]> git.baikalelectronics.ru Git - kernel.git/commit
ARM: 7499/1: mm: Fix vmalloc overlap check for !HIGHMEM
authorJonathan Austin <Jonathan.Austin@arm.com>
Thu, 23 Aug 2012 13:02:59 +0000 (14:02 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Sat, 25 Aug 2012 08:20:40 +0000 (09:20 +0100)
commit50fb3ab3a3fcf58d1d202b6dd6aecc490b923b60
treea17ddc5786e7761e0e9bd1668a4e4a6e4b48c8c0
parentb0a4bcc91f2973c97d79057706b6c2dbe8e80b6b
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>
arch/arm/mm/mmu.c