linux-kernel - RE: [RFC PATCH] docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER EFFECTS" section

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F7D4FF0DE@ORSMSX110.amr.corp.intel.com>
Date:   Wed, 13 Feb 2019 18:43:41 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     Will Deacon <will.deacon@....com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Arnd Bergmann <arnd@...db.de>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        "Daniel Lustig" <dlustig@...dia.com>,
        David Howells <dhowells@...hat.com>,
        Alan Stern <stern@...land.harvard.edu>
Subject: RE: [RFC PATCH] docs/memory-barriers.txt: Rewrite "KERNEL I/O
 BARRIER EFFECTS" section

> I think the last time this came up, it was said that those people still
> running Linux on Itanium were running old distro kernels, not upstream.
>
> So yeah, we could probably do whatever and nobody would ever notice,
> except maybe Al, who is rumoured to still have an ia64 :-)

I haven't heard of anyone taking upstream kernels and actually using them
for production work in a long time. It's mostly just a few folks keeping ia64
alive "just because" these days.  I doubt any of them have an SGI Altix
to test on (so realistically Altix was probably broken upstream many releases
ago).

-Tony