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

[Alan Kao <alankao@andestech.com>]

On Thu, Feb 22, 2018 at 12:05:11AM +0800, Palmer Dabbelt wrote:
> On Mon, 12 Feb 2018 21:13:15 PST (-0800), alankao@andestech.com 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
> 
> Thanks!  I've added this to our for-next tree, it should be good to go for 
> 4.17.  Sorry this took a while, I'm still a bit behind from FOSDEM.

Thanks!

Alan