support irqchip/ts4800: Replace seq_printf() by seq_puts() irqchip/ti-sci-inta : Add module build support irqchip/ti-sci-intr: Add module build support irqchip/irq-brcmstb-l2: Replace brcmstb_l2_mask_and_ack() by generic function irqchip: keystone: Use syscon_regmap_lookup_by_phandle_args genirq/kexec: Prevent redundant IRQ masking by checking state before shutdown kexec: Consolidate machine_kexec_mask_interrupts() implementation genirq: Reuse irq_thread_fn() for forced thread case genirq: Move irq_thread_fn() further up in the code List of files: /linux/arch/arc/Kconfig

3b7f793acc13b6108452271b306d4aa94a3c4940 - ARC: migrate to the generic rule for built-in DTB

Sun, 22 Dec 2024 01:15:00 +0100

ARC: migrate to the generic rule for built-in DTBCommit 654102df2ac2 ("kbuild: add generic support for built-in bootDTBs") introduced generic support for built-in DTBs.Select GENERIC_BUILTIN_DTB to use the generic rule.To keep consistency across architectures, this commit also renamesCONFIG_ARC_BUILTIN_DTB_NAME to CONFIG_BUILTIN_DTB_NAME.Now, "nsim_700" is the default value for CONFIG_BUILTIN_DTB_NAME, ratherthan a fallback in case it is empty.Acked-by: Vineet Gupta Signed-off-by: Masahiro Yamada List of files: /linux/arch/arc/Kconfig

5d30d6ab8c65b6caf034892aa8ae29285d0a515f - ARC: Remove GENERIC_PENDING_IRQ

Tue, 10 Dec 2024 11:34:10 +0100

ARC: Remove GENERIC_PENDING_IRQNothing uses the actual functionality and the MCIP controller sets theflags which disables the deferred affinity change. The other interruptcontroller does not support affinity setting at all.Signed-off-by: Thomas Gleixner Acked-by: Vineet Gupta # arch/arc/Link: https://lore.kernel.org/all/20241210103335.373392568@linutronix.de List of files: /linux/arch/arc/Kconfig

5c0541e11c16bd2f162e23a22d07c09d58017e5a - mm: introduce cpu_icache_is_aliasing() across all architectures

Mon, 09 Dec 2024 19:23:25 +0100

mm: introduce cpu_icache_is_aliasing() across all architecturesIn commit eacd0e950dc2 ("ARC: [mm] Lazy D-cache flush (non aliasingVIPT)"), arc adds the need to flush dcache to make icache see the codepage change. This also requires special handling forclear_user_(high)page(). Introduce cpu_icache_is_aliasing() to make MMcode query special clear_user_(high)page() easier. This will be used bythe following commit.Link: https://lkml.kernel.org/r/20241209182326.2955963-1-ziy@nvidia.comFixes: 5708d96da20b ("mm: avoid zeroing user movable page twice with init_on_alloc=1")Signed-off-by: Zi Yan Suggested-by: Mathieu Desnoyers Reviewed-by: Mathieu Desnoyers Acked-by: Vlastimil Babka Cc: Alexander Potapenko Cc: David Hildenbrand Cc: Geert Uytterhoeven Cc: John Hubbard Cc: Kees Cook Cc: Kefeng Wang Cc: Matthew Wilcox Cc: Miaohe Lin Cc: Ryan Roberts Cc: Vineet Gupta Signed-off-by: Andrew Morton List of files: /linux/arch/arc/Kconfig

dd2b2302efffab751d1c2d9a436365db0ee55a42 - ARC: fix reference of dependency for PAE40 config

Mon, 28 Oct 2024 10:59:07 +0100

ARC: fix reference of dependency for PAE40 configCommit d71e629bed5b ("ARC: build: disallow invalid PAE40 + 4K page config")reworks the build dependencies for ARC_HAS_PAE40, and accidentally refersto the non-existing config option MMU_V4 rather than the intended optionARC_MMU_V4. Note the missing prefix in the name here.Refer to the intended config option in the dependency of the ARC_HAS_PAE40config.Fixes: d71e629bed5b ("ARC: build: disallow invalid PAE40 + 4K page config")Signed-off-by: Lukas Bulwahn Signed-off-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

