| Date | Thu, 5 Jun 2014 15:48:41 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 5/9] perf/x86: implement cross-HT corruption bug workaround |
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On Wed, Jun 04, 2014 at 11:34:14PM +0200, Stephane Eranian wrote:
> +static struct event_constraint * > +intel_get_excl_constraints(struct cpu_hw_events *cpuc, struct perf_event *event, > + struct event_constraint *c) > +{
> + if (!(c->flags & PERF_X86_EVENT_DYNAMIC)) { > + > + /* > + * in case we fail, we assume no counter > + * is supported to be on the safe side > + */ > + cx = kmalloc(sizeof(*cx), GFP_KERNEL); > + if (!cx) > + return &emptyconstraint; > +
Ok, so forgive me if I'm wrong, but the way we get here is through:
x86_schedule_event() ->start_scheduling() spin_lock() ->get_event_constraints() intel_get_excl_constraints() kmalloc(.gfp=GFP_KERNEL)
How can that ever work? [unhandled content-type:application/pgp-signature] |