Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C656C636D4 for ; Wed, 15 Feb 2023 16:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229676AbjBOQun (ORCPT ); Wed, 15 Feb 2023 11:50:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229872AbjBOQuh (ORCPT ); Wed, 15 Feb 2023 11:50:37 -0500 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C92D836473 for ; Wed, 15 Feb 2023 08:50:27 -0800 (PST) Received: by mail-pl1-x634.google.com with SMTP id d8so19583641plr.10 for ; Wed, 15 Feb 2023 08:50:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dabbelt-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:to:from:cc :in-reply-to:subject:date:from:to:cc:subject:date:message-id :reply-to; bh=zhx1yzdzVBg6+g7Twy0cJVO0YWzqPyepiFMWW3ZMvbg=; b=yrFvqtDJ8DnTiQp0nC3wJ/xatGwSNMAbVJsbDpaOWOuvbEG0TTBIIu91/6VagqePV2 BMsRTn4/6ICLIxdtZcLQpKoRyTTaeeSuufOth8HjRCWGNCQhk4HPXh9jOcQr5pUCoy6Z Ha8SFN47Pg6pXt/Ub9dDv+8X14mH0PYoURovGgUsBZ8261Zwxujd7Sd9DnWesP/sXkLg 8yAKnxGH45ofNyir5krH7iLyoPJaTcw2sO7DIvuC9u96Ev4pf2Q0m8sU2PEclgH/zc+v p2DsqvPJCPZCR2BRrtP6vAe/3Xsy4raIMPj4lFMuzjt35yD/j+oCtBtTCoPx9z82ZX50 ABkg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:to:from:cc :in-reply-to:subject:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=zhx1yzdzVBg6+g7Twy0cJVO0YWzqPyepiFMWW3ZMvbg=; b=ug54a6tMB96CWUyE7x3L03x7Rf86hvTI2/ScLH+EvsyGVRXi53xMi3xYD1sJ7cVTDP 9qmrw9ilOKRI0JeeVpSPNtog3eoe3DgxSHaxkZyYPeLGyTCk5w11JmHuDgz9RZwpV7v3 als9DNPBOm/hkr15r/56Y53q9/81wXGIXlTFRivvyKkx3deUHOX18Qmg5DnyH9L2ePhs ucouZkpCqRNfHcmm8529AqNswkM7jbvQRZ6gzpUqzepgCPZW84h8g+mGQOdJ8kSU2Fsp 8I/U0oNHXFmy85YmpnrrDoA04AINhuGcNhe7Yd3ep8xpSAWESveo6iRuhCZWN44wS2Gr s/SQ== X-Gm-Message-State: AO0yUKW68ga7n9wWfAOZF2BiWDxpHw/P3CeyKV3c5RPfmVIFkjQfzeNb UDAvVwqZuhLrCu2Iaypi7cYB9oG+z8/R0fjowGw= X-Google-Smtp-Source: AK7set/v0vROca/042lxcT6HFP5kms+0m5w9fV7oTDKajtZ3Q30Tp8ogqRLnha7dSZJZGkmUHvHsjA== X-Received: by 2002:a17:902:d503:b0:19a:a9d8:e47f with SMTP id b3-20020a170902d50300b0019aa9d8e47fmr4216201plg.36.1676479826674; Wed, 15 Feb 2023 08:50:26 -0800 (PST) Received: from localhost ([135.180.226.51]) by smtp.gmail.com with ESMTPSA id jh19-20020a170903329300b0019abb539cddsm3304276plb.10.2023.02.15.08.50.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Feb 2023 08:50:26 -0800 (PST) Date: Wed, 15 Feb 2023 08:50:26 -0800 (PST) X-Google-Original-Date: Wed, 15 Feb 2023 08:50:22 PST (-0800) Subject: Re: [RFC PATCH 0/5] Retire IA64/Itanium support In-Reply-To: <20230215100008.2565237-1-ardb@kernel.org> CC: linux-kernel@vger.kernel.org, ardb@kernel.org, corbet@lwn.net, Arnd Bergmann , tony.luck@intel.com, jrtc27@jrtc27.com, glaubitz@physik.fu-berlin.de, willy@infradead.org, Marc Zyngier , linux@roeck-us.net, Linus Torvalds , linux-ia64@vger.kernel.org From: Palmer Dabbelt To: ardb@kernel.org Message-ID: Mime-Version: 1.0 (MHng) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 15 Feb 2023 02:00:03 PST (-0800), ardb@kernel.org wrote: > The