Quoting Tvrtko Ursulin (2019-01-15 11:54:15)
>
> On 14/01/2019 21:17, Chris Wilson wrote:
> > -static int i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier
> > *_mn,
> > - const struct mmu_notifier_range *range)
> > +static struct mutex *__i915_mutex_lock_recursive(struct mutex *m)
> > +{
> > + switch (mutex_trylock_recursive(m)) {
> > + default:
> > + case MUTEX_TRYLOCK_FAILED:
> > + mutex_lock_nested(m, I915_MM_SHRINKER);
>
> Worth using killable and refactoring the caller to handle the failure?
> If this path ends up deadlocking one day it would be slightly better
> that the process can be removed.
Good call.
-Chris
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