> Ingo's argument was that since there is only one place in code that
> accesses that variable (map->page), it is safe to rely on such a
> crippled cmpxchg implementation.
yes. It's only this place in the code that ever modifies that word, and
that happens only once during the lifetime of this address, so i'll rather
add a spinlock to the generic PID allocator code, it's a very very rare
slowpath.
Ingo
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