8871331b1769978ecece205a430338a2581e5050 - ARC: build: disallow invalid PAE40 + 4K page config

Wed, 09 Oct 2024 19:33:22 +0200

ARC: build: disallow invalid PAE40 + 4K page configThe config option being built was| CONFIG_ARC_MMU_V4=y| CONFIG_ARC_PAGE_SIZE_4K=y| CONFIG_HIGHMEM=y| CONFIG_ARC_HAS_PAE40=yThis was hitting a BUILD_BUG_ON() since a 4K page can't hoist 1k, 8-bytePTE entries (8 byte due to PAE40). BUILD_BUG_ON() is a good last ditchresort, but such a config needs to be disallowed explicitly in Kconfig.Side-note: the actual fix is single liner dependency, but while at itcleaned out a few things: - 4K dependency on MMU v3 or v4 is always true, since 288ff7de62af09 ("ARC: retire MMUv1 and MMUv2 support") - PAE40 dependency in on MMU ver not really ISA, although that follows eventually.Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202409160223.xydgucbY-lkp@intel.com/Signed-off-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

68e5c7d4cefb66de3953a874e670ec8f1ce86a24 - Merge tag 'kbuild-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Tue, 24 Sep 2024 22:02:06 +0200

Merge tag 'kbuild-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildPull Kbuild updates from Masahiro Yamada: - Support cross-compiling linux-headers Debian package and kernel-devel RPM package - Add support for the linux-debug Pacman package - Improve module rebuilding speed by factoring out the common code to scripts/module-common.c - Separate device tree build rules into scripts/Makefile.dtbs - Add a new script to generate modules.builtin.ranges, which is useful for tracing tools to find symbols in built-in modules - Refactor Kconfig and misc tools - Update Kbuild and Kconfig documentation* tag 'kbuild-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (51 commits) kbuild: doc: replace "gcc" in external module description kbuild: doc: describe the -C option precisely for external module builds kbuild: doc: remove the description about shipped files kbuild: doc: drop section numbering, use references in modules.rst kbuild: doc: throw out the local table of contents in modules.rst kbuild: doc: remove outdated description of the limitation on -I usage kbuild: doc: remove description about grepping CONFIG options kbuild: doc: update the description about Kbuild/Makefile split kbuild: remove unnecessary export of RUST_LIB_SRC kbuild: remove append operation on cmd_ld_ko_o kconfig: cache expression values kconfig: use hash table to reuse expressions kconfig: refactor expr_eliminate_dups() kconfig: add comments to expression transformations kconfig: change some expr_*() functions to bool scripts: move hash function from scripts/kconfig/ to scripts/include/ kallsyms: change overflow variable to bool type kallsyms: squash output_address() kbuild: add install target for modules.builtin.ranges scripts: add verifier script for builtin module range data ... List of files: /linux/arch/arc/Kconfig

f2519d4d4fc4d36f2b58c5614357de9f5b4032fc - ARC: Emulate one-byte cmpxchg

Mon, 18 Mar 2024 09:27:35 +0100

ARC: Emulate one-byte cmpxchgUse the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on arc.[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ][ paulmck: Apply feedback from Naresh Kamboju. ][ paulmck: Apply kernel test robot feedback. ][ paulmck: Apply feedback from Vineet Gupta. ]Signed-off-by: Paul E. McKenney Cc: Andi Shyti Cc: Andrzej Hajda Cc: Arnd Bergmann Cc: Palmer Dabbelt Cc: Acked-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

cd615d7fcc7958107d1506c6eb5be50f4e920312 - ARC: update the help message for CONFIG_ARC_BUILTIN_DTB_NAME

