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SubjectRe: cmpxchg in 2.5.38
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   From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 25 Sep 2002 10:26:34 +0200 (CEST)

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.

You can't define a crippled primitive like this Ingo.

What if someone else starts to use it?

And more importantly, if you can't use it on a datum shared between
userspace and the kernel, you have to name it something other than
cmpxchg or make the DRM use something else.
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