RE: pstore: change mutex locking to spin_locks

[Luck, Tony]

> But in this case we have a filesystem that can be read/written to from a
> normal context and also written to from an NMI context

I fixed (avoided) the problem of writing to the pstore filesystem in NMI
context in my other pstore patch in linux-next ("defer inserting OOPS entries in pstore").

So the remaining locking requirement in pstore is just to protect
the non-volatile backing store from simultaneous access.

-Tony


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