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linux-next/arch/arc
Alexey Brodkin 06f34e1c28 ARC: fix page address calculation if PAGE_OFFSET != LINUX_LINK_BASE
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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-02-13 18:01:12 +05:30
..
boot ARC: [nsimosci] move peripherals to match model to FPGA 2014-12-15 11:24:58 +05:30
configs ARC: rename default defconfig 2014-12-17 15:23:56 +05:30
include ARC: fix page address calculation if PAGE_OFFSET != LINUX_LINK_BASE 2015-02-13 18:01:12 +05:30
kernel ARC: Fix earlycon build breakage 2015-02-04 10:38:15 +05:30
lib ARC: switch to generic ENTRY/END assembler annotations 2014-03-26 14:31:28 +05:30
mm ARC: boot: cpu feature print enhancements 2014-10-13 14:46:22 +05:30
oprofile ARC: OProfile support 2013-02-15 23:16:00 +05:30
plat-arcfpga ARC: [arcfpga] Get rid of ARC_BOARD_ANGEL4 and ARC_BOARD_ML509 2014-10-13 14:46:14 +05:30
plat-tb10x ARC: [plat*] move code out of .init_machine into common 2014-10-13 14:46:13 +05:30
Kbuild ARC: Build system: Makefiles, Kconfig, Linker script 2013-02-11 20:00:25 +05:30
Kconfig ARC: add power management options 2014-11-03 18:05:43 +05:30
Kconfig.debug consolidate per-arch stack overflow debugging options 2013-07-04 11:25:39 -07:00
Makefile ARC: rename default defconfig 2014-12-17 15:23:56 +05:30