[PATCH 0 of 2] Add memcpy_cachebypass, a memcpy that doesn't cache reads

These patches add a memcpy that doesn't cache reads, and use it in the
ipath driver's OpenIB receive path.

This version incorporates a few changes asked for last time around by DaveM.

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Follow-Ups:
- Re: [PATCH 0 of 2] Add memcpy_cachebypass, a memcpy that doesn't cache reads
  - From: Andrew Morton <[email protected]>
- [PATCH 2 of 2] IB/ipath - use memcpy_cachebypass in RDMA interrupt handler to reduce packet loss
  - From: "Bryan O'Sullivan" <[email protected]>
- [PATCH 1 of 2] Add memcpy_cachebypass, a memcpy that tries to reduce cache pressure
  - From: "Bryan O'Sullivan" <[email protected]>

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