Revert "RCU: Joe's RCU. Forward port jRCU to linux-3.0"

This reverts commit c27e5c1bb314552550cfa67cb9c73f433dc1afbd.
Revert "mm/slqb: replace deprecated function"

This reverts commit 636f9d1695608363d2c0fd8113b2a8b736924258.
Revert "patch: add SLQB memory allocator by Nick Piggin"

This reverts commit 8e2112cc638225e19d2461c8354e38b79a3765db.