Date: Wed, 12 May 1999 19:44:07 -0500 (CDT) From: Richard Wackerbarth <rkw@dataplex.net> To: Mike Smith <mike@smith.net.au> Cc: Noriyuki Soda <soda@sra.co.jp>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Tomoaki NISHIYAMA <tomoaki@biol.s.u-tokyo.ac.jp>, rwhitesel@nbase-xyplex.com, current@FreeBSD.ORG Subject: Re: cvs commit: src/sys/pci pcisupport.c Message-ID: <Pine.BSF.4.05.9905121935270.1377-100000@nomad.dataplex.net> In-Reply-To: <199905122229.PAA01663@dingo.cdrom.com>
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On Wed, 12 May 1999, Mike Smith wrote: > > This option should automatically select the appropriate sources > > which is compiled into kernel, according to the source is needed > > only in UP case, or only in SMP case, or both. This is what > > oldconfig and newconfig does. > > This is, again, defective reasoning. > > For a usable dynamic architecture, loadable modules need to be compiled > to support both UP and SMP architectures simultaneously. Thus the > locking primitives need to be conditionalised at _runtime_. Or, alternately, at load time by choosing the appropriate subsystem to match the hardware. It is clearly possible to arrange that lowest-common-denominator code is initially loaded and then replaced with a configuration optimized version. The "configuration" at compile time is in the Makefile to cause, when appropriate, the various versions to be compiled from common code. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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