linux-kernel - [PATCH v4 0/5] Add FIELD

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Message-ID: <20250612-field_modify-v4-0-ae4f74da45a6@quicinc.com>
Date: Thu, 12 Jun 2025 21:46:07 +0800
From: Luo Jie <quic_luoj@...cinc.com>
To: Yury Norov <yury.norov@...il.com>,
        Rasmus Villemoes
	<linux@...musvillemoes.dk>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        "Nicolas
 Palix" <nicolas.palix@...g.fr>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton
	<oliver.upton@...ux.dev>,
        Joey Gouly <joey.gouly@....com>,
        Suzuki K Poulose
	<suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>
CC: <linux-kernel@...r.kernel.org>, <cocci@...ia.fr>,
        <linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
        <andrew@...n.ch>, <quic_kkumarcs@...cinc.com>,
        <quic_linchen@...cinc.com>, <quic_leiwei@...cinc.com>,
        <quic_suruchia@...cinc.com>, <quic_pavir@...cinc.com>,
        Luo Jie <quic_luoj@...cinc.com>
Subject: [PATCH v4 0/5] Add FIELD_MODIFY() helper

Add the helper FIELD_MODIFY() to the FIELD_XXX family of bitfield
macros. It is functionally similar as xxx_replace_bits(), but adds
the compile time checking to catch incorrect parameter type errors.

This series also converts the four instances of opencoded FIELD_MODIFY()
that are found in the core kernel files, to instead use the new
FIELD_MODIFY() macro. This is achieved with Coccinelle, by adding
the script field_modify.cocci.

The changes are validated on IPQ9574 SoC which uses ARM64 architecture.

Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
---
Changes in v4:
- Add org, report and context mode for coccinelle script.
- Fix other comments on coccinelle script patch.
- Remove the FIELD_MODIFY patch as it is merged.
- Link to v3: https://lore.kernel.org/r/20250417-field_modify-v3-0-6f7992aafcb7@quicinc.com

Changes in v3:
- Correct the order of header files included.
- Add the Coccinelle script field_modify.cocci..
- Convert the opencoded FIELD_MODIFY() variants inside arm64 directory,
  identified by field_modify.cocci.
- Link to v2: https://lore.kernel.org/all/20250410131048.2054791-1-quic_luoj@quicinc.com/

Changes in v2:
- Update the documented example for FIELD_MODIFY().
- Improve the commit message to describe the need for the change.
- Link to v1: https://lore.kernel.org/all/20250318071526.1836194-1-quic_luoj@quicinc.com/

---
Luo Jie (5):
      coccinelle: misc: Add field_modify script
      arm64: tlb: Convert the opencoded field modify
      arm64: nvhe: Convert the opencoded field modify
      arm64: kvm: Convert the opencoded field modify
      arm64: mm: Convert the opencoded field modify

 arch/arm64/include/asm/tlbflush.h          |  3 +-
 arch/arm64/kvm/hyp/include/nvhe/memory.h   |  3 +-
 arch/arm64/kvm/vgic/vgic-mmio-v3.c         |  6 +--
 arch/arm64/mm/context.c                    |  3 +-
 scripts/coccinelle/misc/field_modify.cocci | 61 ++++++++++++++++++++++++++++++
 5 files changed, 66 insertions(+), 10 deletions(-)
---
base-commit: 0bb71d301869446810a0b13d3da290bd455d7c78
change-id: 20250612-field_modify-27139f673881

Best regards,
-- 
Luo Jie <quic_luoj@...cinc.com>