Sat, 31 Aug 2024 12:10:28 +0200

ARC: update the help message for CONFIG_ARC_BUILTIN_DTB_NAMECommit abe11ddea1d7 ("ARC: [plat-arcfpga]: Enabling DeviceTree forAngel4 board") changed the default built-in DTB from "skeleton" to"angel4".Commit fd1557923b2e ("ARC: [plat_arcfpga]->[plat_sim]") changed itfrom "angel4" to "nsim_700".Signed-off-by: Masahiro Yamada Acked-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

6e62702feb6d474e969b52f0379de93e9729e457 - Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Tue, 14 May 2024 01:40:22 +0200

Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextDaniel Borkmann says:====================pull-request: bpf-next 2024-05-13We've added 119 non-merge commits during the last 14 day(s) which containa total of 134 files changed, 9462 insertions(+), 4742 deletions(-).The main changes are:1) Add BPF JIT support for 32-bit ARCv2 processors, from Shahab Vahedi.2) Add BPF range computation improvements to the verifier in particular around XOR and OR operators, refactoring of checks for range computation and relaxing MUL range computation so that src_reg can also be an unknown scalar, from Cupertino Miranda.3) Add support to attach kprobe BPF programs through kprobe_multi link in a session mode, meaning, a BPF program is attached to both function entry and return, the entry program can decide if the return program gets executed and the entry program can share u64 cookie value with return program. Session mode is a common use-case for tetragon and bpftrace, from Jiri Olsa.4) Fix a potential overflow in libbpf's ring__consume_n() and improve libbpf as well as BPF selftest's struct_ops handling, from Andrii Nakryiko.5) Improvements to BPF selftests in context of BPF gcc backend, from Jose E. Marchesi & David Faust.6) Migrate remaining BPF selftest tests from test_sock_addr.c to prog_test- -style in order to retire the old test, run it in BPF CI and additionally expand test coverage, from Jordan Rife.7) Big batch for BPF selftest refactoring in order to remove duplicate code around common network helpers, from Geliang Tang.8) Another batch of improvements to BPF selftests to retire obsolete bpf_tcp_helpers.h as everything is available vmlinux.h, from Martin KaFai Lau.9) Fix BPF map tear-down to not walk the map twice on free when both timer and wq is used, from Benjamin Tissoires.10) Fix BPF verifier assumptions about socket->sk that it can be non-NULL, from Alexei Starovoitov.11) Change BTF build scripts to using --btf_features for pahole v1.26+, from Alan Maguire.12) Small improvements to BPF reusing struct_size() and krealloc_array(), from Andy Shevchenko.13) Fix s390 JIT to emit a barrier for BPF_FETCH instructions, from Ilya Leoshkevich.14) Extend TCP ->cong_control() callback in order to feed in ack and flag parameters and allow write-access to tp->snd_cwnd_stamp from BPF program, from Miao Xu.15) Add support for internal-only per-CPU instructions to inline bpf_get_smp_processor_id() helper call for arm64 and riscv64 BPF JITs, from Puranjay Mohan.16) Follow-up to remove the redundant ethtool.h from tooling infrastructure, from Tushar Vyavahare.17) Extend libbpf to support "module:" syntax for tracing programs, from Viktor Malik.* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (119 commits) bpf: make list_for_each_entry portable bpf: ignore expected GCC warning in test_global_func10.c bpf: disable strict aliasing in test_global_func9.c selftests/bpf: Free strdup memory in xdp_hw_metadata selftests/bpf: Fix a few tests for GCC related warnings. bpf: avoid gcc overflow warning in test_xdp_vlan.c tools: remove redundant ethtool.h from tooling infra selftests/bpf: Expand ATTACH_REJECT tests selftests/bpf: Expand getsockname and getpeername tests sefltests/bpf: Expand sockaddr hook deny tests selftests/bpf: Expand sockaddr program return value tests selftests/bpf: Retire test_sock_addr.(c|sh) selftests/bpf: Remove redundant sendmsg test cases selftests/bpf: Migrate ATTACH_REJECT test cases selftests/bpf: Migrate expected_attach_type tests selftests/bpf: Migrate wildcard destination rewrite test selftests/bpf: Migrate sendmsg6 v4 mapped address tests selftests/bpf: Migrate sendmsg deny test cases selftests/bpf: Migrate WILDCARD_IP test selftests/bpf: Handle SYSCALL_EPERM and SYSCALL_ENOTSUPP test cases ...====================Link: https://lore.kernel.org/r/20240513134114.17575-1-daniel@iogearbox.netSigned-off-by: Jakub Kicinski List of files: /linux/arch/arc/Kconfig

