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Date: Tue, 22 Sep 2009 20:08:59 +0300 From: Avi Kivity <avi@...hat.com> To: Ingo Molnar <mingo@...e.hu> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>, "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com> Subject: Re: [PATCH v2] core, x86: Add user return notifiers 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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