Re: Remove timecounter tc_counter_mask member?

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk>
Date: Tue, 19 Sep 2023 15:41:33 UTC
--------
Sebastian Huber writes:
> On 16.09.23 22:44, Poul-Henning Kamp wrote:
> > Sebastian Huber writes:
> > 
> >> the timecounter structure contains a tc_counter_mask which enables
> >> support for time counters implementing less than 32-bits:
> >> Is the sys/x86/isa/clock.c still used? Are there chips on the market
> >> with 24-bit ACPI timers?
> > ... and are there any FreeBSD platforms using narrow timecounters
> > outside the src-tree ?
> > 
> > My personal gut feeling, is that we can get away with it, once i386
> > is out of the picture.
>
> If it is in principle acceptable to remove the tc_counter_mask at some 
> point in time, would it make sense to issue a warning if a timecounter 
> is installed with a mask not equal to 0xffffffff?

It would be a good a way to warn people...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.