From: Peter Zijlstra
Manage the VMAs with SRCU such that we can do a lockless VMA lookup.
We put the fput(vma->vm_file) in the SRCU callback, this keeps files
valid during speculative faults, this is possible due to the delayed
fput work by Al Viro -- do we need
From: Peter Zijlstra
Manage the VMAs with SRCU such that we can do a lockless VMA lookup.
We put the fput(vma->vm_file) in the SRCU callback, this keeps files
valid during speculative faults, this is possible due to the delayed
fput work by Al Viro -- do we need srcu_barrier() in unmount
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