Yes, I am sorry for the misleading logic in my note. Per-cpu caches are
safe (I wonder why it was taken out for i386). For architectures that
have to do set_pgdir() though, the pgdir update code might be racy,
unless the arch code has locks to protect the page directory scanning.
Btw, Linus indicated to me he ran into problems with the patch, and
will be pulling it out in the next pre-release. I will take a closer look
at the code.
Kanoj
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