diff options
| author | Alan Kao <alankao@andestech.com> | 2018-02-13 13:13:17 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-04-02 19:59:12 -0700 |
| commit | c15ac4fd60d5ffdb151bb2c7805f377fd7f90363 (patch) | |
| tree | 758628a4b5779f5af742da0b1781e8a467736827 /arch/riscv/Kconfig | |
| parent | a1d2a6b4cee858a2f27eebce731fbf1dfd72cb4e (diff) | |
riscv/ftrace: Add dynamic function tracer support
We now have dynamic ftrace with the following added items:
* ftrace_make_call, ftrace_make_nop (in kernel/ftrace.c)
The two functions turn each recorded call site of filtered functions
into a call to ftrace_caller or nops
* ftracce_update_ftrace_func (in kernel/ftrace.c)
turns the nops at ftrace_call into a call to a generic entry for
function tracers.
* ftrace_caller (in kernel/mcount-dyn.S)
The entry where each _mcount call sites calls to once they are
filtered to be traced.
Also, this patch fixes the semantic problems in mcount.S, which will be
treated as only a reference implementation once we have the dynamic
ftrace.
Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: Alan Kao <alankao@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c9ccc6ea4371..1e9d878c1ac4 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -115,6 +115,7 @@ config ARCH_RV64I select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FTRACE_MCOUNT_RECORD + select HAVE_DYNAMIC_FTRACE endchoice |