arm64/hugetlb: fix CMA gigantic page order for non-4K PAGE_SIZE
commit 2e5809a4 upstream. For non-4K PAGE_SIZE configs, the largest gigantic huge page size is CONT_PMD_SHIFT order. On arm64 with 64K PAGE_SIZE, the gigantic page is 16G. Therefore, one should be able to specify 'hugetlb_cma=16G' on the kernel command line so that one gigantic page can be allocated from CMA. However, when adding such an option the following message is produced: hugetlb_cma: cma area should be at least 8796093022208 MiB This is because the calculation for non-4K gigantic page order is incorrect in the arm64 specific routine arm64_hugetlb_cma_reserve(). Fixes: abb7962a ("arm64/hugetlb: Reserve CMA areas for gigantic pages on 16K and 64K configs") Cc: <stable@vger.kernel.org> # 5.9.x Signed-off-by:Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by:
Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lore.kernel.org/r/20211005202529.213812-1-mike.kravetz@oracle.com Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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0c970088
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