trace: rename unlikely profiler to branch profiler

Impact: name change of unlikely tracer and profiler

Ingo Molnar suggested changing the config from UNLIKELY_PROFILE
to BRANCH_PROFILING. I never did like the "unlikely" name so I
went one step farther, and renamed all the unlikely configurations
to a "BRANCH" variant.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/vsyscall_64.c

@@ -18,7 +18,7 @@
  */
 
 /* Disable profiling for userspace code: */
-#define DISABLE_UNLIKELY_PROFILE
+#define DISABLE_BRANCH_PROFILING
 
 #include <linux/time.h>
 #include <linux/init.h>

arch/x86/vdso/vclock_gettime.c

@@ -10,7 +10,7 @@
  */
 
 /* Disable profiling for userspace code: */
-#define DISABLE_UNLIKELY_PROFILE
+#define DISABLE_BRANCH_PROFILING
 
 #include <linux/kernel.h>
 #include <linux/posix-timers.h>

include/asm-generic/vmlinux.lds.h

@@ -45,7 +45,7 @@
 #define MCOUNT_REC()
 #endif
 
-#ifdef CONFIG_TRACE_UNLIKELY_PROFILE
+#ifdef CONFIG_TRACE_BRANCH_PROFILING
 #define LIKELY_PROFILE()	VMLINUX_SYMBOL(__start_likely_profile) = .;   \
 				*(_ftrace_likely)			      \
 				VMLINUX_SYMBOL(__stop_likely_profile) = .;    \

include/linux/compiler.h

@@ -59,26 +59,27 @@ extern void __chk_io_ptr(const volatile void __iomem *);
  * specific implementations come from the above header files
  */
 
-/*
- * Note: DISABLE_UNLIKELY_PROFILE can be used by special lowlevel code
- * to disable branch tracing on a per file basis.
- */
-#if defined(CONFIG_TRACE_UNLIKELY_PROFILE) && !defined(DISABLE_UNLIKELY_PROFILE)
-struct ftrace_likely_data {
+struct ftrace_branch_data {
 	const char *func;
 	const char *file;
 	unsigned line;
 	unsigned long correct;
 	unsigned long incorrect;
 };
-void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect);
+
+/*
+ * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
+ * to disable branch tracing on a per file basis.
+ */
+#if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING)
+void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 
 #define likely_notrace(x)	__builtin_expect(!!(x), 1)
 #define unlikely_notrace(x)	__builtin_expect(!!(x), 0)
 
 #define likely_check(x) ({						\
 			int ______r;					\
-			static struct ftrace_likely_data		\
+			static struct ftrace_branch_data		\
 				__attribute__((__aligned__(4)))		\
 				__attribute__((section("_ftrace_likely"))) \
 				______f = {				\
@@ -93,7 +94,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect);
 		})
 #define unlikely_check(x) ({						\
 			int ______r;					\
-			static struct ftrace_likely_data		\
+			static struct ftrace_branch_data		\
 				__attribute__((__aligned__(4)))		\
 				__attribute__((section("_ftrace_unlikely"))) \
 				______f = {				\

kernel/trace/Kconfig

@@ -159,7 +159,7 @@ config BOOT_TRACER
 	    selected, because the self-tests are an initcall as well and that
 	    would invalidate the boot trace. )
 
-config TRACE_UNLIKELY_PROFILE
+config TRACE_BRANCH_PROFILING
 	bool "Trace likely/unlikely profiler"
 	depends on DEBUG_KERNEL
 	select TRACING
@@ -175,7 +175,7 @@ config TRACE_UNLIKELY_PROFILE
 
 	  Say N if unsure.
 
-config TRACING_UNLIKELY
+config TRACING_BRANCHES
 	bool
 	help
 	  Selected by tracers that will trace the likely and unlikely
@@ -183,10 +183,10 @@ config TRACING_UNLIKELY
 	  profiled. Profiling the tracing infrastructure can only happen
 	  when the likelys and unlikelys are not being traced.
 
-config UNLIKELY_TRACER
+config BRANCH_TRACER
 	bool "Trace likely/unlikely instances"
-	depends on TRACE_UNLIKELY_PROFILE
-	select TRACING_UNLIKELY
+	depends on TRACE_BRANCH_PROFILING
+	select TRACING_BRANCHES
 	help
 	  This traces the events of likely and unlikely condition
 	  calls in the kernel.  The difference between this and the

kernel/trace/Makefile

@@ -11,9 +11,8 @@ obj-y += trace_selftest_dynamic.o
 endif
 
 # If unlikely tracing is enabled, do not trace these files
-ifdef CONFIG_TRACING_UNLIKELY
-KBUILD_CFLAGS += '-Dlikely(x)=likely_notrace(x)'
-KBUILD_CFLAGS += '-Dunlikely(x)=unlikely_notrace(x)'
+ifdef CONFIG_TRACING_BRANCHES
+KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 endif
 
 obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
@@ -31,6 +30,6 @@ obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
 obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_RET_TRACER) += trace_functions_return.o
-obj-$(CONFIG_TRACE_UNLIKELY_PROFILE) += trace_unlikely.o
+obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_unlikely.o
 
 libftrace-y := ftrace.o

kernel/trace/trace.c

@@ -258,7 +258,7 @@ static const char *trace_options[] = {
 	"sched-tree",
 	"ftrace_printk",
 	"ftrace_preempt",
-#ifdef CONFIG_UNLIKELY_TRACER
+#ifdef CONFIG_BRANCH_TRACER
 	"unlikely",
 #endif
 	NULL

kernel/trace/trace.h

@@ -468,7 +468,7 @@ enum trace_iterator_flags {
 	TRACE_ITER_SCHED_TREE		= 0x200,
 	TRACE_ITER_PRINTK		= 0x400,
 	TRACE_ITER_PREEMPTONLY		= 0x800,
-#ifdef CONFIG_UNLIKELY_TRACER
+#ifdef CONFIG_BRANCH_TRACER
 	TRACE_ITER_UNLIKELY		= 0x1000,
 #endif
 };
@@ -530,7 +530,7 @@ static inline void ftrace_preempt_enable(int resched)
 		preempt_enable_notrace();
 }
 
-#ifdef CONFIG_UNLIKELY_TRACER
+#ifdef CONFIG_BRANCH_TRACER
 extern int enable_unlikely_tracing(struct trace_array *tr);
 extern void disable_unlikely_tracing(void);
 static inline int trace_unlikely_enable(struct trace_array *tr)
@@ -552,6 +552,6 @@ static inline int trace_unlikely_enable(struct trace_array *tr)
 static inline void trace_unlikely_disable(void)
 {
 }
-#endif /* CONFIG_UNLIKELY_TRACER */
+#endif /* CONFIG_BRANCH_TRACER */
 
 #endif /* _LINUX_KERNEL_TRACE_H */

kernel/trace/trace_unlikely.c

@@ -15,7 +15,7 @@
 #include <asm/local.h>
 #include "trace.h"
 
-#ifdef CONFIG_UNLIKELY_TRACER
+#ifdef CONFIG_BRANCH_TRACER
 
 static int unlikely_tracing_enabled __read_mostly;
 static DEFINE_MUTEX(unlikely_tracing_mutex);
@@ -119,7 +119,7 @@ static inline
 void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect)
 {
 }
-#endif /* CONFIG_UNLIKELY_TRACER */
+#endif /* CONFIG_BRANCH_TRACER */
 
 void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect)
 {