This is a note to let you know that I've just added the patch titled
um: Implement a custom pte_same() function
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
um-implement-a-custom-pte_same-function.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f15b9000eb1d09bbaa4b0a6b2089d7e1f64e84b3 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <[email protected]>
Date: Sat, 14 Apr 2012 17:29:30 +0200
Subject: um: Implement a custom pte_same() function
From: Richard Weinberger <[email protected]>
commit f15b9000eb1d09bbaa4b0a6b2089d7e1f64e84b3 upstream.
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.
Analyzed-by: Hugh Dickins <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/um/include/asm/pgtable.h | 6 ++++++
1 file changed, 6 insertions(+)
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -273,6 +273,12 @@ static inline void set_pte(pte_t *pteptr
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t pte_a, pte_t pte_b)
+{
+ return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE);
+}
+
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/um-fix-__swp_type.patch
queue-3.4/um-implement-a-custom-pte_same-function.patch
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