On 09/22/2009 06:50 PM, Avi Kivity wrote:
On 09/22/2009 05:45 PM, Avi Kivity wrote:
Would be nice to convert some existing open-coded return-to-user-space
logic to this facility. One such candidate would be lockdep_sys_exit?
I only implemented this for x86, while lockdep is arch independent.
If arch support is added, it should be trivial.
The lockdep_sys_exit bit is actually x86/s390 only, and can easily be
adapted to use the new functionality on x86 only. I'll try it out.
Unfortunately it doesn't work out well. The notifier is called until
explicitly unregistered (since it relies on a bit in TIF_NOTIFY_MASK),
so we have to disarm it on the first return to usersspace or it spins
forever. We could re-arm it on the next kernel entry, but we don't have
a kernel entry notifier so we'll just be moving hooks from one point to
another.
--
error compiling committee.c: too many arguments to function
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