Re: [PATCH 0/2] s390/ftrace: implement hotpatching

[Heiko Carstens]

On Wed, Jul 28, 2021 at 11:25:44PM +0200, Ilya Leoshkevich wrote:
> Hello,
> 
> This series implements the stop_machine()-less ftrace code patching
> for s390. It's trickier than that of e.g. Intel, because the only
> on-the-fly code patching allowed by s390 is changing a mask of a
> conditional branch instruction. Patch 1 contains a new common code hook
> that we need for that, patch 2 contains the actual implementation as
> well as explanation of all the small details.
> 
> We would like to take this series through the s390 tree, and we need a
> review on the patch 1 for that. Could you please take a look?
> 
> Best regards,
> Ilya
> 
> Ilya Leoshkevich (2):
>   ftrace: Introduce ftrace_need_init_nop()
>   s390/ftrace: implement hotpatching
> 
>  arch/s390/include/asm/ftrace.h     |  46 +------
>  arch/s390/include/asm/ftrace.lds.h |  21 +++
>  arch/s390/include/asm/module.h     |   8 ++
>  arch/s390/kernel/ftrace.c          | 207 ++++++++++++++++++++++++++---
>  arch/s390/kernel/ftrace.h          |  24 ++++
>  arch/s390/kernel/module.c          |  45 +++++++
>  arch/s390/kernel/vmlinux.lds.S     |   2 +
>  include/linux/ftrace.h             |  16 +++
>  kernel/trace/ftrace.c              |   4 +-
>  9 files changed, 314 insertions(+), 59 deletions(-)
>  create mode 100644 arch/s390/include/asm/ftrace.lds.h
>  create mode 100644 arch/s390/kernel/ftrace.h

Series applied, thank you!