From: Richard Weinberger <richard@nod.at>
Date: Sat, 14 Apr 2012 15:29:30 +0000 (+0200)
Subject: um: Implement a custom pte_same() function
X-Git-Tag: v3.2.19~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e22b65022898e212f80ca989e613179e318b8a79;p=pandora-kernel.git

um: Implement a custom pte_same() function

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 <hughd@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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