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f25a546e65
Replace the internal interval tree based mmu notifier with the new common
mmu_interval_notifier_insert() API. This removes a lot of code and fixes a
deadlock that can be triggered in ODP:
zap_page_range()
mmu_notifier_invalidate_range_start()
[..]
ib_umem_notifier_invalidate_range_start()
down_read(&per_mm->umem_rwsem)
unmap_single_vma()
[..]
__split_huge_page_pmd()
mmu_notifier_invalidate_range_start()
[..]
ib_umem_notifier_invalidate_range_start()
down_read(&per_mm->umem_rwsem) // DEADLOCK
mmu_notifier_invalidate_range_end()
up_read(&per_mm->umem_rwsem)
mmu_notifier_invalidate_range_end()
up_read(&per_mm->umem_rwsem)
The umem_rwsem is held across the range_start/end as the ODP algorithm for
invalidate_range_end cannot tolerate changes to the interval
tree. However, due to the nested invalidation regions the second
down_read() can deadlock if there are competing writers. The new core code
provides an alternative scheme to solve this problem.
Fixes:
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.. | ||
ib.h | ||
ib_addr.h | ||
ib_cache.h | ||
ib_cm.h | ||
ib_fmr_pool.h | ||
ib_hdrs.h | ||
ib_mad.h | ||
ib_marshall.h | ||
ib_pack.h | ||
ib_pma.h | ||
ib_sa.h | ||
ib_smi.h | ||
ib_umem.h | ||
ib_umem_odp.h | ||
ib_verbs.h | ||
iw_cm.h | ||
iw_portmap.h | ||
mr_pool.h | ||
opa_addr.h | ||
opa_port_info.h | ||
opa_smi.h | ||
opa_vnic.h | ||
rdma_cm.h | ||
rdma_cm_ib.h | ||
rdma_counter.h | ||
rdma_netlink.h | ||
rdma_vt.h | ||
rdmavt_cq.h | ||
rdmavt_mr.h | ||
rdmavt_qp.h | ||
restrack.h | ||
rw.h | ||
signature.h | ||
tid_rdma_defs.h | ||
uverbs_ioctl.h | ||
uverbs_named_ioctl.h | ||
uverbs_std_types.h | ||
uverbs_types.h |