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The CMA code, in addition to the reserved-memory regions in the device tree, will also register a default CMA region if the device tree doesn't provide any, with its size and position coming from either the kernel command-line or configuration. Let's register that one for use to create a heap for it. Reviewed-by: T.J. Mercier <tjmercier@google.com> Signed-off-by: Maxime Ripard <mripard@kernel.org> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://lore.kernel.org/r/20251013-dma-buf-ecc-heap-v8-4-04ce150ea3d9@kernel.org