Date: Wed, 10 Sep 2003 09:31:34 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: dfr@nlsystems.com Cc: arch@freebsd.org Subject: Re: When to burn those bridges Message-ID: <20030910.093134.112624676.imp@bsdimp.com> In-Reply-To: <1063181264.43759.6.camel@herring.nlsystems.com> References: <1063106587.25817.23.camel@builder02.qubesoft.com> <20030909.190335.130622954.imp@bsdimp.com> <1063181264.43759.6.camel@herring.nlsystems.com>
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In message: <1063181264.43759.6.camel@herring.nlsystems.com>
Doug Rabson <dfr@nlsystems.com> writes:
: On Wed, 2003-09-10 at 02:03, M. Warner Losh wrote:
: > If there's a really compelling reason (and this would be it), we can
: > burn some bridges early. I wouldn't hold up your development based on
: > these bridges being in harm's way. Others in the BSDcon terminal room
: > are saying "do it now, screw waiting for 6". If you can get it done
: > and solid, I'd do it before the branch. The drivers in harm's way
: > either have out of tree replacements, or aren't that important, or
: > need to be redone and this is a good excuse.
:
: If I commit this work to -current now, it will break ABI compatibility
: with 5.1-RELEASE. When is the ABI for 5.x suppose to be frozen? Does it
: matter if I break the 5.1 ABI in current? For what its worth, this
: change will also make the kobj method dispatch SMP safe (without locks).
We can still break ABI with 5.1 if there's a good reason. Making
things MP stafe is a good reason.
: > : The same technique could be used to reduce the number of 'converter'
: > : devices.
: >
: > I like this. pcic/cbb have similar issues, but the size of the
: > problem is small.
:
: Its mainly a cosmetic thing but it has always been an irritation to me
: to have these little clusters of devices where there is only one piece
: of hardware, e.g.:
:
: hostb0
: pci0
: pcib1
: pci1
: amdpm0
: smbus0
: smb0
:
: should become:
:
: pci0
: pci1
: amdpm0
Actually, the bridges do add value, so at least pcib would need to
remain. I think it would be hard to get rid of them, but there could
easily be something that I'm missing.
Warner
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