linux-toradex.git/arch/arm/kernel, branch v3.2.4-rt10

ARM: Initialize ptl->lock for vector page

2012-01-16T19:00:18+00:00

Without this patch, ARM can not use SPLIT_PTLOCK_CPUS if
PREEMPT_RT_FULL=y because vectors_user_mapping() creates a
VM_ALWAYSDUMP mapping of the vector page (address 0xffff0000), but no
ptl->lock has been allocated for the page.  An attempt to coredump
that page will result in a kernel NULL pointer dereference when
follow_page() attempts to lock the page.

The call tree to the NULL pointer dereference is:

   do_notify_resume()
      get_signal_to_deliver()
         do_coredump()
            elf_core_dump()
               get_dump_page()
                  __get_user_pages()
                     follow_page()
                        pte_offset_map_lock() <----- a #define
                           ...
                              rt_spin_lock()

The underlying problem is exposed by mm-shrink-the-page-frame-to-rt-size.patch.

Signed-off-by: Frank Rowand 
Cc: Frank 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/4E87C535.2030907@am.sony.com
Signed-off-by: Thomas Gleixner

early-printk-consolidate.patch

2012-01-16T19:00:12+00:00

Signed-off-by: Thomas Gleixner

sched: Use schedule_preempt_disabled()

2012-01-16T19:00:05+00:00

Coccinelle based conversion.

Signed-off-by: Thomas Gleixner

arm: Mark pmu interupt IRQF_NO_THREAD

2012-01-16T19:00:05+00:00

PMU interrupt must not be threaded. Remove IRQF_DISABLED while at it
as we run all handlers with interrupts disabled anyway.

Signed-off-by: Thomas Gleixner

arm-enable-interrupts-in-signal-code.patch

2012-01-16T19:00:03+00:00

Signed-off-by: Thomas Gleixner

ARM: unwinder: fix bisection to find origin in .idx section

2011-12-15T22:02:19+00:00

The bisection implemented in unwind_find_origin() stopped to early.  If
there is only a single entry left to check the original code just took
the end point as origin which might be wrong.

This was introduced in commit de66a979012d ("ARM: 7187/1: fix unwinding
for XIP kernels").

Reported-and-tested-by: Nick Bowler 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Linus Torvalds

ARM: 7204/1: arch/arm/kernel/setup.c: initialize arm_dma_zone_size earlier

2011-12-11T22:42:01+00:00

arm_dma_zone_size is used by arm_bootmem_free() which is called by
paging_init(). Thus it needs to be set before calling it.

Signed-off-by: Arnaud Patard 
Acked-by: Nicolas Pitre 
Cc: stable@kernel.org
Signed-off-by: Russell King

ARM: 7185/1: perf: don't assign platform_device on unsupported CPUs

2011-12-06T12:48:01+00:00

In the unlikely case that a platform registers a PMU platform_device
when running on a CPU that is unsupported by perf, we will encounter a
NULL dereference when trying to assign the platform_device to the
cpu_pmu structure.

This patch checks that the CPU is supported by perf before assigning
the platform_device.

Reported-by: Pawel Moll 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 7187/1: fix unwinding for XIP kernels

2011-12-06T11:16:13+00:00

The linker places the unwind tables in readonly sections. So when using
an XIP kernel these are located in ROM and cannot be modified.
For that reason the current approach to convert the relative offsets in
the unwind index to absolute addresses early in the boot process doesn't
work with XIP.

The offsets in the unwind index section are signed 31 bit numbers and
the structs are sorted by this offset. So it first has offsets between
0x40000000 and 0x7fffffff (i.e. the negative offsets) and then offsets
between 0x00000000 and 0x3fffffff. When seperating these two blocks the
numbers are sorted even when interpreting the offsets as unsigned longs.

So determine the first non-negative entry once and track that using the
new origin pointer. The actual bisection can then use a plain unsigned
long comparison. The only thing that makes the new bisection more
complicated is that the offsets are relative to their position in the
index section, so the key to search needs to be adapted accordingly in
each step.

Moreover several consts are added to catch future writes and rename the
member "addr" of struct unwind_idx to "addr_offset" to better match the
new semantic. (This has the additional benefit of breaking eventual
users at compile time to make them aware of the change.)

In my tests the new algorithm was a tad faster than the original and has
the additional upside of not needing the initial conversion and so saves
some boot time and it's possible to unwind even earlier.

Acked-by: Catalin Marinas 
Acked-by: Nicolas Pitre 
Signed-off-by: Uwe Kleine-König 
Signed-off-by: Russell King

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2011-12-06T00:54:00+00:00

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix loss of notification with multi-event
  perf, x86: Force IBS LVT offset assignment for family 10h
  perf, x86: Disable PEBS on SandyBridge chips
  trace_events_filter: Use rcu_assign_pointer() when setting ftrace_event_call->filter
  perf session: Fix crash with invalid CPU list
  perf python: Fix undefined symbol problem
  perf/x86: Enable raw event access to Intel offcore events
  perf: Don't use -ENOSPC for out of PMU resources
  perf: Do not set task_ctx pointer in cpuctx if there are no events in the context
  perf/x86: Fix PEBS instruction unwind
  oprofile, x86: Fix crash when unloading module (nmi timer mode)
  oprofile: Fix crash when unloading module (hr timer mode)