[PATCH] trace: Stop compiling in trace_clock unconditionally

[Josh Triplett]

Commit 56449f437add737a1e5e1cb7e00f63ac8ead1938, in April 2009, made
trace_clock available unconditionally, since CONFIG_X86_DS used it too.
Commit faa4602e47690fb11221e00f9b9697c8dc0d4b19, in March 2010, removed
CONFIG_X86_DS, and now only CONFIG_RING_BUFFER (split out from
CONFIG_TRACING for general use) has a dependency on trace_clock.  So,
only compile in trace_clock with CONFIG_RING_BUFFER or CONFIG_TRACING
enabled.

Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
 kernel/Makefile       |    2 +-
 kernel/trace/Kconfig  |    5 +++++
 kernel/trace/Makefile |    6 +-----
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/Makefile b/kernel/Makefile
index c0cc67a..29d993b 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -98,7 +98,7 @@ obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
 obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
-obj-$(CONFIG_X86_DS) += trace/
+obj-$(CONFIG_TRACE_CLOCK) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_TRACEPOINTS) += trace/
 obj-$(CONFIG_IRQ_WORK) += irq_work.o
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8c4c070..e8b7c26 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -57,8 +57,12 @@ config HAVE_C_RECORDMCOUNT
 config TRACER_MAX_TRACE
 	bool
 
+config TRACE_CLOCK
+	bool
+
 config RING_BUFFER
 	bool
+	select TRACE_CLOCK
 
 config FTRACE_NMI_ENTER
        bool
@@ -109,6 +113,7 @@ config TRACING
 	select NOP_TRACER
 	select BINARY_PRINTF
 	select EVENT_TRACING
+	select TRACE_CLOCK
 
 config GENERIC_TRACER
 	bool
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index b831087..1b8e4c7 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -17,11 +17,7 @@ endif
 
 CFLAGS_trace_events_filter.o := -I$(src)
 
-#
-# Make the trace clocks available generally: it's infrastructure
-# relied on by ptrace for example:
-#
-obj-y += trace_clock.o
+obj-$(CONFIG_TRACE_CLOCK) += trace_clock.o
 
 obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
 obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
-- 
1.7.10.4

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