linux-kernel - Re: [RFC PATCH 2/5] kernel: Drop IA64 support from sig

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Message-Id: <62e7ab37-1148-4cf1-8d6a-3da440fa623f@app.fastmail.com>
Date:   Wed, 15 Feb 2023 12:13:06 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Ard Biesheuvel" <ardb@...nel.org>, linux-kernel@...r.kernel.org
Cc:     "Jonathan Corbet" <corbet@....net>,
        "Tony Luck" <tony.luck@...el.com>,
        "Jessica Clarke" <jrtc27@...c27.com>,
        "John Paul Adrian Glaubitz" <glaubitz@...sik.fu-berlin.de>,
        "Matthew Wilcox" <willy@...radead.org>,
        "Marc Zyngier" <maz@...nel.org>,
        "Guenter Roeck" <linux@...ck-us.net>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        linux-ia64@...r.kernel.org
Subject: Re: [RFC PATCH 2/5] kernel: Drop IA64 support from sig_fault handlers

On Wed, Feb 15, 2023, at 11:19, Arnd Bergmann wrote:
>
> I can probably do the same recursive check for removed Kconfig
> options that I used for finding dead code after the boardfile
> removal.

FWIW, here is the list from a bit of scripting. Symbols that
are only defined in arch/ia64 but are referenced elsewhere are:

CONFIG_IA64
CONFIG_IA64_PAGE_SIZE_64KB
CONFIG_IA64_SGI_UV
CONFIG_IA64_DEBUG_CMPXCHG
CONFIG_MSPEC

Kconfig symbols that are only selected in arch/ia64 but
defined elsewhere are

CONFIG_ARCH_HAS_DMA_MARK_CLEAN
CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
CONFIG_ARCH_TASK_STRUCT_ON_STACK
CONFIG_ARCH_THREAD_STACK_ALLOCATOR
CONFIG_GENERIC_IRQ_LEGACY

plus a few that have only one or two other places selecting them:

CONFIG_ARCH_CLOCKSOURCE_DATA (sparc64)
CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC (x86)
CONFIG_ATA_NONSTANDARD (powerpc-maple)
CONFIG_FUNCTION_ALIGNMENT_32B (i386)
CONFIG_HUGETLB_PAGE_SIZE_VARIABLE (powerpc64)
CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT (x86, loongarch)
CONFIG_ARCH_BINFMT_ELF_EXTRA_PHDRS (arm64, arch/um 32-bit)
CONFIG_HAVE_FUNCTION_DESCRIPTORS (ppc64be, parisc64)
CONFIG_HAVE_UNSTABLE_SCHED_CLOCK (parisc, x86)
CONFIG_HAVE_VIRT_CPU_ACCOUNTING (powerpc, s390)
CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN (arc, loongarch)

      Arnd