Merge branch 'tracing/ftrace' into tracing/urgent

10 files changed, 68 insertions, 25 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 1cb3e1f616a..3533c583df4 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -1,11 +1,12 @@
 #
-# Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
+# Architectures that offer an FUNCTION_TRACER implementation should
+#  select HAVE_FUNCTION_TRACER:
 #
 
 config NOP_TRACER
 	bool
 
-config HAVE_FTRACE
+config HAVE_FUNCTION_TRACER
 	bool
 	select NOP_TRACER
 
@@ -28,9 +29,9 @@ config TRACING
 	select STACKTRACE
 	select TRACEPOINTS
 
-config FTRACE
+config FUNCTION_TRACER
 	bool "Kernel Function Tracer"
-	depends on HAVE_FTRACE
+	depends on HAVE_FUNCTION_TRACER
 	depends on DEBUG_KERNEL
 	select FRAME_POINTER
 	select TRACING
@@ -49,7 +50,6 @@ config IRQSOFF_TRACER
 	default n
 	depends on TRACE_IRQFLAGS_SUPPORT
 	depends on GENERIC_TIME
-	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACE_IRQFLAGS
 	select TRACING
@@ -73,7 +73,6 @@ config PREEMPT_TRACER
 	default n
 	depends on GENERIC_TIME
 	depends on PREEMPT
-	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACING
 	select TRACER_MAX_TRACE
@@ -101,7 +100,6 @@ config SYSPROF_TRACER
 
 config SCHED_TRACER
 	bool "Scheduling Latency Tracer"
-	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACING
 	select CONTEXT_SWITCH_TRACER
@@ -112,7 +110,6 @@ config SCHED_TRACER
 
 config CONTEXT_SWITCH_TRACER
 	bool "Trace process context switches"
-	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACING
 	select MARKERS
@@ -122,7 +119,6 @@ config CONTEXT_SWITCH_TRACER
 
 config BOOT_TRACER
 	bool "Trace boot initcalls"
-	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACING
 	help
@@ -141,9 +137,9 @@ config BOOT_TRACER
 
 config STACK_TRACER
 	bool "Trace max stack"
-	depends on HAVE_FTRACE
+	depends on HAVE_FUNCTION_TRACER
 	depends on DEBUG_KERNEL
-	select FTRACE
+	select FUNCTION_TRACER
 	select STACKTRACE
 	help
 	  This special tracer records the maximum stack footprint of the
@@ -160,7 +156,7 @@ config STACK_TRACER
 
 config DYNAMIC_FTRACE
 	bool "enable/disable ftrace tracepoints dynamically"
-	depends on FTRACE
+	depends on FUNCTION_TRACER
 	depends on HAVE_DYNAMIC_FTRACE
 	depends on DEBUG_KERNEL
 	default y
@@ -170,7 +166,7 @@ config DYNAMIC_FTRACE
 	 with a No-Op instruction) as they are called. A table is
 	 created to dynamically enable them again.
 
-	 This way a CONFIG_FTRACE kernel is slightly larger, but otherwise
+	 This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise
 	 has native performance as long as no tracing is active.
 
 	 The changes to the code are done by a kernel thread that
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index a85dfba88ba..c8228b1a49e 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -1,7 +1,7 @@
 
 # Do not instrument the tracer itself:
 
-ifdef CONFIG_FTRACE
+ifdef CONFIG_FUNCTION_TRACER
 ORIG_CFLAGS := $(KBUILD_CFLAGS)
 KBUILD_CFLAGS = $(subst -pg,,$(ORIG_CFLAGS))
 
@@ -10,13 +10,13 @@ CFLAGS_trace_selftest_dynamic.o = -pg
 obj-y += trace_selftest_dynamic.o
 endif
 
-obj-$(CONFIG_FTRACE) += libftrace.o
+obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
 obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
 
 obj-$(CONFIG_TRACING) += trace.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
 obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
-obj-$(CONFIG_FTRACE) += trace_functions.o
+obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4dda4f60a2a..1f54a94189f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -164,10 +164,14 @@ static DEFINE_SPINLOCK(ftrace_hash_lock);
 #define ftrace_hash_lock(flags)	  spin_lock_irqsave(&ftrace_hash_lock, flags)
 #define ftrace_hash_unlock(flags) \
 			spin_unlock_irqrestore(&ftrace_hash_lock, flags)
+static void ftrace_release_hash(unsigned long start, unsigned long end);
 #else
 /* This is protected via the ftrace_lock with MCOUNT_RECORD. */
 #define ftrace_hash_lock(flags)   do { (void)(flags); } while (0)
 #define ftrace_hash_unlock(flags) do { } while(0)
+static inline void ftrace_release_hash(unsigned long start, unsigned long end)
+{
+}
 #endif
 
