linux-kernel - [PATCH v2 0/2] Support fixmap and jump

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Message-ID: <20250806020520.570988-1-chenmiao.ku@gmail.com>
Date: Wed,  6 Aug 2025 02:05:02 +0000
From: ChenMiao <chenmiao.ku@...il.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: Linux OpenRISC <linux-openrisc@...r.kernel.org>,
	chenmiao <chenmiao.ku@...il.com>
Subject: [PATCH v2 0/2] Support fixmap and jump_label for openrisc

From: chenmiao <chenmiao.ku@...il.com>

Hello everyone,

This implements a basic text patching mechanism and a complete jump_label 
implementation for OpenRISC.

1. Implement the patch_map interface and the patch_insn_write single insn 
write API by providing FIX_TEXT_POKE0. And create a new insn-def.h to record 
openrisc's instruction macro definition which only have OPENRISC_INSN_SIZE 
now.

- V2: modify the patch_insn_write API from const void* to u32 insn.

2. Based on the previously implemented patch_insn_write, achieve a complete 
jump_label implementation, directly supporting arch_jump_label_transform_queue.
And add a new macro OPENRISC_INSN_NOP in insn-def.h.

- V2: using the modified patch_insn_write API in 
arch_jump_label_transform_queue.

Link: https://lore.kernel.org/openrisc/20250805084926.4125564-1-chenmiao.ku@gmail.com/T/#u

Thanks,

Chen Miao

chenmiao (2):
  openrisc: Add text patching API support
  openrisc: Add jump label support

 .../core/jump-labels/arch-support.txt         |  2 +-
 arch/openrisc/Kconfig                         |  2 +
 arch/openrisc/configs/or1ksim_defconfig       | 19 ++---
 arch/openrisc/configs/virt_defconfig          |  1 +
 arch/openrisc/include/asm/Kbuild              |  1 -
 arch/openrisc/include/asm/fixmap.h            |  1 +
 arch/openrisc/include/asm/insn-def.h          | 15 ++++
 arch/openrisc/include/asm/jump_label.h        | 68 ++++++++++++++++
 arch/openrisc/include/asm/text-patching.h     | 13 +++
 arch/openrisc/kernel/Makefile                 |  2 +
 arch/openrisc/kernel/jump_label.c             | 53 +++++++++++++
 arch/openrisc/kernel/patching.c               | 79 +++++++++++++++++++
 arch/openrisc/kernel/setup.c                  |  2 +
 arch/openrisc/mm/init.c                       |  2 +-
 14 files changed, 245 insertions(+), 15 deletions(-)
 create mode 100644 arch/openrisc/include/asm/insn-def.h
 create mode 100644 arch/openrisc/include/asm/jump_label.h
 create mode 100644 arch/openrisc/include/asm/text-patching.h
 create mode 100644 arch/openrisc/kernel/jump_label.c
 create mode 100644 arch/openrisc/kernel/patching.c

-- 
2.45.2