From mboxrd@z Thu Jan 1 00:00:00 1970 From: Finn Thain Date: Fri, 06 Nov 2020 02:52:01 +0000 Subject: Re: [RFC 13/13] m68k: mac: convert to generic clockevent Message-Id: List-Id: References: <20201008154651.1901126-1-arnd@arndb.de> <20201008154651.1901126-14-arnd@arndb.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Geert Uytterhoeven Cc: Arnd Bergmann , "linux-kernel@vger.kernel.org" , Russell King , Tony Luck , Fenghua Yu , Greg Ungerer , Philip Blundell , Joshua Thompson , Sam Creasey , "James E.J. Bottomley" , Helge Deller , Thomas Gleixner , Daniel Lezcano , John Stultz , Stephen Boyd , Linus Walleij , "linux-ia64@vger.kernel.org" , Parisc List , linux-m68k , Linux ARM 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?