riscv: Support allocating gigantic hugepages using CMA
This patch adds support to allocate gigantic hugepages using CMA by specifying the hugetlb_cma= kernel parameter. This is only supported on RV64. Reviewed-by: Alexandre Ghiti <alex@ghiti.fr> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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