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SubjectRe: [PATCH 0/2] s390/ftrace: implement hotpatching
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!

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