Each fdso in a resource group now points to a single litmus_lock object
which will arbitrate access to each of the fdsos.

The SEND_RESCHED is really only interesting if the IPI was generated
by LITMUS^RT. Therefore, we don't need to trace in Linux's
architecture-specific code. Instead, we hook into the preemption state
machine, which is informed about incoming IPIs anyway.

IPIs have some special cases where irq_enter() is not called. This
caused ft_irq_fired() to "miss" some rescheduling-related interrupts,
which in turn may cause outliers.

This patch makes sure ft_irq_fired() is called on scheduling-related
IPIs.

This patch imports recent upstream changes in Feather-Trace that reduce
register pressure around Feather-Trace triggers.

References: Commits 00713b8 and 225d734 in Feather-Trace.

    https://github.com/brandenburg/feather-trace/commit/00713b878636867ce07291c588509b38fa5bf152
    https://github.com/brandenburg/feather-trace/commit/225d7348a08682cd87f72b127142bdfd6c0c7890

From 2.6.39 the "0xee" vector number that we used for pull_timers
low-level management is is use by invalidate_tlb_X interrupts.
Move the pull_timers vector below the max size of invalidate_tlb.

* Update prototypes for switched_to(), prio_changed(), select_task_rq().
* Fix missing pid field in printk output.
* Synchronize syscall numbers for arm and x86.

Some notes:
* Litmus^RT scheduling class is the topmost scheduling class
  (above stop_sched_class).
* scheduler_ipi() function (e.g., in smp_reschedule_interrupt())
  may increase IPI latencies.
* Added path into schedule() to quickly re-evaluate scheduling
  decision without becoming preemptive again. This used to be
  a standard path before the removal of BKL.

Conflicts:
	Makefile
	arch/arm/kernel/calls.S
	arch/arm/kernel/smp.c
	arch/x86/include/asm/unistd_32.h
	arch/x86/kernel/smp.c
	arch/x86/kernel/syscall_table_32.S
	include/linux/hrtimer.h
	kernel/printk.c
	kernel/sched.c
	kernel/sched_fair.c

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  sparc,kgdbts: fix compile regression with kgdb test suite

Commit 63ab25ebbc (kgdbts: unify/generalize gdb breakpoint adjustment)
introduced a compile regression on sparc.

kgdbts.c: In function 'check_and_rewind_pc':
kgdbts.c:307: error: implicit declaration of function 'instruction_pointer_set'

Simply add the correct macro definition for instruction pointer on the
Sparc architecture.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: David S. Miller <davem@davemloft.net>