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| author | Michal Simek <monstr@monstr.eu> | 2009-11-16 11:40:14 +0300 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2009-12-14 10:40:09 +0300 |
| commit | 2fd7c761a24c28e83d7194b4b4a099451126a503 (patch) | |
| tree | c8647ae1bc4519649e35e46b231f3f2af77f9a76 /arch/microblaze/kernel/Makefile | |
| parent | a3cd613b2e775eb59816c2c7c49c038d54917208 (diff) | |
| download | linux-2fd7c761a24c28e83d7194b4b4a099451126a503.tar.xz | |
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/kernel/Makefile')
| -rw-r--r-- | arch/microblaze/kernel/Makefile | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile index c465a5c4669c..d5ee3264cd7d 100644 --- a/arch/microblaze/kernel/Makefile +++ b/arch/microblaze/kernel/Makefile @@ -2,6 +2,16 @@ # Makefile # +ifdef CONFIG_FUNCTION_TRACER +# Do not trace early boot code and low level code +CFLAGS_REMOVE_timer.o = -pg +CFLAGS_REMOVE_intc.o = -pg +CFLAGS_REMOVE_early_printk.o = -pg +CFLAGS_REMOVE_selfmod.o = -pg +CFLAGS_REMOVE_heartbeat.o = -pg +CFLAGS_REMOVE_ftrace.o = -pg +endif + extra-y := head.o vmlinux.lds obj-y += exceptions.o \ @@ -17,5 +27,6 @@ obj-$(CONFIG_HEART_BEAT) += heartbeat.o obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o obj-$(CONFIG_MMU) += misc.o obj-$(CONFIG_STACKTRACE) += stacktrace.o +obj-$(CONFIG_FUNCTION_TRACER) += mcount.o obj-y += entry$(MMU).o |