Re: [PATCH/RFC] Futex mmap_sem deadlock

[Linus Torvalds]

On Wed, 23 Feb 2005, Benjamin Herrenschmidt wrote:
> 
> Isn't Olof scheme racy ? Can't the stuff get swapped out between the
> first get_user() and the "real" one ?

Yes. But see my suggested modification (which I still think is "the thing 
that Olof does", except it's more efficient and avoids the race).

If rwsems acted like rwlocks, we wouldn't have this issue at all.

		Linus
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