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SubjectRe: [PATCH 1/2] drm/i915: Preallocate our mmu notifier workequeu to unbreak cpu hotplug deadlock
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Quoting Daniel Vetter (2017-10-06 10:06:36)
> 4.14-rc1 gained the fancy new cross-release support in lockdep, which
> seems to have uncovered a few more rules about what is allowed and
> isn't.
>
> This one here seems to indicate that allocating a work-queue while
> holding mmap_sem is a no-go, so let's try to preallocate it.

But you haven't mentioned why we might want to preallocate to reduce the
mmap/mm_lock coverage anyway.
-Chris

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