IA64 port of Linux has no maintainer, and according to a report from > its only remaining user [0], it has been broken for a month and nobody > cares. > > Given that keeping a complex but unused architecture alive uses up > valuable developer bandwidth, let's just get rid of it. > > This supersedes my patch proposing to mark it as 'dead', which received > no replies from anyone that wants to keep it alive. [1] > > [0] https://www.spinics.net/lists/linux-ia64/msg21926.html > [1] https://lore.kernel.org/all/20230128122904.1345120-1-ardb@kernel.org/ > > Cc: Jonathan Corbet > Cc: Arnd Bergmann > Cc: Tony Luck > Cc: Jessica Clarke > Cc: John Paul Adrian Glaubitz > Cc: Matthew Wilcox > Cc: Marc Zyngier > Cc: Guenter Roeck > Cc: Linus Torvalds > Cc: linux-ia64@vger.kernel.org > > Ard Biesheuvel (5): > arch: Remove Itanium (IA-64) architecture > kernel: Drop IA64 support from sig_fault handlers > Documentation: Drop IA64 from feature descriptions > lib/raid6: Drop IA64 support > Documentation: Drop or replace remaining mentions of IA64 Not sure if I'm missing it in the diff, but it looks like there's also a bunch of "#ifdef __ia64__" and "#ifdef __IA64__" type code spread throughout the kernel. I didn't look at the actual diff, but it's in files that aren't showing up in the diffstat. Just "git grep -i __ia64__" lists a bunch. I didn't look at all of them, but at least spot checking include/acpi/actypes.h looks like it's a real Itanium workaround. If the arch goes, it's probbaly worth removing those too? There's also some mentions of "Itanium" in Documentation outside that don't look like they got caught here. Not sure if they'd be worth getting rid of, though as they could still be useful examples. The blurb in Documentation/memory-barriers.txt looks pretty port-specific, though. > Documentation/ABI/testing/sysfs-devices-system-cpu | 3 - > Documentation/ABI/testing/sysfs-firmware-dmi-entries | 2 +- > Documentation/admin-guide/kdump/kdump.rst | 37 +- > Documentation/admin-guide/kdump/vmcoreinfo.rst | 30 - > Documentation/admin-guide/kernel-parameters.txt | 8 +- > Documentation/admin-guide/mm/memory-hotplug.rst | 2 +- > Documentation/admin-guide/sysctl/kernel.rst | 23 +- > Documentation/arch.rst | 1 - > Documentation/block/ioprio.rst | 3 - > Documentation/core-api/cpu_hotplug.rst | 6 - > Documentation/core-api/debugging-via-ohci1394.rst | 6 +- > Documentation/features/core/cBPF-JIT/arch-support.txt | 1 - > Documentation/features/core/eBPF-JIT/arch-support.txt | 1 - > Documentation/features/core/generic-idle-thread/arch-support.txt | 1 - > Documentation/features/core/jump-labels/arch-support.txt | 1 - > Documentation/features/core/thread-info-in-task/arch-support.txt | 1 - > Documentation/features/core/tracehook/arch-support.txt | 1 - > Documentation/features/debug/KASAN/arch-support.txt | 1 - > Documentation/features/debug/debug-vm-pgtable/arch-support.txt | 1 - > Documentation/features/debug/gcov-profile-all/arch-support.txt | 1 - > Documentation/features/debug/kcov/arch-support.txt | 1 - > Documentation/features/debug/kgdb/arch-support.txt | 1 - > Documentation/features/debug/kmemleak/arch-support.txt | 1 - > Documentation/features/debug/kprobes-on-ftrace/arch-support.txt | 1 - > Documentation/features/debug/kprobes/arch-support.txt | 1 - > Documentation/features/debug/kretprobes/arch-support.txt | 1 - > Documentation/features/debug/optprobes/arch-support.txt | 1 - > Documentation/features/debug/stackprotector/arch-support.txt | 1 - > Documentation/features/debug/uprobes/arch-support.txt | 1 - > Documentation/features/debug/user-ret-profiler/arch-support.txt | 1 - > Documentation/features/io/dma-contiguous/arch-support.txt | 1 - > Documentation/features/locking/cmpxchg-local/arch-support.txt | 1 - > Documentation/features/locking/lockdep/arch-support.txt | 1 - > Documentation/features/locking/queued-rwlocks/arch-support.txt | 1 - > Documentation/features/locking/queued-spinlocks/arch-support.txt | 1 - > Documentation/features/perf/kprobes-event/arch-support.txt | 1 - > Documentation/features/perf/perf-regs/arch-support.txt | 1 - > Documentation/features/perf/perf-stackdump/arch-support.txt | 1 - > Documentation/features/sched/membarrier-sync-core/arch-support.txt | 1 - > Documentation/features/sched/numa-balancing/arch-support.txt | 1 - > Documentation/features/seccomp/seccomp-filter/arch-support.txt | 1 - > Documentation/features/time/arch-tick-broadcast/arch-support.txt | 1 - > Documentation/features/time/clockevents/arch-support.txt | 1 - > Documentation/features/time/context-tracking/arch-support.txt | 1 - > Documentation/features/time/irq-time-acct/arch-support.txt | 1 - > Documentation/features/time/virt-cpuacct/arch-support.txt | 1 - > Documentation/features/vm/ELF-ASLR/arch-support.txt | 1 - > Documentation/features/vm/PG_uncached/arch-support.txt | 1 - > Documentation/features/vm/THP/arch-support.txt | 1 - > Documentation/features/vm/TLB/arch-support.txt | 1 - > Documentation/features/vm/huge-vmap/arch-support.txt | 1 - > Documentation/features/vm/ioremap_prot/arch-support.txt | 1 - > Documentation/features/vm/pte_special/arch-support.txt | 1 - > Documentation/ia64/aliasing.rst | 246 --- > Documentation/ia64/efirtc.rst | 144 -- > Documentation/ia64/err_inject.rst | 1067 --------- > Documentation/ia64/features.rst | 3 - > Documentation/ia64/fsys.rst | 303 --- > Documentation/ia64/ia64.rst | 49 - > Documentation/ia64/index.rst | 19 - > Documentation/ia64/irq-redir.rst | 80 - > Documentation/ia64/mca.rst | 198 -- > Documentation/ia64/serial.rst | 165 -- > Documentation/kbuild/makefiles.rst | 2 +- > Documentation/networking/device_drivers/ethernet/neterion/s2io.rst | 4 +- > Documentation/scheduler/sched-arch.rst | 4 +- > Documentation/trace/kprobes.rst | 1 - > Documentation/translations/zh_CN/arch.rst | 1 - > Documentation/translations/zh_CN/core-api/cpu_hotplug.rst | 6 - > Documentation/translations/zh_CN/scheduler/sched-arch.rst | 5 +- > MAINTAINERS | 11 - > Makefile | 4 +- > arch/Kconfig | 1 - > arch/ia64/Kbuild | 3 - > arch/ia64/Kconfig | 410 ---- > arch/ia64/Kconfig.debug | 55 - > arch/ia64/Makefile | 82 - > arch/ia64/configs/bigsur_defconfig | 102 - > arch/ia64/configs/generic_defconfig | 206 -- > arch/ia64/configs/gensparse_defconfig | 184 -- > arch/ia64/configs/tiger_defconfig | 169 -- > arch/ia64/configs/zx1_defconfig | 148 -- > arch/ia64/hp/common/Makefile | 10 - > arch/ia64/hp/common/aml_nfw.c | 232 -- > arch/ia64/hp/common/sba_iommu.c | 2147 ------------------ > arch/ia64/include/asm/Kbuild | 5 - > arch/ia64/include/asm/acenv.h | 49 - > arch/ia64/include/asm/acpi-ext.h | 17 - > arch/ia64/include/asm/acpi.h | 110 - > arch/ia64/include/asm/agp.h | 27 - > arch/ia64/include/asm/asm-offsets.h | 1 - > arch/ia64/include/asm/asm-prototypes.h | 30 - > arch/ia64/include/asm/asmmacro.h | 136 -- > arch/ia64/include/asm/atomic.h | 223 -- > arch/ia64/include/asm/barrier.h | 79 - > arch/ia64/include/asm/bitops.h | 453 ---- > arch/ia64/include/asm/bug.h | 19 - > arch/ia64/include/asm/bugs.h | 20 - > arch/ia64/include/asm/cache.h | 30 - > arch/ia64/include/asm/cacheflush.h | 33 - > arch/ia64/include/asm/checksum.h | 63 - > arch/ia64/include/asm/clocksource.h | 11 - > arch/ia64/include/asm/cmpxchg.h | 16 - > arch/ia64/include/asm/cpu.h | 23 - > arch/ia64/include/asm/cputime.h | 21 - > arch/ia64/include/asm/current.h | 18 - > arch/ia64/include/asm/cyclone.h | 16 - > arch/ia64/include/asm/delay.h | 89 - > arch/ia64/include/asm/device.h | 14 - > arch/ia64/include/asm/div64.h | 1 - > arch/ia64/include/asm/dma-mapping.h | 16 - > arch/ia64/include/asm/dma.h | 17 - > arch/ia64/include/asm/dmi.h | 15 - > arch/ia64/include/asm/early_ioremap.h | 11 - > arch/ia64/include/asm/efi.h | 13 - > arch/ia64/include/asm/elf.h | 233 -- > arch/ia64/include/asm/emergency-restart.h | 6 - > arch/ia64/include/asm/esi.h | 30 - > arch/ia64/include/asm/exception.h | 23 - > arch/ia64/include/asm/export.h | 3 - > arch/ia64/include/asm/extable.h | 12 - > arch/ia64/include/asm/fb.h | 24 - > arch/ia64/include/asm/fpswa.h | 74 - > arch/ia64/include/asm/ftrace.h | 28 - > arch/ia64/include/asm/futex.h | 109 - > arch/ia64/include/asm/gcc_intrin.h | 13 - > arch/ia64/include/asm/hardirq.h | 27 - > arch/ia64/include/asm/hugetlb.h | 34 - > arch/ia64/include/asm/hw_irq.h | 167 -- > arch/ia64/include/asm/idle.h | 8 - > arch/ia64/include/asm/intrinsics.h | 13 - > arch/ia64/include/asm/io.h | 274 --- > arch/ia64/include/asm/iommu.h | 22 - > arch/ia64/include/asm/iosapic.h | 106 - > arch/ia64/include/asm/irq.h | 37 - > arch/ia64/include/asm/irq_regs.h | 1 - > 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63 - > arch/ia64/include/asm/numa.h | 83 - > arch/ia64/include/asm/page.h | 214 -- > arch/ia64/include/asm/pal.h | 1827 --------------- > arch/ia64/include/asm/param.h | 18 - > arch/ia64/include/asm/parport.h | 20 - > arch/ia64/include/asm/patch.h | 28 - > arch/ia64/include/asm/pci.h | 66 - > arch/ia64/include/asm/percpu.h | 53 - > arch/ia64/include/asm/pgalloc.h | 64 - > arch/ia64/include/asm/pgtable.h | 520 ----- > arch/ia64/include/asm/processor.h | 663 ------ > arch/ia64/include/asm/ptrace.h | 146 -- > arch/ia64/include/asm/sal.h | 919 -------- > arch/ia64/include/asm/sections.h | 33 - > arch/ia64/include/asm/serial.h | 17 - > arch/ia64/include/asm/shmparam.h | 13 - > arch/ia64/include/asm/signal.h | 33 - > arch/ia64/include/asm/smp.h | 103 - > arch/ia64/include/asm/sn/intr.h | 15 - > arch/ia64/include/asm/sn/sn_sal.h | 124 -- > arch/ia64/include/asm/sparsemem.h | 28 - > arch/ia64/include/asm/spinlock.h | 265 --- > arch/ia64/include/asm/spinlock_types.h | 22 - > 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arch/ia64/include/uapi/asm/auxvec.h | 14 - > arch/ia64/include/uapi/asm/bitsperlong.h | 9 - > arch/ia64/include/uapi/asm/break.h | 23 - > arch/ia64/include/uapi/asm/byteorder.h | 7 - > arch/ia64/include/uapi/asm/cmpxchg.h | 159 -- > arch/ia64/include/uapi/asm/fcntl.h | 15 - > arch/ia64/include/uapi/asm/fpu.h | 67 - > arch/ia64/include/uapi/asm/gcc_intrin.h | 619 ------ > arch/ia64/include/uapi/asm/ia64regs.h | 101 - > arch/ia64/include/uapi/asm/intel_intrin.h | 162 -- > arch/ia64/include/uapi/asm/intrinsics.h | 86 - > arch/ia64/include/uapi/asm/mman.h | 17 - > arch/ia64/include/uapi/asm/param.h | 30 - > arch/ia64/include/uapi/asm/posix_types.h | 9 - > arch/ia64/include/uapi/asm/ptrace.h | 248 --- > arch/ia64/include/uapi/asm/ptrace_offsets.h | 269 --- > arch/ia64/include/uapi/asm/resource.h | 8 - > arch/ia64/include/uapi/asm/rse.h | 67 - > arch/ia64/include/uapi/asm/setup.h | 25 - > arch/ia64/include/uapi/asm/sigcontext.h | 71 - > arch/ia64/include/uapi/asm/siginfo.h | 28 - > arch/ia64/include/uapi/asm/signal.h | 98 - > arch/ia64/include/uapi/asm/stat.h | 52 - > arch/ia64/include/uapi/asm/statfs.h | 21 - > arch/ia64/include/uapi/asm/swab.h | 35 - > arch/ia64/include/uapi/asm/types.h | 32 - > arch/ia64/include/uapi/asm/ucontext.h | 13 - > arch/ia64/include/uapi/asm/unistd.h | 22 - > arch/ia64/include/uapi/asm/ustack.h | 13 - > arch/ia64/install.sh | 30 - > arch/ia64/kernel/.gitignore | 3 - > arch/ia64/kernel/Makefile | 46 - > arch/ia64/kernel/Makefile.gate | 29 - > arch/ia64/kernel/acpi-ext.c | 101 - > arch/ia64/kernel/acpi.c | 911 -------- > arch/ia64/kernel/asm-offsets.c | 289 --- > arch/ia64/kernel/audit.c | 63 - > arch/ia64/kernel/brl_emu.c | 217 -- > arch/ia64/kernel/crash.c | 266 --- > arch/ia64/kernel/crash_dump.c | 27 - > arch/ia64/kernel/cyclone.c | 125 -- > arch/ia64/kernel/dma-mapping.c | 9 - > arch/ia64/kernel/efi.c | 1360 ------------ > arch/ia64/kernel/efi_stub.S | 87 - > arch/ia64/kernel/elfcore.c | 77 - > arch/ia64/kernel/entry.S | 1428 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