On 04/26/2011 05:40 PM, Takuya Yoshikawa wrote:
On Tue, 26 Apr 2011 08:34:57 +0200 Jan Kiszka<jan.kiszka@xxxxxx> wrote: > > Google said that there was a similar talk on LKML in 2004. > > > > On that threads, Linus explained how to tackle on the 64-bit get_user > > implementation. But I could not see what happened after that. > > Mmh, maybe the kernel was lacking a real use case, so no one seriously > cared. > > I don't see a fundamental blocker for an x86-32 __get_user_8 version > based on two mov. I would give it a try. > > Jan > Thank you! Avi, do we revert the patch now, or ...?
Please post a simple patch that uses two get_user()s for that case (64-bit pte on 32-bit host). Then work with the x86 tree to see if they'll accept 64-bit get_user(), and once they do, we can go back to a simple get_user() again.
btw, I think we can use __get_user() here since the address must have been already validated.
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