[PATCH][RESEND] tracing/ftrace: Make boot tracer select the sched_switchtracer

[Frederic Weisbecker]

If the boot tracer is selected but not the sched_switch,
there will be a build failure:

kernel/built-in.o: In function `boot_trace_init':
trace_boot.c:(.text+0x5ee38): undefined reference to `sched_switch_trace'
kernel/built-in.o: In function `disable_boot_trace':
(.text+0x5eee1): undefined reference to `tracing_stop_cmdline_record'
kernel/built-in.o: In function `enable_boot_trace':
(.text+0x5ef11): undefined reference to `tracing_start_cmdline_record'

This patch fixes it.

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 396aea1..d09c693 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -125,6 +125,7 @@ config BOOT_TRACER
 	depends on HAVE_FTRACE
 	depends on DEBUG_KERNEL
 	select TRACING
+	select CONTEXT_SWITCH_TRACER
 	help
 	 This tracer helps developers to optimize boot times: it records
 	 the timings of the initcalls. Its aim is to be parsed by the
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