Re: [PATCH v4 07/38] mm: add mmap action for discontiguous kernel page mapping
flat view
From: sashiko-bot@kernel.org
Date: 2026-10-03 17:56:49
Also in:
bpf, dri-devel, kvm, kvmarm, linux-perf-users, linux-rdma, linux-s390, linux-scsi, selinux
The existing kernel page mapping mmap actions allow for partial and full mapping of an array of struct page pointers. However some drivers require the mapping of discontiguous ranges. Permit this by providing discontig_kernel_page_ops which allows a driver to specify how the operation should begin and how batches of pages should be retrieved. It uses the minimum exposed interface to do so, providing address, page offset and both vm_private_data state and a local private state object. ops->init can establish state for the operation, and ops->get outputs the pages to map and their count. Should an error arise the core unmaps the VMA, invoking vm_ops->close, which is therefore where any state established by ops->init is released. [ ... ] The userland VMA tests are updated accordingly. Acked-by: Zi Yan <ziy@nvidia.com> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great! -- Sashiko AI review · https://sashiko.dev/#/patchset/20261003-b4-mmap-prepare-vma-flag-sanify-v4-0-a1f052500fd7@kernel.org?part=7