New additions to the driver porting series

The LWN.net series on porting drivers (and other kernel code) to the 2.5 kernel continues this week with three new articles. Two of them (on low-level memory allocation and per-CPU variables) appear below; the third (an updated description of the seqlock mechanism) is available but won't be included inline here. As always, the full series can be found at http://lwn.net/Articles/driver-porting/.

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