From: Linus Torvalds <torvalds@g5.osdl.org>
Date: Mon, 12 Dec 2005 04:38:17 +0000 (-0800)
Subject: Allow arbitrary read-only shared pfn-remapping too
X-Git-Tag: v2.6.15-rc6~144
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67121172f9753f38689651b613a4850e0e75876f;p=pandora-kernel.git

Allow arbitrary read-only shared pfn-remapping too

The VM layer (for historical reasons) turns a read-only shared mmap into
a private-like mapping with the VM_MAYWRITE bit clear.  Thus checking
just VM_SHARED isn't actually sufficient.

So use a trivial helper function for the cases where we wanted to inquire
if a mapping was COW-like or not.

Moo!

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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