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tracing/ftrace: make boot tracer select the sched_switch tracer 

Impact: build fix

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@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-10-22 19:26:23 +02:00 committed by Ingo Molnar
parent f66af459a9
commit ea31e72d75
1 changed files with 1 additions and 0 deletions
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kernel/trace/Kconfig
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@ -123,6 +123,7 @@ config BOOT_TRACER
bool "Trace boot initcalls" bool "Trace boot initcalls"
depends on DEBUG_KERNEL depends on DEBUG_KERNEL
select TRACING select TRACING
select CONTEXT_SWITCH_TRACER
help help
This tracer helps developers to optimize boot times: it records This tracer helps developers to optimize boot times: it records
the timings of the initcalls and traces key events and the identity the timings of the initcalls and traces key events and the identity