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um: Implement a custom pte_same() function
UML uses the _PAGE_NEWPAGE flag to mark pages which are not jet installed on the host side using mmap(). pte_same() has to ignore this flag, otherwise unuse_pte_range() is unable to unuse the page because two identical page tables entries with different _PAGE_NEWPAGE flags would not match and swapoff() would never return. CC: stable@kernel.org Analyzed-by: Hugh Dickins <hughd@google.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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@ -273,6 +273,12 @@ static inline void set_pte(pte_t *pteptr, pte_t pteval)
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}
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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#define __HAVE_ARCH_PTE_SAME
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static inline int pte_same(pte_t pte_a, pte_t pte_b)
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{
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return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
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}
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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