Re: [PATCH/RFC] Futex mmap_sem deadlock

[Benjamin Herrenschmidt]

On Tue, 2005-02-22 at 11:36 -0800, Linus Torvalds wrote:

> DavidH - what's the word on nested read-semaphores like this? Are they 
> supposed to work (like nested read-spinlocks), or do we need to do the 
> things Olof does?

Isn't Olof scheme racy ? Can't the stuff get swapped out between the
first get_user() and the "real" one ?

Ben.


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