Re: [PATCH v4 0/6] Add dynamic ftrace support for RISC-V platforms

[Alan Kao <alankao@andestech.com>]

On Tue, Feb 13, 2018 at 01:13:15PM +0800, Alan Quey-Liang Kao(高魁良) wrote:
> This patch set includes the building blocks of dynamic ftrace features
> for RISC-V machines.
> 
> Changes in v4:
>  - Organize code structure according to changes in v3
>  - Rebase onto the riscv-linux-4.15 branch at github's 
>    riscv/riscv-linux repo.  Note that this set is based on the previous
>    ftrace patch, which provided basic support.
> 
> Changes in v3:
>  - Replace the nops at the tracer call sites into "call ftrace_stub"
>    instructions for better understanding (1/6, 2/6 and 5/6)
> 
> Changes in v2:
>  - Fix the return value as writing to kernel text goes wrong (2/6)
>  - Replace manual comparisons by calling memcmp (2/6)
>  - Simplify the conditional assignment in the Makefile (1/6)
> 
> Alan Kao (6):
>   riscv/ftrace: Add RECORD_MCOUNT support
>   riscv/ftrace: Add dynamic function tracer support
>   riscv/ftrace: Add dynamic function graph tracer support
>   riscv/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS support
>   riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support
>   riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support
> 
>  arch/riscv/Kconfig              |   3 +
>  arch/riscv/Makefile             |   3 +
>  arch/riscv/include/asm/ftrace.h |  56 ++++++++++
>  arch/riscv/kernel/Makefile      |   5 +-
>  arch/riscv/kernel/ftrace.c      | 175 ++++++++++++++++++++++++++++-
>  arch/riscv/kernel/mcount-dyn.S  | 239 ++++++++++++++++++++++++++++++++++++++++
>  arch/riscv/kernel/mcount.S      |  22 ++--
>  arch/riscv/kernel/stacktrace.c  |   6 +
>  scripts/recordmcount.pl         |   5 +
>  9 files changed, 501 insertions(+), 13 deletions(-)
>  create mode 100644 arch/riscv/kernel/mcount-dyn.S
> 
> -- 
> 2.15.1
>

Any comments?