f122668ddcce450c2585f0be4bf4478d6fd6176b - ARC: Add eBPF JIT support

Tue, 30 Apr 2024 16:56:04 +0200

ARC: Add eBPF JIT supportThis will add eBPF JIT support to the 32-bit ARCv2 processors. Theimplementation is qualified by running the BPF tests on a Synopsys HSDKboard with "ARC HS38 v2.1c at 500 MHz" as the 4-core CPU.The test_bpf.ko reports 2-10 fold improvements in execution time of itstests. For instance:test_bpf: #33 tcpdump port 22 jited:0 704 1766 2104 PASStest_bpf: #33 tcpdump port 22 jited:1 120 224 260 PASStest_bpf: #141 ALU_DIV_X: 4294967295 / 4294967295 = 1 jited:0 238 PASStest_bpf: #141 ALU_DIV_X: 4294967295 / 4294967295 = 1 jited:1 23 PASStest_bpf: #776 JMP32_JGE_K: all ... magnitudes jited:0 2034681 PASStest_bpf: #776 JMP32_JGE_K: all ... magnitudes jited:1 1020022 PASSDeployment and structure------------------------The related codes are added to "arch/arc/net":- bpf_jit.h -- The interface that a back-end translator must provide- bpf_jit_core.c -- Knows how to handle the input eBPF byte stream- bpf_jit_arcv2.c -- The back-end code that knows the translation logicThe bpf_int_jit_compile() at the end of bpf_jit_core.c is the entranceto the whole process. Normally, the translation is done in one pass,namely the "normal pass". In case some relocations are not known duringthis pass, some data (arc_jit_data) is allocated for the next pass tocome. This possible next (and last) pass is called the "extra pass".1. Normal pass # The necessary pass 1a. Dry run # Get the whole JIT length, epilogue offset, etc. 1b. Emit phase # Allocate memory and start emitting instructions2. Extra pass # Only needed if there are relocations to be fixed 2a. Patch relocationsSupport status--------------The JIT compiler supports BPF instructions up to "cpu=v4". However, itdoes not yet provide support for:- Tail calls- Atomic operations- 64-bit division/remainder- BPF_PROBE_MEM* (exception table)The result of "test_bpf" test suite on an HSDK board is:hsdk-lnx# insmod test_bpf.ko test_suite=test_bpf test_bpf: Summary: 863 PASSED, 186 FAILED, [851/851 JIT'ed]All the failing test cases are due to the ones that were not JIT'ed.Categorically, they can be represented as: .-----------.------------.-------------. | test type | opcodes | # of cases | |-----------+------------+-------------| | atomic | 0xC3, 0xDB | 149 | | div64 | 0x37, 0x3F | 22 | | mod64 | 0x97, 0x9F | 15 | `-----------^------------+-------------| | (total) 186 | `-------------'Setup: build config-------------------The following configs must be set to have a working JIT test: CONFIG_BPF_JIT=y CONFIG_BPF_JIT_ALWAYS_ON=y CONFIG_TEST_BPF=mThe following options are not necessary for the tests module,but are good to have: CONFIG_DEBUG_INFO=y # prerequisite for below CONFIG_DEBUG_INFO_BTF=y # so bpftool can generate vmlinux.h CONFIG_FTRACE=y # CONFIG_BPF_SYSCALL=y # all these options lead to CONFIG_KPROBE_EVENTS=y # having CONFIG_BPF_EVENTS=y CONFIG_PERF_EVENTS=y #Some BPF programs provide data through /sys/kernel/debug: CONFIG_DEBUG_FS=yarc# mount -t debugfs debugfs /sys/kernel/debugSetup: elfutils---------------The libdw.{so,a} library that is used by pahole for processingthe final binary must come from elfutils 0.189 or newer. Thesupport for ARCv2 [1] has been added since that version.[1]https://sourceware.org/git/?p=elfutils.git;a=commit;h=de3d46b3e7Setup: pahole-------------The line below in linux/scripts/Makefile.btf must be commented out:pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floatsOr else, the build will fail:$ make V=1 ... BTF .btf.vmlinux.bin.opahole -J --btf_gen_floats \ -j --lang_exclude=rust \ --skip_encoding_btf_inconsistent_proto \ --btf_gen_optimized .tmp_vmlinux.btfComplex, interval and imaginary float types are not supportedEncountered error while encoding BTF. ... BTFIDS vmlinux./tools/bpf/resolve_btfids/resolve_btfids vmlinuxlibbpf: failed to find '.BTF' ELF section in vmlinuxFAILED: load BTF from vmlinux: No data availableThis is due to the fact that the ARC toolchains generate"complex float" DIE entries in libgcc and at the moment, paholecan't handle such entries.Running the tests-----------------host$ scp /bld/linux/lib/test_bpf.ko arc:arc # sysctl net.core.bpf_jit_enable=1arc # insmod test_bpf.ko test_suite=test_bpf ... test_bpf: #1048 Staggered jumps: JMP32_JSLE_X jited:1 697811 PASS test_bpf: Summary: 863 PASSED, 186 FAILED, [851/851 JIT'ed]Acknowledgments---------------- Claudiu Zissulescu for his unwavering support- Yuriy Kolerov for testing and troubleshooting- Vladimir Isaev for the pahole workaround- Sergey Matyukevich for paving the road by adding the interpreter supportSigned-off-by: Shahab Vahedi Link: https://lore.kernel.org/r/20240430145604.38592-1-list+bpf@vahedi.orgSigned-off-by: Alexei Starovoitov List of files: /linux/arch/arc/Kconfig

