Re: [RFC PATCH 0/5] Retire IA64/Itanium support
From: Palmer Dabbelt
Date: Wed Feb 15 2023 - 11:50:45 EST
On Wed, 15 Feb 2023 02:00:03 PST (-0800), ardb@xxxxxxxxxx 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@xxxxxxxxxx/
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Jessica Clarke <jrtc27@xxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-ia64@xxxxxxxxxxxxxxx
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.
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kernel/cpu.c | 3 -
kernel/fork.c | 2 +-
kernel/sched/core.c | 29 +-
kernel/signal.c | 25 +-
kernel/sysctl.c | 9 -
lib/Kconfig.debug | 2 +-
lib/decompress_unxz.c | 3 -
lib/raid6/Makefile | 4 +-
lib/raid6/algos.c | 4 -
lib/xz/Kconfig | 5 -
mm/mmap.c | 6 +-
scripts/headers_install.sh | 1 -
tools/arch/ia64/include/asm/barrier.h | 59 -
tools/arch/ia64/include/uapi/asm/bitsperlong.h | 9 -
tools/arch/ia64/include/uapi/asm/mman.h | 7 -
usr/include/Makefile | 6 -
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