Messages in this thread | | | From | "Manfred Spraul" <> | Subject | Re: [PATCH?] Crash in 2.4.17/ptrace | Date | Mon, 28 Jan 2002 23:07:30 +0100 |
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From: "Alan Cox" <alan@lxorguk.ukuu.org.uk> > > For framebuffers addresses, there is no page structure, and then the > > page reference count updates read/write to random memory. > > If it is a physical pci bus object why do we need to refcount it, > surely "no page" is ok. Its just up to the driver not to do anything > stupid and the core code to honour the pci/pci transfer quirks (or > when faced with a hard one just say "no") > With multi-threaded apps, munmap() during O_DIRECT is possible. vma structures don't contain a reference count.
For ptrace, taking the physical address from the PTE and ioremapping it temporarily would work, but ...
-- Manfred
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