Merge 'Linux v3.0' into Litmus

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

1 files changed, 32 insertions, 24 deletions

diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index 0e4cfb694fe7..1c09820df585 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -5,7 +5,9 @@
 #define _TRACE_IRQ_H
 
 #include <linux/tracepoint.h>
-#include <linux/interrupt.h>
+
+struct irqaction;
+struct softirq_action;
 
 #define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
 #define show_softirq_name(val)                          \
@@ -84,56 +86,62 @@ TRACE_EVENT(irq_handler_exit,
 
 DECLARE_EVENT_CLASS(softirq,
 
-        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+        TP_PROTO(unsigned int vec_nr),
 
-        TP_ARGS(h, vec),
+        TP_ARGS(vec_nr),
 
         TP_STRUCT__entry(
-                __field(        int,    vec                     )
+                __field(        unsigned int,   vec     )
         ),
 
         TP_fast_assign(
-                __entry->vec = (int)(h - vec);
+                __entry->vec = vec_nr;
         ),
 
-        TP_printk("vec=%d [action=%s]", __entry->vec,
+        TP_printk("vec=%u [action=%s]", __entry->vec,
                   show_softirq_name(__entry->vec))
 );
 
 /**
  * softirq_entry - called immediately before the softirq handler
- * @h: pointer to struct softirq_action
- * @vec: pointer to first struct softirq_action in softirq_vec array
+ * @vec_nr:  softirq vector number
  *
- * The @h parameter, contains a pointer to the struct softirq_action
- * which has a pointer to the action handler that is called. By subtracting
- * the @vec pointer from the @h pointer, we can determine the softirq
- * number. Also, when used in combination with the softirq_exit tracepoint
- * we can determine the softirq latency.
+ * When used in combination with the softirq_exit tracepoint
+ * we can determine the softirq handler runtine.
  */
 DEFINE_EVENT(softirq, softirq_entry,
 
-        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+        TP_PROTO(unsigned int vec_nr),
 
-        TP_ARGS(h, vec)
+        TP_ARGS(vec_nr)
 );
 
 /**
  * softirq_exit - called immediately after the softirq handler returns
- * @h: pointer to struct softirq_action
- * @vec: pointer to first struct softirq_action in softirq_vec array
+ * @vec_nr:  softirq vector number
  *
- * The @h parameter contains a pointer to the struct softirq_action
- * that has handled the softirq. By subtracting the @vec pointer from
- * the @h pointer, we can determine the softirq number. Also, when used in
- * combination with the softirq_entry tracepoint we can determine the softirq
- * latency.
+ * When used in combination with the softirq_entry tracepoint
+ * we can determine the softirq handler runtine.
  */
 DEFINE_EVENT(softirq, softirq_exit,
 
-        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+        TP_PROTO(unsigned int vec_nr),
+
+        TP_ARGS(vec_nr)
+);
+
+/**
+ * softirq_raise - called immediately when a softirq is raised
+ * @vec_nr:  softirq vector number
+ *
+ * When used in combination with the softirq_entry tracepoint
+ * we can determine the softirq raise to run latency.
+ */
+DEFINE_EVENT(softirq, softirq_raise,
+
+        TP_PROTO(unsigned int vec_nr),
 
-        TP_ARGS(h, vec)
+        TP_ARGS(vec_nr)
 );
 
 #endif /*  _TRACE_IRQ_H */