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Date:   Wed, 07 Feb 2018 16:37:10 -0800 (PST)
Subject:     Re: [patches] [PATCH v3 0/6] Add dynamic ftrace support for RISC-V platforms
In-Reply-To: <20180118154545.17987-1-alankao@andestech.com>
CC:     albert@sifive.com, rostedt@goodmis.org, mingo@redhat.com,
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From:   Palmer Dabbelt <palmer@sifive.com>
To:     nonerkao@gmail.com
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On Thu, 18 Jan 2018 07:45:39 PST (-0800), nonerkao@gmail.com wrote:
> This patch set includes the building blocks of dynamic ftrace features
> for RISC-V machines.
>
> Changes in v3:
>  - Replace the nops at the tracer call sites into a "call ftrace_stub"
>    instruction for better understanding (1/6 and 2/6)
>
> 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 |  47 ++++++++
>  arch/riscv/kernel/Makefile      |   5 +-
>  arch/riscv/kernel/ftrace.c      | 142 ++++++++++++++++++++++-
>  arch/riscv/kernel/mcount-dyn.S  | 241 ++++++++++++++++++++++++++++++++++++++++
>  arch/riscv/kernel/mcount.S      |  22 ++--
>  arch/riscv/kernel/stacktrace.c  |   6 +
>  scripts/recordmcount.pl         |   5 +
>  9 files changed, 461 insertions(+), 13 deletions(-)
>  create mode 100644 arch/riscv/kernel/mcount-dyn.S

Sorry it took me a while to get around to these.  Do you mind submitting a v4 
that's based on linux-4.15?  I'm getting all sorts of merge errors trying to 
"git am" these.