Messages in this thread | | | Subject | Re: [PATCH/RFC] Futex mmap_sem deadlock | From | Benjamin Herrenschmidt <> | Date | Wed, 23 Feb 2005 08:19:20 +1100 |
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On Wed, 2005-02-23 at 08:16 +1100, Benjamin Herrenschmidt wrote: > 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 ?
Forget it, I missed the check_user_page_readable() guy within the semaphore protection. I didn't know that function ;)
Ben.
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