linux-kernel - [PATCH 0/2] s390/ftrace: implement hotpatching

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Date:   Wed, 28 Jul 2021 23:25:44 +0200
From:   Ilya Leoshkevich <iii@...ux.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH 0/2] s390/ftrace: implement hotpatching

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

-- 
2.31.1