linux-kernel - Re: removig ia64, was: Re: [PATCH 3/4] mm/tlb, x86/mm: Support invalidating TLB caches for RCU_TABLE

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Message-ID: <20180827112835.GC24124@hirez.programming.kicks-ass.net>
Date:   Mon, 27 Aug 2018 13:28:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Nicholas Piggin <npiggin@...il.com>,
        Will Deacon <will.deacon@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Benjamin Herrenschmidt <benh@....ibm.com>,
        Andrew Lutomirski <luto@...nel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Rik van Riel <riel@...riel.com>,
        Jann Horn <jannh@...gle.com>,
        Adin Scannell <ascannell@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        David Miller <davem@...emloft.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: removig ia64, was: Re: [PATCH 3/4] mm/tlb, x86/mm: Support
 invalidating TLB caches for RCU_TABLE_FREE

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.