[PATCH] ftrace: Allow to explicitly disable the build of the dynamic ftrace with regs

[Petr Mladek]

This patch allows to explicitly disable
CONFIG_DYNAMIC_FTRACE_WITH_REGS. We will need to do so on
PPC with a broken gcc. This situation will be detected at
buildtime and could not be handled by Kbuild automatically.

Also it fixes the prompt of DYNAMIC_FTRACE. The uppercase
better fits the style of the other menu entries.

This patch does not change the default value.

Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Acked-by: Torsten Duwe <duwe@xxxxxx>
---
 kernel/trace/Kconfig | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index a138f6d866ae..de6dab0f74f2 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -449,7 +449,7 @@ config PROBE_EVENTS
 	def_bool n
 
 config DYNAMIC_FTRACE
-	bool "enable/disable function tracing dynamically"
+	bool "Enable/Disable function tracing dynamically"
 	depends on FUNCTION_TRACER
 	depends on HAVE_DYNAMIC_FTRACE
 	default y
@@ -472,9 +472,17 @@ config DYNAMIC_FTRACE
 	  otherwise has native performance as long as no tracing is active.
 
 config DYNAMIC_FTRACE_WITH_REGS
-	def_bool y
+	bool "Pass registers to function tracer"
 	depends on DYNAMIC_FTRACE
 	depends on HAVE_DYNAMIC_FTRACE_WITH_REGS
+	default y
+	help
+	  This option enables passing the current state of processor
+	  registers to the function tracer. It allows to do a more
+	  detailed analyze and print more information.
+
+	  Say Y here if you are unsure. The only exception is if
+	  you want to pass a build error caused by a broken compiler.
 
 config FUNCTION_PROFILER
 	bool "Kernel function profiler"
-- 
1.8.5.6