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linux/arch/arc
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Alexey Brodkin 645177f349 ARC: fix page address calculation if PAGE_OFFSET != LINUX_LINK_BASE 
commit 06f34e1c28 upstream.

We used to calculate page address differently in 2 cases:

1. In virt_to_page(x) we do
 --->8---
 mem_map + (x - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT
 --->8---

2. In in pte_page(x) we do
 --->8---
 mem_map + (pte_val(x) - PAGE_OFFSET) >> PAGE_SHIFT
 --->8---

That leads to problems in case PAGE_OFFSET != CONFIG_LINUX_LINK_BASE -
different pages will be selected depending on where and how we calculate
page address.

In particular in the STAR 9000853582 when gdb attempted to read memory
of another process it got improper page in get_user_pages() because this
is exactly one of the places where we search for a page by pte_page().

The fix is trivial - we need to calculate page address similarly in both
cases.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-03-06 14:43:31 -08:00
..
boot ARC: [nsimosci] move peripherals to match model to FPGA 2015-01-27 08:18:54 -08:00
configs ARC: [nsimosci] Unbork console 2014-04-14 06:50:05 -07:00
include ARC: fix page address calculation if PAGE_OFFSET != LINUX_LINK_BASE 2015-03-06 14:43:31 -08:00
kernel ARC: Fix build breakage for !CONFIG_ARC_DW2_UNWIND 2015-01-29 17:40:50 -08:00
lib ARC: switch to generic ENTRY/END assembler annotations 2015-01-27 08:18:54 -08:00
mm ARC: switch to generic ENTRY/END assembler annotations 2015-01-27 08:18:54 -08:00
oprofile ARC: OProfile support 2013-02-15 23:16:00 +05:30
plat-arcfpga ARC: Remove ARC_HAS_COH_RTSC 2014-05-13 13:32:49 +02:00
plat-tb10x ARC: [TB10x] Updates for GPIO and pinctrl 2013-11-11 09:57:44 +05:30
Kbuild ARC: Build system: Makefiles, Kconfig, Linker script 2013-02-11 20:00:25 +05:30
Kconfig ARC changes for 3.14 2014-01-25 10:50:43 -08:00
Kconfig.debug consolidate per-arch stack overflow debugging options 2013-07-04 11:25:39 -07:00
Makefile ARC: Adjustments for gcc 4.8 2013-06-27 14:35:32 +05:30