d5272aaa8257920c7b398f953ada65e25c248f9a - ARC: mm: fix new code about cache aliasing

Thu, 28 Mar 2024 06:19:25 +0100

ARC: mm: fix new code about cache aliasingManual/partial revert of 8690bbcf3b70 ("Introduce cpu_dcache_is_aliasing() across all architectures")Current generation of ARCv2/ARCv3 based HSxx cores are only PIPT (to softwareat least).Legacy ARC700 cpus could be VIPT aliasing (based on cache geometry andPAGE_SIZE) [1] however recently that support was ripped out so VIPT aliasingcache is not relevant to ARC anymore.[1] http://lists.infradead.org/pipermail/linux-snps-arc/2023-February/006899.htmlAcked-by: Mathieu Desnoyers Signed-off-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

902861e34c401696ed9ad17a54c8790e7e8e3069 - Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Fri, 15 Mar 2024 01:43:30 +0100

Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmPull MM updates from Andrew Morton: - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames from hotplugged memory rather than only from main memory. Series "implement "memmap on memory" feature on s390". - More folio conversions from Matthew Wilcox in the series "Convert memcontrol charge moving to use folios" "mm: convert mm counter to take a folio" - Chengming Zhou has optimized zswap's rbtree locking, providing significant reductions in system time and modest but measurable reductions in overall runtimes. The series is "mm/zswap: optimize the scalability of zswap rb-tree". - Chengming Zhou has also provided the series "mm/zswap: optimize zswap lru list" which provides measurable runtime benefits in some swap-intensive situations. - And Chengming Zhou further optimizes zswap in the series "mm/zswap: optimize for dynamic zswap_pools". Measured improvements are modest. - zswap cleanups and simplifications from Yosry Ahmed in the series "mm: zswap: simplify zswap_swapoff()". - In the series "Add DAX ABI for memmap_on_memory", Vishal Verma has contributed several DAX cleanups as well as adding a sysfs tunable to control the memmap_on_memory setting when the dax device is hotplugged as system memory. - Johannes Weiner has added the large series "mm: zswap: cleanups", which does that. - More DAMON work from SeongJae Park in the series "mm/damon: make DAMON debugfs interface deprecation unignorable" "selftests/damon: add more tests for core functionalities and corner cases" "Docs/mm/damon: misc readability improvements" "mm/damon: let DAMOS feeds and tame/auto-tune itself" - In the series "mm/mempolicy: weighted interleave mempolicy and sysfs extension" Rakie Kim has developed a new mempolicy interleaving policy wherein we allocate memory across nodes in a weighted fashion rather than uniformly. This is beneficial in heterogeneous memory environments appearing with CXL. - Christophe Leroy has contributed some cleanup and consolidation work against the ARM pagetable dumping code in the series "mm: ptdump: Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute". - Luis Chamberlain has added some additional xarray selftesting in the series "test_xarray: advanced API multi-index tests". - Muhammad Usama Anjum has reworked the selftest code to make its human-readable output conform to the TAP ("Test Anything Protocol") format. Amongst other things, this opens up the use of third-party tools to parse and process out selftesting results. - Ryan Roberts has added fork()-time PTE batching of THP ptes in the series "mm/memory: optimize fork() with PTE-mapped THP". Mainly targeted at arm64, this significantly speeds up fork() when the process has a large number of pte-mapped folios. - David Hildenbrand also gets in on the THP pte batching game in his series "mm/memory: optimize unmap/zap with PTE-mapped THP". It implements batching during munmap() and other pte teardown situations. The microbenchmark improvements are nice. - And in the series "Transparent Contiguous PTEs for User Mappings" Ryan Roberts further utilizes arm's pte's contiguous bit ("contpte mappings"). Kernel build times on arm64 improved nicely. Ryan's series "Address some contpte nits" provides some followup work. - In the series "mm/hugetlb: Restore the reservation" Breno Leitao has fixed an obscure hugetlb race which was causing unnecessary page faults. He has also added a reproducer under