 /*
@@ -347,6 +351,7 @@ void ftrace_release(void *start, unsigned long size)
 	}
 	spin_unlock(&ftrace_lock);
 
+	ftrace_release_hash(s, e);
 }
 
 static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
@@ -1659,6 +1664,44 @@ void __init ftrace_init(void)
 	ftrace_disabled = 1;
 }
 #else /* CONFIG_FTRACE_MCOUNT_RECORD */
+
+static void ftrace_release_hash(unsigned long start, unsigned long end)
+{
+	struct dyn_ftrace *rec;
+	struct hlist_node *t, *n;
+	struct hlist_head *head, temp_list;
+	unsigned long flags;
+	int i, cpu;
+
+	preempt_disable_notrace();
+
+	/* disable incase we call something that calls mcount */
+	cpu = raw_smp_processor_id();
+	per_cpu(ftrace_shutdown_disable_cpu, cpu)++;
+
+	ftrace_hash_lock(flags);
+
+	for (i = 0; i < FTRACE_HASHSIZE; i++) {
+		INIT_HLIST_HEAD(&temp_list);
+		head = &ftrace_hash[i];
+
+		/* all CPUS are stopped, we are safe to modify code */
+		hlist_for_each_entry_safe(rec, t, n, head, node) {
+			if (rec->flags & FTRACE_FL_FREE)
+				continue;
+
+			if ((rec->ip >= start) && (rec->ip < end))
+				ftrace_free_rec(rec);
+		}
+	}
+
+	ftrace_hash_unlock(flags);
+
+	per_cpu(ftrace_shutdown_disable_cpu, cpu)--;
+	preempt_enable_notrace();
+
+}
+
 static int ftraced(void *ignore)
 {
 	unsigned long usecs;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d345d649d07..aeb2f2505bc 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -851,7 +851,7 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
 	preempt_enable_notrace();
 }
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 static void
 function_trace_call(unsigned long ip, unsigned long parent_ip)
 {
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f1f99572cde..6889ca48f1f 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -335,7 +335,7 @@ void update_max_tr_single(struct trace_array *tr,
 
 extern cycle_t ftrace_now(int cpu);
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 void tracing_start_function_trace(void);
 void tracing_stop_function_trace(void);
 #else
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index e90eb0c2c56..0f85a64003d 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -64,7 +64,7 @@ static void function_trace_ctrl_update(struct trace_array *tr)
 
 static struct tracer function_trace __read_mostly =
 {
-	.name	     = "ftrace",
+	.name	     = "function",
 	.init	     = function_trace_init,
 	.reset	     = function_trace_reset,
 	.ctrl_update = function_trace_ctrl_update,
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index a7db7f040ae..9c74071c10e 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -63,7 +63,7 @@ irq_trace(void)
  */
 static __cacheline_aligned_in_smp	unsigned long max_sequence;
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 /*
  * irqsoff uses its own tracer function to keep the overhead down:
  */
@@ -104,7 +104,7 @@ static struct ftrace_ops trace_ops __read_mostly =
 {
 	.func = irqsoff_tracer_call,
 };
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 /*
  * Should this new latency be reported/recorded?
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index fe4a252c236..3ae93f16b56 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -31,7 +31,7 @@ static raw_spinlock_t wakeup_lock =
 
 static void __wakeup_reset(struct trace_array *tr);
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 /*
  * irqsoff uses its own tracer function to keep the overhead down:
  */
@@ -96,7 +96,7 @@ static struct ftrace_ops trace_ops __read_mostly =
 {
 	.func = wakeup_tracer_call,
 };
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 /*
  * Should this new latency be reported/recorded?
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 09cf230d7ec..95815d26a04 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -70,7 +70,7 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
 	return ret;
 }
 
-#ifdef CONFIG_FTRACE
+#ifdef CONFIG_FUNCTION_TRACER
 
 #ifdef CONFIG_DYNAMIC_FTRACE
 
@@ -226,7 +226,7 @@ trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
 
 	return ret;
 }
-#endif /* CONFIG_FTRACE */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_IRQSOFF_TRACER
 int
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 74c5d9a3afa..be682b62fe5 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -44,6 +44,10 @@ static inline void check_stack(void)
 	if (this_size <= max_stack_size)
 		return;
 
+	/* we do not handle interrupt stacks yet */
+	if (!object_is_on_stack(&this_size))
+		return;
+
 	raw_local_irq_save(flags);
 	__raw_spin_lock(&max_stack_lock);