linux-kernel - RE: [PATCH 1/2] futex: mark futex_detect

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Date:   Wed, 16 Dec 2020 10:07:17 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Sam Ravnborg' <sam@...nborg.org>, Arnd Bergmann <arnd@...nel.org>
CC:     Guo Ren <guoren@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        "Marco Elver" <elver@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Elena Reshetova" <elena.reshetova@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [PATCH 1/2] futex: mark futex_detect_cmpxchg() as 'noinline'

From: Sam Ravnborg
> Sent: 15 December 2020 19:38
> 
> Hi Arnd,
> 
> On Tue, Dec 15, 2020 at 12:26:10PM +0100, Arnd Bergmann wrote:
> > On Tue, Dec 15, 2020 at 7:09 AM Guo Ren <guoren@...nel.org> wrote:
...
> > - Disable SMP support for sun4m/sun4d. From the historic git
> >   tree, it's unclear how well this ever worked, and very few machines
> >   of this class ever existed
> Yeah, I have collection of sparc32 machines that I played around with
> once. Including one sun4d that I brought from a friendly Linux fellow in
> the UK. But somehow I lost interest as this is all very nice machines
> but not useful for anything real work.

ICL made a few SMP sparc32 systems.
I think the first ones used the original Cypress cpu running at 25MHz.
(I'm fairly sure these were SMP-capable, the later 40MHz definitely were.)
These were full sized VMEbus beasts.
Somewhere I've got a 32MByte memory board - over a square foot of board.
The memory is all 64k by 1 with all the pins on one edge and the chips vertical.
Really looks as though it should glow red and be used for cooking toast.
Even with 4 of those you're not going to run anything modern!

There were also some later mbus+sbus systems with dual sbus!
Designed by Fujitsu.

None of these ever ran solaris.

	David

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