the selftest code. - In the series "selftests/mm: Output cleanups for the compaction test", Mark Brown did what the title claims. - Kinsey Ho has added the series "mm/mglru: code cleanup and refactoring". - Even more zswap material from Nhat Pham. The series "fix and extend zswap kselftests" does as claimed. - In the series "Introduce cpu_dcache_is_aliasing() to fix DAX regression" Mathieu Desnoyers has cleaned up and fixed rather a mess in our handling of DAX on archiecctures which have virtually aliasing data caches. The arm architecture is the main beneficiary. - Lokesh Gidra's series "per-vma locks in userfaultfd" provides dramatic improvements in worst-case mmap_lock hold times during certain userfaultfd operations. - Some page_owner enhancements and maintenance work from Oscar Salvador in his series "page_owner: print stacks and their outstanding allocations" "page_owner: Fixup and cleanup" - Uladzislau Rezki has contributed some vmalloc scalability improvements in his series "Mitigate a vmap lock contention". It realizes a 12x improvement for a certain microbenchmark. - Some kexec/crash cleanup work from Baoquan He in the series "Split crash out from kexec and clean up related config items". - Some zsmalloc maintenance work from Chengming Zhou in the series "mm/zsmalloc: fix and optimize objects/page migration" "mm/zsmalloc: some cleanup for get/set_zspage_mapping()" - Zi Yan has taught the MM to perform compaction on folios larger than order=0. This a step along the path to implementaton of the merging of large anonymous folios. The series is named "Enable >0 order folio memory compaction". - Christoph Hellwig has done quite a lot of cleanup work in the pagecache writeback code in his series "convert write_cache_pages() to an iterator". - Some modest hugetlb cleanups and speedups in Vishal Moola's series "Handle hugetlb faults under the VMA lock". - Zi Yan has changed the page splitting code so we can split huge pages into sizes other than order-0 to better utilize large folios. The series is named "Split a folio to any lower order folios". - David Hildenbrand has contributed the series "mm: remove total_mapcount()", a cleanup. - Matthew Wilcox has sought to improve the performance of bulk memory freeing in his series "Rearrange batched folio freeing". - Gang Li's series "hugetlb: parallelize hugetlb page init on boot" provides large improvements in bootup times on large machines which are configured to use large numbers of hugetlb pages. - Matthew Wilcox's series "PageFlags cleanups" does that. - Qi Zheng's series "minor fixes and supplement for ptdesc" does that also. S390 is affected. - Cleanups to our pagemap utility functions from Peter Xu in his series "mm/treewide: Replace pXd_large() with pXd_leaf()". - Nico Pache has fixed a few things with our hugepage selftests in his series "selftests/mm: Improve Hugepage Test Handling in MM Selftests". - Also, of course, many singleton patches to many things. Please see the individual changelogs for details.* tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (435 commits) mm/zswap: remove the memcpy if acomp is not sleepable crypto: introduce: acomp_is_async to expose if comp drivers might sleep memtest: use {READ,WRITE}_ONCE in memory scanning mm: prohibit the last subpage from reusing the entire large folio mm: recover pud_leaf() definitions in nopmd case selftests/mm: skip the hugetlb-madvise tests on unmet hugepage requirements selftests/mm: skip uffd hugetlb tests with insufficient hugepages selftests/mm: dont fail testsuite due to a lack of hugepages mm/huge_memory: skip invalid debugfs new_order input for folio split mm/huge_memory: check new folio order when split a folio mm, vmscan: retry kswapd's priority loop with cache_trim_mode off on failure mm: add an explicit smp_wmb() to UFFDIO_CONTINUE mm: fix list corruption in put_pages_list mm: remove folio from deferred split list before uncharging it filemap: avoid unnecessary major faults in filemap_fault() mm,page_owner: drop unnecessary check mm,page_owner: check for null stack_record before bumping its refcount mm: swap: fix race between free_swap_and_cache() and swapoff() mm/treewide: align up pXd_leaf() retval across archs mm/treewide: drop pXd_large() ... List of files: /linux/arch/arc/Kconfig

