From: Jonathan Austin <Jonathan.Austin@arm.com>
Date: Thu, 23 Aug 2012 13:02:59 +0000 (+0100)
Subject: ARM: 7499/1: mm: Fix vmalloc overlap check for !HIGHMEM
X-Git-Tag: v3.6-rc6~28^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=36418c516b31bff4ff949c7c618430a1a514debe;p=pandora-kernel.git

ARM: 7499/1: mm: Fix vmalloc overlap check for !HIGHMEM

With !HIGHMEM, sanity_check_meminfo checks for banks that completely or
partially overlap the vmalloc region. The test for partial overlap checks
__va(bank->start + bank->size) > vmalloc_min. This is not appropriate if
there is a non-linear translation between virtual and physical addresses,
as bank->start + bank->size is actually in the bank following the one being
interrogated.

In most cases, even when using SPARSEMEM, this is not problematic as the
subsequent bank will start at a higher va than the one in question. However
if the physical to virtual address conversion is not monotonic increasing,
the incorrect test could result in a bank not being truncated when it
should be.

This patch ensures we perform the va-pa conversion on memory from the
bank we are interested in, not the following one.

Reported-by: ??? (Steve) <zhanzhenbo@gmail.com>
Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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