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Linus Torvalds
4293f20c19
This reverts commit 8f2f748b06.
It causes some odd regression that we have not figured out, and it's too
late in the -rc series to try to figure it out now.
As reported by Konstantin Khlebnikov, it causes consistent hangs on his
laptop (Thinkpad x220: 2x cores + HT). They can be avoided by adding
calls to "rebuild_sched_domains();" in cpuset_cpu_[in]active() for the
CPU_{ONLINE/DOWN_FAILED/DOWN_PREPARE}_FROZEN cases, but it's not at all
clear why, and it makes no sense.
Konstantin's config doesn't even have CONFIG_CPUSETS enabled, just to
make things even more interesting. So it's not the cpusets, it's just
the scheduling domains.
So until this is understood, revert.
Bisected-reported-and-tested-by: Konstantin Khlebnikov <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Acked-by: Srivatsa S. Bhat <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>