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Several GPU SVM paths take mmap_read_lock() only to call hmm_range_fault() and open-code mmu interval sequence setup before each HMM walk. They also retry -EBUSY until HMM_RANGE_DEFAULT_TIMEOUT expires. Use hmm_range_fault_unlocked_timeout() for those faults. The HMM helper now owns mmap_lock acquisition and refreshes range->notifier_seq for its internal retries, while GPU SVM keeps its existing driver-lock validation with mmu_interval_read_retry() after a successful fault. drm_gpusvm_scan_mm() and drm_gpusvm_range_evict() pass HMM_RANGE_DEFAULT_TIMEOUT as the helper retry budget for each HMM fault attempt. drm_gpusvm_get_pages() keeps its existing absolute outer deadline because it can be reached from GPU page-fault workers, where fatal signals from the faulting process cannot stop an endless invalidation retry loop. It passes the remaining time from that deadline to HMM for each fault attempt. Leave drm_gpusvm_check_pages() on hmm_range_fault() because that path is called with the mmap lock already held by its caller. Link: https://lore.kernel.org/20260723-hmm-v10-v11-8-c55b003a4b61@gmail.com Signed-off-by: Stanislav Kinsburskii <skinsburskii@gmail.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Cc: Danilo Krummrich <dakr@kernel.org> Cc: Dave Airlie <airlied@gmail.com> Cc: David Hildenbrand <david@kernel.org> Cc: Dexuan Cui <decui@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: K. Y. Srinivasan <kys@microsoft.com> Cc: Leon Romanovsky <leon@kernel.org> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lizhi Hou <lizhi.hou@amd.com> Cc: Long Li <longli@microsoft.com> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Lyude <lyude@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oded Gabbay <ogabbay@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Zimemrmann <tzimmermann@suse.de> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Wei Liu <wei.liu@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>