Add TRACE() debug tracing support

This patch adds the infrastructure for the TRACE() debug macro.

Conflicts:
	kernel/printk.c

1 files changed, 40 insertions, 0 deletions

diff --git a/include/litmus/debug_trace.h b/include/litmus/debug_trace.h
new file mode 100644
index 000000000000..1266ac6a760c
--- /dev/null
+++ b/include/litmus/debug_trace.h
@@ -0,0 +1,40 @@
+#ifndef LITMUS_DEBUG_TRACE_H
+#define LITMUS_DEBUG_TRACE_H
+
+#ifdef CONFIG_SCHED_DEBUG_TRACE
+void sched_trace_log_message(const char* fmt, ...);
+void dump_trace_buffer(int max);
+#else
+
+#define sched_trace_log_message(fmt, ...)
+
+#endif
+
+extern atomic_t __log_seq_no;
+
+#ifdef CONFIG_SCHED_DEBUG_TRACE_CALLER
+#define TRACE_PREFIX "%d P%d [%s@%s:%d]: "
+#define TRACE_ARGS  atomic_add_return(1, &__log_seq_no),        \
+                raw_smp_processor_id(),                         \
+                __FUNCTION__, __FILE__, __LINE__
+#else
+#define TRACE_PREFIX "%d P%d: "
+#define TRACE_ARGS  atomic_add_return(1, &__log_seq_no), \
+                raw_smp_processor_id()
+#endif
+
+#define TRACE(fmt, args...)                                             \
+        sched_trace_log_message(TRACE_PREFIX fmt,                       \
+                                TRACE_ARGS,  ## args)
+
+#define TRACE_TASK(t, fmt, args...)                     \
+        TRACE("(%s/%d:%d) " fmt,                         \
+              t ? (t)->comm : "null",                    \
+              t ? (t)->pid : 0,                          \
+              t ? (t)->rt_param.job_params.job_no : 0,   \
+              ##args)
+
+#define TRACE_CUR(fmt, args...) \
+        TRACE_TASK(current, fmt, ## args)
+
+#endif