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From: Palmer Dabbelt <palmer@dabbelt.com>
To: ardb@kernel.org
Cc: linux-kernel@vger.kernel.org, corbet@lwn.net,
	Arnd Bergmann <arnd@arndb.de>,
	tony.luck@intel.com, jrtc27@jrtc27.com,
	glaubitz@physik.fu-berlin.de, willy@infradead.org,
	Marc Zyngier <maz@kernel.org>,
	linux@roeck-us.net,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-ia64@vger.kernel.org
Subject: Re: [RFC PATCH 0/5] Retire IA64/Itanium support
Date: Wed, 15 Feb 2023 10:20:47 -0800 (PST)	[thread overview]
Message-ID: <mhng-5f83e606-a48d-4d18-bae1-20a6cc01952e@palmer-ri-x1c9> (raw)
In-Reply-To: <CAMj1kXFmZYmrZB7QyLCu3rpkChat=PVqPHsOi+HuWRj-FZ2S-g@mail.gmail.com>

On Wed, 15 Feb 2023 09:00:28 PST (-0800), ardb@kernel.org wrote:
> On Wed, 15 Feb 2023 at 17:50, Palmer Dabbelt <palmer@dabbelt.com> wrote:
>>
>> 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 <corbet@lwn.net>
>> > Cc: Arnd Bergmann <arnd@arndb.de>
>> > Cc: Tony Luck <tony.luck@intel.com>
>> > Cc: Jessica Clarke <jrtc27@jrtc27.com>
>> > Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
>> > Cc: Matthew Wilcox <willy@infradead.org>
>> > Cc: Marc Zyngier <maz@kernel.org>
>> > Cc: Guenter Roeck <linux@roeck-us.net>
>> > Cc: Linus Torvalds <torvalds@linux-foundation.org>
>> > 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.
>>
>
> Thanks for taking a look. It seems I indeed missed a couple.
>
>> 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?
>>
>
> The ACPI code is synced with another project, so I didn't touch it.
> Same goes for some other header files where IA-64 is referenced, e.g.,
> in the PE/COFF header stuff.

Thanks, I didn't know that.  Pretty sure there's some scattered in 
drivers, but...

>> 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.
>>
>
> Yeah, I don't think it is necessary to rewrite history soviet-style,
> so some remaining references are fine IMHO.

That seems reasonable to me -- assuming the port goes the rest is just 
dead code so it'll filter out over time (presumably all over userspace 
too, which will take a while).

  reply	other threads:[~2023-02-15 18:20 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-15 10:00 [RFC PATCH 0/5] Retire IA64/Itanium support Ard Biesheuvel
2023-02-15 10:00 ` [RFC PATCH 1/5] arch: Remove Itanium (IA-64) architecture Ard Biesheuvel
2023-02-15 16:55   ` Guenter Roeck
2023-02-15 16:58   ` Guenter Roeck
2023-02-15 16:59     ` Ard Biesheuvel
2023-02-15 10:00 ` [RFC PATCH 2/5] kernel: Drop IA64 support from sig_fault handlers Ard Biesheuvel
2023-02-15 10:19   ` Arnd Bergmann
2023-02-15 11:13     ` Arnd Bergmann
2023-02-15 11:22       ` Ard Biesheuvel
2023-02-15 12:46         ` Arnd Bergmann
2023-02-15 10:00 ` [RFC PATCH 3/5] Documentation: Drop IA64 from feature descriptions Ard Biesheuvel
2023-02-15 10:00 ` [RFC PATCH 4/5] lib/raid6: Drop IA64 support Ard Biesheuvel
2023-02-15 10:00 ` [RFC PATCH 5/5] Documentation: Drop or replace remaining mentions of IA64 Ard Biesheuvel
2023-02-15 10:17 ` [RFC PATCH 0/5] Retire IA64/Itanium support John Paul Adrian Glaubitz
2023-02-15 19:30   ` Linus Torvalds
2023-02-15 19:42     ` Luck, Tony
2023-02-15 20:08       ` Linus Torvalds
2023-02-15 23:13         ` John Paul Adrian Glaubitz
2023-02-22 21:52           ` matoro
2023-02-16  5:04         ` Mike Rapoport
2023-02-15 23:09     ` John Paul Adrian Glaubitz
2023-02-15 16:50 ` Palmer Dabbelt
2023-02-15 17:00   ` Ard Biesheuvel
2023-02-15 18:20     ` Palmer Dabbelt [this message]
2023-03-17 22:55 ` Florian Weimer
2023-05-12 14:45   ` Ard Biesheuvel
2023-05-12 14:58     ` Florian Weimer

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