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Linux replaced the size argument to dmem_cgroup_register_region() with a dmem_cgroup_init pointer. Detect the signature and initialize the region size while retaining the original call on older kernels. Related Linux commits: e11640b9cea4 (cgroup/dmem: Introduce struct dmem_cgroup_init for region initialization)
Linux removed VM_SPECIAL and VMA_SPECIAL_FLAGS. Spell out the same four flags in the HMM migration exclusion check, preserving its existing behavior on kernels that still define the aggregate mask. Related Linux commits: 8cab8abf01e1 (mm: eliminate VM_SPECIAL, VMA_SPECIAL_FLAGS)
Linux renamed is_vm_hugetlb_page() to vma_is_hugetlb(). Use a declaration conftest to select the new helper without losing the existing helper on older kernels. Related Linux commits: 8d9cb659cbf2 (mm: rename is_vm_hugetlb_page() to vma_is_hugetlb())
Linux introduced plane atomic_create_state and subsequently removed the reset callback and helper. Detect the new callback, allocate the NVIDIA plane state, and initialize it with the renamed state helper. Leave state installation to DRM core and retain the legacy reset path. Related Linux commits: 1a185ddecaf9 (drm/plane: Add new atomic_create_state callback) 3e5656ea5e73 (drm/atomic-state-helper: Rename __drm_atomic_helper_plane_state_reset()) 5589ef09f93b (drm/plane: Remove reset) e62864df82f6 (drm/atomic-state-helper: Remove drm_atomic_helper_plane_reset())
Linux introduced CRTC atomic_create_state and subsequently removed the reset callback and helper. Detect the new callback, allocate the NVIDIA CRTC state, and initialize it with the renamed state helper. Leave state installation to DRM core and retain the legacy reset path. Related Linux commits: 58d426b5ed0d (drm/crtc: Add new atomic_create_state callback) 915fdd2c7e87 (drm/atomic-state-helper: Rename __drm_atomic_helper_crtc_state_reset()) f1bcb90506a9 (drm/crtc: Remove reset) 5354d1e5fba4 (drm/atomic-helper: Remove drm_atomic_helper_crtc_reset)
Linux moved and renamed drm_fb_helper.h to drm/clients/drm_fbdev_helper.h. Detect the new header and select it in the driver and all three fbdev setup probes, retaining the old header on older kernels. This prevents missing-header errors from being mistaken for presence of removed setup functions. Related Linux commits: 6ccc5b5fc1d3 (drm/fbdev: Move fbdev helpers into client library)
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Building NVIDIA 615.71.09 against linux-next
next-20261001fails after changes to dmem registration, HMM VMA helpers, DRM atomic state creation, and the fbdev helper header location. Add conftests that select the matching interfaces while retaining the existing paths for older kernels.dmem_cgroup_register_region()initializer argument and initialize the region size throughstruct dmem_cgroup_initwhen present.VM_SPECIALmask to its constituent flags and detect the renamedvma_is_hugetlb()helper.atomic_create_stateindependently. Allocate and initialize the NVIDIA state subclasses, return allocation errors, and let DRM core install the returned states. Preserve the existing reset callbacks for older kernels.drm/clients/drm_fbdev_helper.hand select it in both the driver and all three fbdev setup probes. This also prevents a missing old header from falsely reporting removed setup functions as present.The six compatibility commits follow independent Linux API changes. The plane and CRTC commit messages also reference the associated initializer renames and later reset removals.
Validation against upstream commit
61dcc93722ecb418bb5f2e00923f05b4b8051dd1(615.71.09), using GCC 16.2.1:6.18.54-2-lts7.2.8-arch1-27.3.0-rc5-next-20261001-1-next-git-13246-g9f24d789f03bEach build used a separate clean source copy. Splitting the history leaves the tested final source tree and aggregate diff unchanged. Module versions/vermagic match their targets. Independent conftest runs agree with the generated build headers: generic and TTM fbdev setup are absent, and client setup is present, on all three targets.
git diff --checkand shell syntax checks pass. Build logs contain compiler and objtool warnings.Validation covers compilation and capability detection. No new runtime graphics tests were performed, and kernels older than 6.18.54 were not built during this validation.