Messages in this thread | | | Date | Sun, 23 May 2004 21:36:40 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE |
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On Mon, 24 May 2004, Benjamin Herrenschmidt wrote: > > Typically, you can have a thread faulting on a page. It goes through hash_page, > doesn't find the entry, and gets to do_page_fault(). However, just before it > takes the mm sem, another thread actually mmap's that page in. Thus we end up > in handle_pte_fault() with a present PTE which has a valid mapping already.
Ok, with you so far. But I don't see how you get to set_pte() that way, since handle_pte_fault() will re-test the pte_present() bit, and never even try to set_pte() if one already exists. Hmm?
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