linux-kernel - Re: [RFC 13/13] m68k: mac: convert to generic clockevent

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Date:   Fri, 6 Nov 2020 13:52:01 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
cc:     Arnd Bergmann <arnd@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Philip Blundell <philb@....org>,
        Joshua Thompson <funaho@...ai.org>,
        Sam Creasey <sammy@...my.net>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 13/13] m68k: mac: convert to generic clockevent

On Fri, 23 Oct 2020, Geert Uytterhoeven wrote:

> > > > The arm/rpc timer seems to be roughly in the same category as most 
> > > > of the m68k ones or the i8253 counter on a PC. It's possible that 
> > > > some of them could use the same logic as 
> > > > drivers/clocksource/i8253.o as long as there is any hardware 
> > > > oneshot mode.
> > >
> > > There appear to be 15 platforms in that category. 4 have no 
> > > clocksource besides the jiffies clocksource, meaning there's no 
> > > practical alternative to using a periodic tick, like you did in your 
> > > RFC patch:
> > >
> > > arch/m68k/apollo/config.c
> > > arch/m68k/q40/q40ints.c
> > > arch/m68k/sun3/sun3ints.c
> > > arch/m68k/sun3x/time.c
> >
> > Do any of these have users? I'm fairly sure sun3x has never worked in 
> > mainline, sun3 seems to still need the same few patches it did 20 
> > years ago. I couldn't find much about Linux on Apollo or q40, the 
> > information on the web for either of them seems to all be for 
> > linux-2.4 kernels.
> 
> They probably don't have any users.

I have access to several Sun 3 machines but no time to work on that port, 
unfortunately.

Are these 4 platforms (those with no clocksource besides the "jiffies" 
clocksource) the only reason for CONFIG_TIME_LOW_RES on m68k?