[ported from 2008.3] Add tracing support and hook up Litmus KConfig for x86

- fix requesting more than 2^11 pages (MAX_ORDER)
  to system allocator

Still to be merged:
- feather-trace generic implementation

2 files changed, 16 insertions, 1 deletions

diff --git a/include/litmus/feather_trace.h b/include/litmus/feather_trace.h
index 3ac1ee5e0277..eef8af7a414e 100644
--- a/include/litmus/feather_trace.h
+++ b/include/litmus/feather_trace.h
@@ -1,6 +1,7 @@
 #ifndef _FEATHER_TRACE_H_
 #define _FEATHER_TRACE_H_
 
+#include <asm/feather_trace.h>
 
 int ft_enable_event(unsigned long id);
 int ft_disable_event(unsigned long id);
@@ -30,6 +31,19 @@ extern int ft_events[MAX_EVENTS];
 
 #define ft_event3(id, callback, p, p2, p3) \
         if (ft_events[id]) callback(id, p, p2, p3);
+
+#include <asm/atomic.h>
+
+static inline int fetch_and_inc(int *val)
+{
+        return atomic_add_return(1, (atomic_t*) val) - 1;
+}
+
+static inline int fetch_and_dec(int *val)
+{
+        return atomic_sub_return(1, (atomic_t*) val) + 1;
+}
+
 #endif
 
 
diff --git a/include/litmus/sched_trace.h b/include/litmus/sched_trace.h
index afd0391d127b..aae6ac27fe1b 100644
--- a/include/litmus/sched_trace.h
+++ b/include/litmus/sched_trace.h
@@ -1,4 +1,5 @@
-/* sched_trace.h -- record scheduler events to a byte stream for offline analysis.
+/*
+ * sched_trace.h -- record scheduler events to a byte stream for offline analysis.
  */
 #ifndef _LINUX_SCHED_TRACE_H_
 #define _LINUX_SCHED_TRACE_H_