HEADSUP: Change of makedev() semantics.
From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 09/28/03
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To: arch@freebsd.org, current@freebsd.org Date: Sun, 28 Sep 2003 23:22:07 +0200
I am in the process of adding ref-counting and locking to dev_t,
and would very much prefer if we could get this step completed
soon before 5-STABLE gets branched.
All this will be transparent to the majority of device drivers, as
the refcounting will happen in the make_dev() and destroy_dev()
family of calls and normal drivers need not know more about it.
But there are a few remaining users of makedev() which get in the
way of this effort, and we must get these fixed.
Basically:
1. Do not call makedev().
2. If you do cloning, please look at the patches I posted
for if_tun/if_tap for how to do it.
3. If you do a "normal" device driver, cache the result
from when you call make_dev().
4. If you translate "foreign dev_t's", ie emulators or
compat code, contact me. I'm not sure I understand
how this works and should work and we need to talk.
5. If anything else or in doubt, ask me.
Can I see some volounteers and/or maintainers please ?
./alpha/osf1/osf1_misc.c
badly named local macro ?
./compat/linux/linux_stats.c
./compat/svr4/svr4_types.h
compat code, not sure that this is correct now.
Must be supported by new "finddev" semantics.
./dev/ata/atapi-cd.c
cloning related to root mount.
gets fixed when phk GEOMify the driver.
./dev/sound/midi/midi.h
Not sure.
./dev/nmdm/nmdm.c
pseudo-cloning. Should do real cloning.
./dev/syscons/syscons.c
Related to console initialization. Maybe tricky.
./dev/sound/pcm/dsp.c
./dev/sound/pcm/mixer.c
./dev/usb/ugen.c
./dev/usb/uscanner.c
Failure to cache result of make_dev()
./dev/vinum
Failure to cache result of make_dev() ?
Thanks in advance!
-- 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. _______________________________________________ freebsd-arch@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-arch To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"
- Previous message: Adam C. Migus: "Re: sys/conf/DEFAULT[S]"
- Next in thread: Greg 'groggy' Lehey: "Re: HEADSUP: Change of makedev() semantics."
- Reply: Greg 'groggy' Lehey: "Re: HEADSUP: Change of makedev() semantics."
- Reply: Bernd Walter: "Re: HEADSUP: Change of makedev() semantics."
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