d3e5bab923d35f73c74f6dbbb761988d4f58f878 - arch: simplify architecture specific page size configuration

Mon, 26 Feb 2024 17:14:12 +0100

arch: simplify architecture specific page size configurationarc, arm64, parisc and powerpc all have their own Kconfig symbolsin place of the common CONFIG_PAGE_SIZE_4KB symbols. Change theseso the common symbols are the ones that are actually used, whileleaving the arhcitecture specific ones as the user visibleplace for configuring it, to avoid breaking user configs.Reviewed-by: Christophe Leroy (powerpc32)Acked-by: Catalin Marinas Acked-by: Helge Deller # pariscReviewed-by: Thomas Gleixner Signed-off-by: Arnd Bergmann List of files: /linux/arch/arc/Kconfig

8690bbcf3b7010b31fdbf3851e1add6ae19b8624 - Introduce cpu_dcache_is_aliasing() across all architectures

Thu, 15 Feb 2024 15:46:32 +0100

Introduce cpu_dcache_is_aliasing() across all architecturesIntroduce a generic way to query whether the data cache is virtuallyaliased on all architectures. Its purpose is to ensure that subsystemswhich are incompatible with virtually aliased data caches (e.g. FS_DAX)can reliably query this.For data cache aliasing, there are three scenarios dependending on thearchitecture. Here is a breakdown based on my understanding:A) The data cache is always aliasing:* arc* csky* m68k (note: shared memory mappings are incoherent ? SHMLBA is missing there.)* sh* pariscB) The data cache aliasing is statically known or depends on querying CPU state at runtime:* arm (cache_is_vivt() || cache_is_vipt_aliasing())* mips (cpu_has_dc_aliases)* nios2 (NIOS2_DCACHE_SIZE > PAGE_SIZE)* sparc32 (vac_cache_size > PAGE_SIZE)* sparc64 (L1DCACHE_SIZE > PAGE_SIZE)* xtensa (DCACHE_WAY_SIZE > PAGE_SIZE)C) The data cache is never aliasing:* alpha* arm64 (aarch64)* hexagon* loongarch (but with incoherent write buffers, which are disabled since commit d23b7795 ("LoongArch: Change SHMLBA from SZ_64K to PAGE_SIZE"))* microblaze* openrisc* powerpc* riscv* s390* um* x86Require architectures in A) and B) to select ARCH_HAS_CPU_CACHE_ALIASING andimplement "cpu_dcache_is_aliasing()".Architectures in C) don't select ARCH_HAS_CPU_CACHE_ALIASING, and thuscpu_dcache_is_aliasing() simply evaluates to "false".Note that this leaves "cpu_icache_is_aliasing()" to be implemented as futurework. This would be useful to gate features like XIP on architectureswhich have aliasing CPU dcache-icache but not CPU dcache-dcache.Use "cpu_dcache" and "cpu_cache" rather than just "dcache" and "cache"to clarify that we really mean "CPU data cache" and "CPU cache" toeliminate any possible confusion with VFS "dentry cache" and "pagecache".Link: https://lore.kernel.org/lkml/20030910210416.GA24258@mail.jlokier.co.uk/Link: