cvs commit: src/sys/alpha/alpha mem.c promcons.c src/sys/alpha/tlsb zs_tlsb.c src/sys/amd64/amd64 mem.c src/sys/cam cam_xpt.c src/sys/cam/scsi scsi_ch.c scsi_pass.c scsi_pt.c s

[Poul-Henning Kamp]

In message <200402230945.42440.jhb at FreeBSD.org>, John Baldwin writes:
>On Saturday 21 February 2004 06:13 pm, Poul-Henning Kamp wrote:
>> In message <20040221161339.X52892 at 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.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at 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.