From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2BF27444719 for ; Wed, 22 Jul 2026 22:49:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784760565; cv=none; b=KXkDZzygMPoEc/WDy04ECqdPUZgsoeL6UmCQLyn6mSf3jtM1L6hkOGPO+mL+Vbwv7Tx8t1pQXWhnBeQ2ogEHSgfvodG+RvJNags4d5PiyeMRujbB8gtuoPjlsiuP2AaEpkkqoBGiFVgKg2DJ9FqQMwiMgcgeyXRMqIoCkaE3aKw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784760565; c=relaxed/simple; bh=QIfrtEgh0q7RrwmjuN+qUGBXqCUxnMFhlxIotPks+SE=; h=Date:To:From:Subject:Message-Id; b=sxSx9qpmsf8nWm9M1OyhrgSkWf3zWgV3F7Y4v7hN+L3rLR3Ew8BQHPrY90JG8TuoO8xcoj9sbJrJBT6QmbCUTL5bTJ7EJ1K3t4y7SZjbMIm08on7haWT0aRNuGshCm+jqv1TEetBnGB4D56Tec/MLxjzZcgUpa/qmcfuDP1jj5E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=X+VwSwg7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="X+VwSwg7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B67EE1F000E9; Wed, 22 Jul 2026 22:49:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1784760563; bh=2bEvYWqneXZ8jU7J3UjrEjAqBkD1YwRH0+nJkax7qSU=; h=Date:To:From:Subject; b=X+VwSwg7vxYg4vBTVnjXAjeQmbLveONKsBJ4KmPcseecsLTPI1P5Hpjt3a/+nwc72 Yif1vSdroISPxOaWFBulQeUGkJYnbksvfqW6dJCCD50igwsnLhF47r26UX992RTlj3 Lms2zPrZhzfAi3nOEc132rq8HerkQrJn+w3zBp44= Date: Wed, 22 Jul 2026 15:49:23 -0700 To: mm-commits@vger.kernel.org,skinsburskii@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: + rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults.patch added to mm-unstable branch Message-Id: <20260722224923.B67EE1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: RDMA/umem: use hmm_range_fault_unlocked_timeout() for ODP faults has been added to the -mm mm-unstable branch. Its filename is rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Stanislav Kinsburskii Subject: RDMA/umem: use hmm_range_fault_unlocked_timeout() for ODP faults Date: Wed, 22 Jul 2026 14:44:28 -0700 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. Link: https://lore.kernel.org/20260722-hmm-v10-v1-6-606464dd601a@gmail.com Signed-off-by: Stanislav Kinsburskii Reviewed-by: Jason Gunthorpe Cc: Danilo Krummrich Cc: Dave Airlie Cc: David Hildenbrand Cc: Dexuan Cui Cc: Haiyang Zhang Cc: Jonathan Corbet Cc: K. Y. Srinivasan Cc: Leon Romanovsky Cc: Liam R. Howlett Cc: Lizhi Hou Cc: Long Li Cc: Lorenzo Stoakes Cc: Lyude Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Michal Hocko Cc: Mike Rapoport Cc: Oded Gabbay Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Thomas Zimemrmann Cc: Vlastimil Babka Cc: Wei Liu Signed-off-by: Andrew Morton --- drivers/infiniband/core/umem_odp.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) --- a/drivers/infiniband/core/umem_odp.c~rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults +++ a/drivers/infiniband/core/umem_odp.c @@ -329,7 +329,7 @@ int ib_umem_odp_map_dma_and_lock(struct struct mm_struct *owning_mm = umem_odp->umem.owning_mm; int pfn_index, dma_index, ret = 0, start_idx; unsigned int page_shift, hmm_order, pfn_start_idx; - unsigned long num_pfns, current_seq; + unsigned long num_pfns; struct hmm_range range = {}; unsigned long timeout; @@ -363,26 +363,18 @@ int ib_umem_odp_map_dma_and_lock(struct } range.hmm_pfns = &(umem_odp->map.pfn_list[pfn_start_idx]); - timeout = jiffies + msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT); + timeout = msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT); retry: - current_seq = range.notifier_seq = - mmu_interval_read_begin(&umem_odp->notifier); - - mmap_read_lock(owning_mm); - ret = hmm_range_fault(&range); - mmap_read_unlock(owning_mm); - if (unlikely(ret)) { - if (ret == -EBUSY && !time_after(jiffies, timeout)) - goto retry; + ret = hmm_range_fault_unlocked_timeout(&range, timeout); + if (unlikely(ret)) goto out_put_mm; - } start_idx = (range.start - ib_umem_start(umem_odp)) >> page_shift; dma_index = start_idx; mutex_lock(&umem_odp->umem_mutex); - if (mmu_interval_read_retry(&umem_odp->notifier, current_seq)) { + if (mmu_interval_read_retry(&umem_odp->notifier, range.notifier_seq)) { mutex_unlock(&umem_odp->umem_mutex); goto retry; } _ Patches currently in -mm which might be from skinsburskii@gmail.com are mm-hmm-move-page-fault-handling-out-of-walk-callbacks.patch mm-hmm-add-hmm_range_fault_unlocked_timeout-for-mmap-lock-drop-support.patch selftests-mm-add-hmm-test-for-mmap-lock-dropping-faults.patch mshv-use-hmm_range_fault_unlocked_timeout-for-region-faults.patch drm-nouveau-use-hmm_range_fault_unlocked_timeout-for-svm-faults.patch rdma-umem-use-hmm_range_fault_unlocked_timeout-for-odp-faults.patch accel-amdxdna-use-hmm_range_fault_unlocked_timeout-for-range-population.patch drm-gpusvm-use-hmm_range_fault_unlocked_timeout-for-range-faults.patch