Date: Mon, 23 Feb 2004 08:56:43 -0700 From: Scott Long <scottl@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: John Baldwin <jhb@FreeBSD.org> Subject: Re: cvs commit: src/sys/alpha/alpha mem.c promcons.csrc/sys/alpha/tlsbsrc/sys/cam/scsi scsi_ch.c scsi_pass.c scsi_pt.c s Message-ID: <403A22BB.6010409@freebsd.org> In-Reply-To: <8758.1077551092@critter.freebsd.dk> References: <8758.1077551092@critter.freebsd.dk>
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Poul-Henning Kamp wrote: > In message <200402230945.42440.jhb@FreeBSD.org>, John Baldwin writes: > >>On Saturday 21 February 2004 06:13 pm, Poul-Henning Kamp wrote: >> >>>In message <20040221161339.X52892@pooker.samsco.home>, Scott Long writes: >>> >>>>>A grace period is not possible, that is why I have been so vocal >>>>>with my heads-up messages to current for the last two weeks. >>>> >>>>What are the technical reasons for a grace period not being possible? >>> >>>The signflip on the GIANT flag. >> >>Which was arguably premature given the vast number of NEEDGIANT vs. NOGIANT >>case. The MPSAFE flag for interrupts hasn't been flipped yet either for that >>reason. > > > I thought the idea was to try to get the API's set up correctly before > the RELENG_5 branch so that we do not make MFC'ing impossible a few > months after the branchpoing like it happened for 3.x ? > > At least that was part of my motivation for flipping the flag. > > Another part is psychological: I think we need to mark the spots > that need work done rather than put congratulatory notices in dmesg > for the little headway we've done. > > And for both of these reasons I would advocate that MPSAFE gets flipped > before the branch as well. > I agree with these arguments. However, I would have liked to have seen a small grace period defined, especially since people are now bumping into the consequences of this change and not knowing why. I plan to do this with the interrupt API change when it comes. scott
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