Kernel config option which causes reiser4 to be instable

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Hello!

With help of Dušan Čolić <dusanc@xxxxxxxxx> who provided his kernel config 
diff I've found a kernel option which, when disabled, greatly reduces 
(hopefully to zero, but need time to verify it) corruption rate in reiser4.

It's CONFIG_TRANSPARENT_HUGEPAGE (or something which is used by it like 
CONFIG_COMPACTION or CONFIG_MIGRATION).
For now I'm testing it with CONFIG_TRANSPARENT_HUGEPAGE disabled on kernel 
3.6.10, and everything seems to be OK so far (so the workaround is version-
agnostic).

Edward, are there any guesses on what can make reiser4 choke on 
hugepages/compaction/migration? I'm not even barely familiar with the kernel 
internals.

Thanks,
Ivan.
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