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Fri, 10 Jul 2026 09:43:12 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wiEJj-00000007Yof-1AFg; Fri, 10 Jul 2026 13:43:11 -0300 Date: Fri, 10 Jul 2026 13:43:11 -0300 From: Jason Gunthorpe To: Stanislav Kinsburskii Cc: airlied@gmail.com, akhilesh@ee.iitb.ac.in, akpm@linux-foundation.org, corbet@lwn.net, dakr@kernel.org, david@kernel.org, decui@microsoft.com, haiyangz@microsoft.com, kees@kernel.org, kys@microsoft.com, leon@kernel.org, liam@infradead.org, lizhi.hou@amd.com, ljs@kernel.org, longli@microsoft.com, lyude@redhat.com, maarten.lankhorst@linux.intel.com, mamin506@gmail.com, mhocko@suse.com, mripard@kernel.org, nouveau@lists.freedesktop.org, ogabbay@kernel.org, oleg@redhat.com, rppt@kernel.org, shuah@kernel.org, simona@ffwll.ch, skhan@linuxfoundation.org, surenb@google.com, tzimmermann@suse.de, vbabka@kernel.org, wei.liu@kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-rdma@vger.kernel.org Subject: Re: [PATCH v7 6/8] RDMA/umem: Use hmm_range_fault_unlocked_timeout() for ODP faults Message-ID: <20260710164311.GU118978@ziepe.ca> References: <178345345668.660027.2952911919681614557.stgit@skinsburskii> <178345364975.660027.8790629832830633290.stgit@skinsburskii> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <178345364975.660027.8790629832830633290.stgit@skinsburskii> On Tue, Jul 07, 2026 at 12:47:29PM -0700, Stanislav Kinsburskii wrote: > ib_umem_odp_map_dma_and_lock() takes mmap_read_lock() only around > hmm_range_fault(), then retries -EBUSY until HMM_RANGE_DEFAULT_TIMEOUT > expires. > > Use hmm_range_fault_unlocked_timeout() instead. The HMM helper now owns > the mmap lock and refreshes range->notifier_seq for its internal retries. > ODP keeps using HMM_RANGE_DEFAULT_TIMEOUT for each HMM fault attempt, > while interval invalidation retries continue to be handled by the existing > outer loop. > > ODP still validates the interval notifier sequence while holding umem_mutex > before DMA mapping pages. > > Signed-off-by: Stanislav Kinsburskii > --- > drivers/infiniband/core/umem_odp.c | 18 +++++------------- > 1 file changed, 5 insertions(+), 13 deletions(-) Reviewed-by: Jason Gunthorpe Jason