tracing: fix config options to not show when automatically selected

There are two options that are selected by all tracers, but we want
to have those options available when no tracer is selected. These are

 The event tracer and sched switch tracer.

The are enabled by all tracers, but if a tracer is not selected we want
the options to appear. All tracers including them select TRACING.
Thus what we would like to do is:

  config EVENT_TRACER
	bool "prompt"
	depends on TRACING
	select TRACING

But that gives us a bug in the kbuild system since we just created a
circular dependency. We only want the prompt to show when TRACING is off.

This patch adds GENERIC_TRACER that all tracers will select instead of
TRACING. The two options (sched switch and event tracer) will select
TRACING directly and depend on !GENERIC_TRACER. This solves the cicular
dependency.

[ Impact: hide options that are selected by default ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index a508b9d..6e55cc3 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -56,6 +56,13 @@ config CONTEXT_SWITCH_TRACER
        select MARKERS
        bool
 
+# All tracer options should select GENERIC_TRACER. For those options that are
+# enabled by all tracers (context switch and event tracer) they select TRACING.
+# This allows those options to appear when no other tracer is selected. But the
+# options do not appear when something else selects it. We need the two options
+# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
+# hidding of the automatic options options.
+
 config TRACING
        bool
        select DEBUG_FS
@@ -66,6 +73,10 @@ config TRACING
        select BINARY_PRINTF
        select EVENT_TRACING
 
+config GENERIC_TRACER
+       bool
+       select TRACING
+
 #
 # Minimum requirements an architecture has to meet for us to
 # be able to offer generic tracing facilities:
@@ -95,7 +106,7 @@ config FUNCTION_TRACER
        depends on HAVE_FUNCTION_TRACER
        select FRAME_POINTER
        select KALLSYMS
-       select TRACING
+       select GENERIC_TRACER
        select CONTEXT_SWITCH_TRACER
        help
          Enable the kernel to trace every kernel function. This is done
@@ -126,7 +137,7 @@ config IRQSOFF_TRACER
        depends on TRACE_IRQFLAGS_SUPPORT
        depends on GENERIC_TIME
        select TRACE_IRQFLAGS
-       select TRACING
+       select GENERIC_TRACER
        select TRACER_MAX_TRACE
        help
          This option measures the time spent in irqs-off critical
@@ -147,7 +158,7 @@ config PREEMPT_TRACER
        default n
        depends on GENERIC_TIME
        depends on PREEMPT
-       select TRACING
+       select GENERIC_TRACER
        select TRACER_MAX_TRACE
        help
          This option measures the time spent in preemption off critical
@@ -166,7 +177,7 @@ config PREEMPT_TRACER
 config SYSPROF_TRACER
        bool "Sysprof Tracer"
        depends on X86
-       select TRACING
+       select GENERIC_TRACER
        select CONTEXT_SWITCH_TRACER
        help
          This tracer provides the trace needed by the 'Sysprof' userspace
@@ -174,7 +185,7 @@ config SYSPROF_TRACER
 
 config SCHED_TRACER
        bool "Scheduling Latency Tracer"
-       select TRACING
+       select GENERIC_TRACER
        select CONTEXT_SWITCH_TRACER
        select TRACER_MAX_TRACE
        help
@@ -183,6 +194,7 @@ config SCHED_TRACER
 
 config ENABLE_CONTEXT_SWITCH_TRACER
        bool "Trace process context switches"
+       depends on !GENERIC_TRACER
        select TRACING
        select CONTEXT_SWITCH_TRACER
        help
@@ -191,6 +203,7 @@ config ENABLE_CONTEXT_SWITCH_TRACER
 
 config ENABLE_EVENT_TRACING
        bool "Trace various events in the kernel"
+       depends on !GENERIC_TRACER
        select TRACING
        help
          This tracer hooks to various trace points in the kernel
@@ -204,14 +217,14 @@ config ENABLE_EVENT_TRACING
 config FTRACE_SYSCALLS
        bool "Trace syscalls"
        depends on HAVE_FTRACE_SYSCALLS
-       select TRACING
+       select GENERIC_TRACER
        select KALLSYMS
        help
          Basic tracer to catch the syscall entry and exit events.
 
 config BOOT_TRACER
        bool "Trace boot initcalls"
-       select TRACING
+       select GENERIC_TRACER
        select CONTEXT_SWITCH_TRACER
        help
          This tracer helps developers to optimize boot times: it records
@@ -228,7 +241,7 @@ config BOOT_TRACER
 
 config TRACE_BRANCH_PROFILING
        bool
-       select TRACING
+       select GENERIC_TRACER
 
 choice
        prompt "Branch Profiling"
@@ -308,7 +321,7 @@ config BRANCH_TRACER
 config POWER_TRACER
        bool "Trace power consumption behavior"
        depends on X86
-       select TRACING
+       select GENERIC_TRACER
        help
          This tracer helps developers to analyze and optimize the kernels
          power management decisions, specifically the C-state and P-state
@@ -342,14 +355,14 @@ config STACK_TRACER
 config HW_BRANCH_TRACER
        depends on HAVE_HW_BRANCH_TRACER
        bool "Trace hw branches"
-       select TRACING
+       select GENERIC_TRACER
        help
          This tracer records all branches on the system in a circular
          buffer giving access to the last N branches for each cpu.
 
 config KMEMTRACE
        bool "Trace SLAB allocations"
-       select TRACING
+       select GENERIC_TRACER
        help
          kmemtrace provides tracing for slab allocator functions, such as
          kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
@@ -369,7 +382,7 @@ config KMEMTRACE
 
 config WORKQUEUE_TRACER
        bool "Trace workqueues"
-       select TRACING
+       select GENERIC_TRACER
        help
          The workqueue tracer provides some statistical informations
           about each cpu workqueue thread such as the number of the
@@ -385,7 +398,7 @@ config BLK_DEV_IO_TRACE
        select RELAY
        select DEBUG_FS
        select TRACEPOINTS
-       select TRACING
+       select GENERIC_TRACER
        select STACKTRACE
        help
          Say Y here if you want to be able to trace the block layer actions
@@ -446,7 +459,7 @@ config FTRACE_SELFTEST
 
 config FTRACE_STARTUP_TEST
        bool "Perform a startup test on ftrace"
-       depends on TRACING
+       depends on GENERIC_TRACER
        select FTRACE_SELFTEST
        help
          This option performs a series of startup tests on ftrace. On bootup
@@ -457,7 +470,7 @@ config FTRACE_STARTUP_TEST
 config MMIOTRACE
        bool "Memory mapped IO tracing"
        depends on HAVE_MMIOTRACE_SUPPORT && PCI
-       select TRACING
+       select GENERIC_TRACER
        help
          Mmiotrace traces Memory Mapped I/O access and is meant for
          debugging and reverse engineering. It is called from the ioremap