linux-kernel - [PATCH] tracing/ftrace: Make boot tracer select the sched

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Message-ID: <48F111F0.3000704@gmail.com>
Date:	Sat, 11 Oct 2008 22:52:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] tracing/ftrace: Make boot tracer select the sched_switch
 tracer

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@...il.com>
---
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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