From: Andi Kleen <[email protected]>
Date: Fri, 9 Feb 2007 12:50:06 +0100
>
> > Yes, it is a bit, umm, innovative. If it is going to be kept, even if
> > just for devel logging, you should disable interrupts around it.
> > Changing segments is not a normal thing to do.
>
> Actually that wouldn't be needed because interrupts are not allowed to do any
> user accesses. And contrary to the name it doesn't actually change
> the segment registers, only state used by *_user.
That's right and we use this construct all throughout the
syscall compatibility layer for 64-bit platforms.
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