Ok, I've probably isolated the commit.
I found the new location of the "tip" tree, then read up on git, and set
to work. "git bisect" helped me find the commit where things stop
working:
"genirq: spurious: Run only one poller at a time
author Thomas Gleixner <t...@linutronix.de>
Mon, 7 Feb 2011 13:31:37 +0000 (14:31 +0100)
committer Thomas Gleixner <t...@linutronix.de>
Sat, 19 Feb 2011 11:58:09 +0000 (12:58 +0100)
commit d05c65fff0ef672be75429266751f0e015b54d94
No point in running concurrent pollers which confuse each other by
setting PENDING."
The small diff is at:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=d05c65fff0ef672be75429266751f0e015b54d94
I haven't mailed Mr. Gleixner and LKML again, yet. I may try to take
time, to consider how best to get their attention, and whether to
propose reverting, or modifying, the patch.
I do see that while bugzilla is down, Maciej Rutecki,
<maciej.rute...@gmail.com> , is keeping a list of regressions, and asks
to be CC'd on regression reports. I'll include him, too.
And if any other user beats me to trying them, again, be my guest. :-)
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https://bugs.launchpad.net/bugs/855199
Title:
2.6.39 and later have lost "irqfixup" and "irqpoll" functionality
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