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arm64: hugetlb: set_huge_pte_at Add WARN_ON on !pte_present
This patch adds a WARN_ON to set_huge_pte_at as the accessor assumes that entries to be written down are all present. (There are separate accessors to clear huge ptes). We will need to handle the !pte_present case where memory offlining is used on hugetlb pages. swap and migration entries will be supplied to set_huge_pte_at in this case. Cc: David Woods <dwoods@mellanox.com> Signed-off-by: Steve Capper <steve.capper@arm.com> Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -67,6 +67,12 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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unsigned long pfn;
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pgprot_t hugeprot;
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/*
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* Code needs to be expanded to handle huge swap and migration
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* entries. Needed for HUGETLB and MEMORY_FAILURE.
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*/
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WARN_ON(!pte_present(pte));
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if (!pte_cont(pte)) {
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set_pte_at(mm, addr, ptep, pte);
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return;
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