On Thu, Nov 20, 2014 at 03:08:03PM -0800, Andy Lutomirski wrote: > > So, for now, all we need is adding nmi check in percpu accessors, > > right? > > > > What's the issue with nmi? Page faults are supposed to nest correctly > inside nmi, right?
Thought they couldn't. Looking at the trace that Frederic linked, it looks like straight-out tracing function recursion due to an unexpected fault while holding a lock. I don't think this can be annotated from percpu accessor side. There's nothing special about the context. :( Does this matter for anybody other than tracers? Ultimately, the solution would be removing the vmalloc area faulting as Thomas suggested. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
