Source of cma.c - linux-imx - PHYTEC BitBucket (Stash)

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    } else {
        phys_addr_t addr = 0;
​
        /*
         * All pages in the reserved area must come from the same zone.
         * If the requested region crosses the low/high memory boundary,
         * try allocating from high memory first and fall back to low
         * memory in case of failure.
         */
        if (base < highmem_start && limit > highmem_start) {
            addr = memblock_alloc_range(size, alignment,
                            highmem_start, limit,
                            MEMBLOCK_NONE);
            addr = memblock_phys_alloc_range(size, alignment,
                             highmem_start, limit);
            limit = highmem_start;
        }
​
        if (!addr) {
            addr = memblock_alloc_range(size, alignment, base,
                            limit,
                            MEMBLOCK_NONE);
            addr = memblock_phys_alloc_range(size, alignment, base,
                             limit);
            if (!addr) {
                ret = -ENOMEM;
                goto err;
            }
        }
​
        /*
         * kmemleak scans/reads tracked objects for pointers to other
         * objects but this address isn't mapped and accessible
         */