linux-stable.git/arch/mips, branch v3.15.2

MIPS: KVM: Allocate at least 16KB for exception handlers

2014-06-26T19:17:34+00:00

commit 7006e2dfda9adfa40251093604db76d7e44263b3 upstream.

Each MIPS KVM guest has its own copy of the KVM exception vector. This
contains the TLB refill exception handler at offset 0x000, the general
exception handler at offset 0x180, and interrupt exception handlers at
offset 0x200 in case Cause_IV=1. A common handler is copied to offset
0x2000 and offset 0x3000 is used for temporarily storing k1 during entry
from guest.

However the amount of memory allocated for this purpose is calculated as
0x200 rounded up to the next page boundary, which is insufficient if 4KB
pages are in use. This can lead to the common handler at offset 0x2000
being overwritten and infinitely recursive exceptions on the next exit
from the guest.

Increase the minimum size from 0x200 to 0x4000 to cover the full use of
the page.

Signed-off-by: James Hogan 
Cc: Paolo Bonzini 
Cc: Gleb Natapov 
Cc: kvm@vger.kernel.org
Cc: Ralf Baechle 
Cc: linux-mips@linux-mips.org
Cc: Sanjay Lal 
Signed-off-by: Paolo Bonzini 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

2014-06-02T01:28:58+00:00

Pull MIPS fixes from Ralf Baechle:
 "A fair number of fixes across the field.  Nothing terribly
  complicated; the one liners in below changelog should be fairly
  descriptive.

  Noteworthy is the SB1 change which the result of changes to binutils
  resulting in one big gas warning for most files being assembled as
  well as the asid_cache and branch emulation fixes which fix corruption
  or possible uninteded behaviour of kernel or application code.  The
  remainder of fixes are more platforms or subsystem specific"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: R46000: Fix Micro-assembler field overflow for R4600 V2
  MIPS: ptrace: Avoid smp_processor_id() in preemptible code
  MIPS: Lemote 2F: cs5536: mfgpt: use raw locks
  MIPS: SB1: Fix excessive kernel warnings.
  MIPS: RC32434: fix broken PCI resource initialization
  MIPS: malta: memory.c: Initialize the 'memsize' variable
  MIPS: Fix typo when reporting cache and ftlb errors for ImgTec cores
  MIPS: Fix inconsistancy of __NR_Linux_syscalls value
  MIPS: Fix branch emulation of branch likely instructions.
  MIPS: Fix a typo error in AUDIT_ARCH definition
  MIPS: Change type of asid_cache to unsigned long

MIPS: R46000: Fix Micro-assembler field overflow for R4600 V2

2014-05-28T09:08:14+00:00

Fix uasm warning, which triggered because of workaround for R4600 V2 CPUs.

Signed-off-by: Thomas Bogendoerfer 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6716/
Signed-off-by: Ralf Baechle

MIPS: ptrace: Avoid smp_processor_id() in preemptible code

2014-05-28T08:54:41+00:00

ptrace_{get,set}_watch_regs access current_cpu_data to get the watch
register count/masks, which calls smp_processor_id(). However they are
run in preemptible context and therefore trigger warnings like so:

[ 6340.092000] BUG: using smp_processor_id() in preemptible [00000000] code: gdb/367
[ 6340.092000] caller is ptrace_get_watch_regs+0x44/0x220

Since the watch register count/masks should be the same across all
CPUs, use boot_cpu_data instead. Note that this may need to change in
future should a heterogenous system be supported where the count/masks
are not the same across all CPUs (the current code is also incorrect
for this scenario - current_cpu_data here would not necessarily be
correct for the CPU that the target task will execute on).

Signed-off-by: Alex Smith 
Reviewed-by: Paul Burton 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6879/
Signed-off-by: Ralf Baechle

MIPS: Lemote 2F: cs5536: mfgpt: use raw locks

2014-05-28T08:48:26+00:00

The lock is taken in the raw irq path and therefore a rawlock should be
used instead of a normal spinlock.
While here I drop the export symbol on that variable since there are no
other users.

