Feather-Trace: add platform independent implementation

This patch adds the simple fallback implementation and creates dummy
hooks in the x86 and ARM Kconfig files.

Feather-Buffer: convert to atomic_t

Feather-Trace: remove custom atomic ops - patch by Namhoon Kim (UNC).

Feather-Trace: switch to correct portable atomics header - thanks Andrea Bastoni

1 files changed, 43 insertions, 0 deletions

diff --git a/litmus/ft_event.c b/litmus/ft_event.c
new file mode 100644
index 000000000000..399a07becca5
--- /dev/null
+++ b/litmus/ft_event.c
@@ -0,0 +1,43 @@
+#include <linux/types.h>
+
+#include <litmus/feather_trace.h>
+
+#if !defined(CONFIG_ARCH_HAS_FEATHER_TRACE) || defined(CONFIG_DEBUG_RODATA)
+/* provide dummy implementation */
+
+int ft_events[MAX_EVENTS];
+
+int ft_enable_event(unsigned long id)
+{
+        if (id < MAX_EVENTS) {
+                ft_events[id]++;
+                return 1;
+        } else
+                return 0;
+}
+
+int ft_disable_event(unsigned long id)
+{
+        if (id < MAX_EVENTS && ft_events[id]) {
+                ft_events[id]--;
+                return 1;
+        } else
+                return 0;
+}
+
+int ft_disable_all_events(void)
+{
+        int i;
+
+        for (i = 0; i < MAX_EVENTS; i++)
+                ft_events[i] = 0;
+
+        return MAX_EVENTS;
+}
+
+int ft_is_event_enabled(unsigned long id)
+{
+        return  id < MAX_EVENTS && ft_events[id];
+}
+
+#endif