https://lkml.kernel.org/r/20240215144633.96437-9-mathieu.desnoyers@efficios.comFixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")Signed-off-by: Mathieu Desnoyers Cc: Dan Williams Cc: Vishal Verma Cc: Dave Jiang Cc: Matthew Wilcox Cc: Arnd Bergmann Cc: Russell King Cc: Alasdair Kergon Cc: Christoph Hellwig Cc: Dave Chinner Cc: Heiko Carstens Cc: kernel test robot Cc: Michael Sclafani Cc: Mike Snitzer Cc: Mikulas Patocka Signed-off-by: Andrew Morton List of files: /linux/arch/arc/Kconfig

6732c0e494ac35fbadd749bbbd226c0aceb2d2c4 - ARC: mm: retire support for aliasing VIPT D$

Thu, 16 Feb 2023 06:06:33 +0100

ARC: mm: retire support for aliasing VIPT D$Legacy ARC700 processors (first generation of MMU enabled ARC cores) hadVIPT cached which could be configured such that they could alias.Corresponding support in kernel (with all the obnoxious cache flush overhead)was added in ARC port 10 years ago to support 1 silicon. That is long bygoneand we can let it RIP.Cc: Matthew Wilcox (Oracle) Signed-off-by: Vineet Gupta List of files: /linux/arch/arc/Kconfig

3f86ed6ec0b390c033eae7f9c487a3fea268e027 - Merge tag 'arc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Tue, 05 Sep 2023 00:38:24 +0200

Merge tag 'arc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arcPull ARC updates from Vineet Gupta: - fixes for -Wmissing-prototype warnings - missing compiler barrier in relaxed atomics - some uaccess simplification, declutter - removal of massive glocal struct cpuinfo_arc from bootlog code - __switch_to consolidation (removal of inline asm variant) - use GP to cache task pointer (vs. r25) - misc rework of entry code* tag 'arc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (24 commits) ARC: boot log: fix warning arc: Explicitly include correct DT includes ARC: pt_regs: create seperate type for ecr ARCv2: entry: rearrange pt_regs slightly ARC: entry: replace 8 byte ADD.ne with 4 byte ADD2.ne ARC: entry: replace 8 byte OR with 4 byte BSET ARC: entry: Add more common chores to EXCEPTION_PROLOGUE ARC: entry: EV_MachineCheck dont re-read ECR ARC: entry: ARcompact EV_ProtV to use r10 directly ARC: entry: rework (non-functional) ARC: __switch_to: move ksp to thread_info from thread_struct ARC: __switch_to: asm with dwarf ops (vs. inline asm) ARC: kernel stack: INIT_THREAD need not setup @init_stack in @ksp ARC: entry: use gp to cache task pointer (vs. r25) ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA ARC: boot log: eliminate struct cpuinfo_arc #3: don't export ARC: boot log: eliminate struct cpuinfo_arc #2: cache ARC: boot log: eliminate struct cpuinfo_arc #1: mm ARCv2: memset: don't prefetch for len == 0 which happens a alot ARC: uaccess: elide unaliged handling if hardware supports ... List of files: /linux/arch/arc/Kconfig