> There is a much more serious bug there as well. The code as it
> exists is flatly impossible on x86_64 and some other architectures
> as they do not support kmap. It is also broken on x86 as grain can
All platforms have kmap. On systems without "highmem" the kmap functions
simply return the page address of the existing permanent physical
mapping for the page. See include/linux/highmem.h
So it's all fine and larger than page sized scrubs can be added to the
core code when they are needed.
Alan
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