Signed-off-by: Sebastian Andrzej Siewior 
Cc: linux-mips@linux-mips.org
Cc: Hua Yan 
Cc: Huacai Chen 
Cc: Alex Smith 
Cc: Hongliang Tao 
Cc: Wu Zhangjin 
Patchwork: https://patchwork.linux-mips.org/patch/6936/
Signed-off-by: Ralf Baechle

MIPS: SB1: Fix excessive kernel warnings.

2014-05-28T06:42:23+00:00

A kernel build with binutils 2.24 is going to emit warnings like

  CC      kernel/sys.o
{standard input}: Assembler messages:
{standard input}:701: Warning: the 32-bit MIPS architecture does not support the `mdmx' extension
{standard input}:701: Warning: the `mdmx' extension requires 64-bit FPRs
{standard input}:701: Warning: the `mips3d' extension requires MIPS32 revision 2 or greater
{standard input}:701: Warning: the `mips3d' extension requires 64-bit FPRs

for almost every file.  This is caused by changes to gas' interpretation
of .set semantics.  Fixed by explicitly disabling MIPS3D and MDMX for
Sibyte builds.

Signed-off-by: Ralf Baechle

MIPS: RC32434: fix broken PCI resource initialization

2014-05-26T07:02:06+00:00

The parent field of the 'rc32434_res_pci_mem1' resource points to
the resource itself which is obviously wrong. Due to the broken
initialitazion, the PCI devices on the Mikrotik RB532 boards are
not working since commit 22283178 (MIPS: avoid possible resource
conflict in register_pci_controller).

Remove the field initialization to fix the issue.

Signed-off-by: Gabor Juhos 
Reported-by: Waldemar Brodkorb 
Cc: linux-mips@linux-mips.org
Cc: Gabor Juhos 
Patchwork: https://patchwork.linux-mips.org/patch/6940/
Signed-off-by: Ralf Baechle

MIPS: malta: memory.c: Initialize the 'memsize' variable

2014-05-25T10:46:24+00:00

If the 'memsize' environmental variable is not set by the bootloader
the 'memsize' variable is not initialized, leading to potential memory
problems. This patch fixes the problem by setting the initial
value to '0' to force the kernel to set a good default memory size.

Cc:  # v3.15+
Reported-by: Matheus Almeida 
Signed-off-by: Markos Chandras 
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras 
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/6984/
Signed-off-by: Ralf Baechle

MIPS: Fix typo when reporting cache and ftlb errors for ImgTec cores

2014-05-25T10:45:06+00:00

Introduced by the following two commits:
75b5b5e0a262790fa11043fe45700499c7e3d818
"MIPS: Add support for FTLBs"
6de20451857ed14a4eecc28d08f6de5925d1cf96
"MIPS: Add printing of ES bit for Imgtec cores when cache error occurs"

Signed-off-by: Markos Chandras 
Reported-by: Matheus Almeida 
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras 
Cc: stable@vger.kernel.org # v3.14+
Patchwork: https://patchwork.linux-mips.org/patch/6980/
Signed-off-by: Ralf Baechle

MIPS: Fix inconsistancy of __NR_Linux_syscalls value

2014-05-25T10:43:26+00:00

Originally, __NR_O32_Linux_syscalls, __NR_N32_Linux_syscalls and
__NR_64_Linux_syscalls have the same values as __NR_Linux_syscalls in
corresponding ABIs. But after commit 367f0b50e502d (MIPS: Wire up
renameat2 syscall) they are not the same. I think this is incorrect and
need a fix.

Signed-off-by: Huacai Chen 
Cc: John Crispin 
Cc: Steven J. Hill 
Cc: Aurelien Jarno 
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Patchwork: https://patchwork.linux-mips.org/patch/6987/
Signed-off-by: Ralf Baechle