linux-toradex.git/arch/arm, branch v3.2.8-rt13

arm-disable-highmem-on-rt.patch

2012-02-15T16:33:01+00:00

Signed-off-by: Thomas Gleixner

ARM: Initialize ptl->lock for vector page

2012-02-15T16:32:43+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

2012-02-15T16:32:37+00:00

Signed-off-by: Thomas Gleixner

mm: pagefault_disabled()

2012-02-15T16:32:32+00:00

Wrap the test for pagefault_disabled() into a helper, this allows us
to remove the need for current->pagefault_disabled on !-rt kernels.

Signed-off-by: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-3yy517m8zsi9fpsf14xfaqkw@git.kernel.org

mm: Fixup all fault handlers to check current->pagefault_disable

2012-02-15T16:32:32+00:00

Necessary for decoupling pagefault disable from preempt count.

Signed-off-by: Thomas Gleixner

ARM: AT91: PIT: Remove irq handler when clock event is unused

2012-02-15T16:32:31+00:00

Setup and remove the interrupt handler in clock event mode selection.
This avoids calling the (shared) interrupt handler when the device is
not used.

Signed-off-by: Benedikt Spranger 
Signed-off-by: Thomas Gleixner

sched: Use schedule_preempt_disabled()

2012-02-15T16:32:30+00:00

Coccinelle based conversion.

Signed-off-by: Thomas Gleixner

preempt-rt: Convert arm boot_lock to raw

2012-02-15T16:32:29+00:00

The arm boot_lock is used by the secondary processor startup code.  The locking
task is the idle thread, which has idle->sched_class == &idle_sched_class.
idle_sched_class->enqueue_task == NULL, so if the idle task blocks on the
lock, the attempt to wake it when the lock becomes available will fail:

try_to_wake_up()
   ...
      activate_task()
         enqueue_task()
            p->sched_class->enqueue_task(rq, p, flags)

Fix by converting boot_lock to a raw spin lock.

Signed-off-by: Frank Rowand 
Link: http://lkml.kernel.org/r/4E77B952.3010606@am.sony.com
Signed-off-by: Thomas Gleixner

arm: Allow forced irq threading

2012-02-15T16:32:29+00:00

All timer interrupts and the perf interrupt are marked NO_THREAD, so
its safe to allow forced interrupt threading.

Signed-off-by: Thomas Gleixner

arm: Mark pmu interupt IRQF_NO_THREAD

2012-02-15T16:32:29+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