diff options
| author | Michal Simek <monstr@monstr.eu> | 2009-11-16 09:40:14 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2009-12-14 08:40:09 +0100 |
| commit | 2fd7c761a24c28e83d7194b4b4a099451126a503 (patch) | |
| tree | c8647ae1bc4519649e35e46b231f3f2af77f9a76 /arch/microblaze/Kconfig | |
| parent | microblaze: Add TRACE_IRQFLAGS_SUPPORT (diff) | |
| download | linux-2fd7c761a24c28e83d7194b4b4a099451126a503.tar.xz linux-2fd7c761a24c28e83d7194b4b4a099451126a503.zip | |
microblaze: ftrace: add static function tracer
If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to
_mcount will be inserted into each kernel function. so, there is a
possibility to trace the kernel functions in _mcount.
This patch add the specific _mcount support for static function
tracing. by default, ftrace_trace_function is initialized as
ftrace_stub(an empty function), so, the default _mcount will introduce
very little overhead. after enabling ftrace in user-space, it will jump
to a real tracing function and do static function tracing for us.
Commit message from Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/Kconfig')
| -rw-r--r-- | arch/microblaze/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 57eeaa60ca69..18003ca08196 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -6,6 +6,7 @@ mainmenu "Linux/Microblaze Kernel Configuration" config MICROBLAZE def_bool y select HAVE_LMB + select HAVE_FUNCTION_TRACER select USB_ARCH_HAS_EHCI select ARCH_WANT_OPTIONAL_GPIOLIB |