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Koen Kooi
646ff9d602
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
42 lines
1.4 KiB
Diff
42 lines
1.4 KiB
Diff
From ed8e2c17d62006fb136c30abeb552673727c5eee Mon Sep 17 00:00:00 2001
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From: Richard Weinberger <richard@nod.at>
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Date: Sat, 14 Apr 2012 17:29:30 +0200
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Subject: [PATCH 067/117] um: Implement a custom pte_same() function
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commit f15b9000eb1d09bbaa4b0a6b2089d7e1f64e84b3 upstream.
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UML uses the _PAGE_NEWPAGE flag to mark pages which are not jet
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installed on the host side using mmap().
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pte_same() has to ignore this flag, otherwise unuse_pte_range()
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is unable to unuse the page because two identical
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page tables entries with different _PAGE_NEWPAGE flags would not
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match and swapoff() would never return.
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Analyzed-by: Hugh Dickins <hughd@google.com>
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Signed-off-by: Richard Weinberger <richard@nod.at>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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arch/um/include/asm/pgtable.h | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
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index 41474fb..0fea0ec 100644
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--- a/arch/um/include/asm/pgtable.h
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+++ b/arch/um/include/asm/pgtable.h
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@@ -271,6 +271,12 @@ 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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/*
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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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--
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1.7.9.5
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