Re: [PATCH/RFC] Futex mmap_sem deadlock

Benjamin Herrenschmidt
2005-02-22T21:17:18Z

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.