[PATCH v2 0/2] ia64: prevent irq migration race in __cpu_disablepath

[Alex Chiang]

This is v2 of my attempt to prevent an oops while offlining CPUs.

The change is that the patch becomes a full revert of Paul's
original patch, along with a long changelog that explains the
situation as best as I can determine. It's not 100% satisfactory
to me right now, but the testing we've done supports the patch.

The 2nd patch in the series is mostly cosmetic, and removes a
redundant call to cpu_clear() that we no longer need().

Tony, if you agree with the rationale in 1/2, then this series is
a candidate for .29.

stable team, if Tony pushes upstream for .29, then this series
should be applied to the .27 and .28 stable series.

Thanks.

/ac

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