From: Simon Baatz <gmbnomis@gmail.com>
Date: Mon, 10 Jun 2013 20:10:12 +0000 (+0100)
Subject: ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
X-Git-Tag: v3.2.48~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa76cd49f117853eb06d3de8f343a99421d8ddc3;p=pandora-kernel.git

ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page

commit 1bc39742aab09248169ef9d3727c9def3528b3f3 upstream.

Commit f8b63c1 made flush_kernel_dcache_page a no-op assuming that
the pages it needs to handle are kernel mapped only.  However, for
example when doing direct I/O, pages with user space mappings may
occur.

Thus, continue to do lazy flushing if there are no user space
mappings.  Otherwise, flush the kernel cache lines directly.

Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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