From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Tue, 3 Apr 2012 17:05:47 +0000 (+0100)
Subject: xen/gntdev: do not set VM_PFNMAP
X-Git-Tag: v3.2.17~160
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=25a873a89ffb910c5a28fe792b008e6a93d99242;hp=25a873a89ffb910c5a28fe792b008e6a93d99242

xen/gntdev: do not set VM_PFNMAP

commit e8e937be971d706061dc56220ff3605ab77622a7 upstream.

Since we are using the m2p_override we do have struct pages
corresponding to the user vma mmap'ed by gntdev.

Removing the VM_PFNMAP flag makes get_user_pages work on that vma.
An example test case would be using a Xen userspace block backend
(QDISK) on a file on NFS using O_DIRECT.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---