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Date: Mon, 27 Aug 2018 13:28:35 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: removig ia64, was: Re: [PATCH 3/4] mm/tlb, x86/mm: Support
 invalidating TLB caches for RCU_TABLE_FREE
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To: Christoph Hellwig <hch@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>, Will Deacon <will.deacon@arm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Benjamin Herrenschmidt <benh@au1.ibm.com>, Andrew Lutomirski <luto@kernel.org>, the arch/x86 maintainers <x86@kernel.org>, Borislav Petkov <bp@alien8.de>, Rik van Riel <riel@surriel.com>, Jann Horn <jannh@google.com>, Adin Scannell <ascannell@google.com>, Dave Hansen <dave.hansen@intel.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, David Miller <davem@davemloft.net>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Michael Ellerman <mpe@ellerman.id.au>, Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>, linux-ia64@vger.kernel.org

On Mon, Aug 27, 2018 at 01:57:08AM -0700, Christoph Hellwig wrote:
> On Mon, Aug 27, 2018 at 09:47:01AM +0200, Peter Zijlstra wrote:
> > sh is trivial, arm seems doable, with a bit of luck we can do 'rm -rf
> > arch/ia64' leaving us with s390.
> 
> Is removing ia64 a serious plan?

I 'joked' about it a while ago on IRC, and aegl reacted that it might
not be entirely unreasonable.

> It is the cause for a fair share of
> oddities in dma lang, and I did not have much luck getting maintainer
> replies lately, but I didn't know of a plan to get rid of it.
> 
> What is the state of people still using ia64 mainline kernels vs just
> old distros in the still existing machines?

Both arjan and aegl said that the vast majority of people still running
ia64 machines run old distros.