linux-kernel - [PATCH v2 0/4] arm64: refactor the rodata=xxx

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Message-Id: <20241126085647.4993-1-shijie@os.amperecomputing.com>
Date: Tue, 26 Nov 2024 16:56:43 +0800
From: Huang Shijie <shijie@...amperecomputing.com>
To: catalin.marinas@....com,
	will@...nel.org
Cc: patches@...erecomputing.com,
	paulmck@...nel.org,
	akpm@...ux-foundation.org,
	thuth@...hat.com,
	rostedt@...dmis.org,
	xiongwei.song@...driver.com,
	ardb@...nel.org,
	steven.price@....com,
	suzuki.poulose@....com,
	mark.rutland@....com,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	cl@...amperecomputing.com,
	Huang Shijie <shijie@...amperecomputing.com>
Subject: [PATCH v2 0/4] arm64: refactor the rodata=xxx

>From Documentation/admin-guide/kernel-parameters.txt, we know that:
 rodata=	[KNL,EARLY]
	on	Mark read-only kernel memory as read-only (default).
	off	Leave read-only kernel memory writable for debugging.
	full	Mark read-only kernel memory and aliases as read-only
		[arm64]

So the "rodata=on" is the default.

But the current code does not follow the document, it makes "rodata=full"
as the default.

This patch set follows Will's suggetions:
  - Make our "on" behaviour be what is currently done by "full"
  - Remove RODATA_FULL_DEFAULT_ENABLED
  - Introduce a new option (e.g. "rodata=noalias") which would match the
    current "on" behaviour
  - Update (simplify) the documentation

  https://lists.infradead.org/pipermail/linux-arm-kernel/2024-October/972613.html

v2:
  Follows Will's suggetions.
  Add a new file fine-tuning-tips.rst for the expert users.

v1:
   https://lists.infradead.org/pipermail/linux-arm-kernel/2024-October/971415.html

Huang Shijie (4):
  arm64: make rodata=on behaviour be the original rodata=full
  arm64: remove CONFIG_RODATA_FULL_DEFAULT_ENABLED
  arm64: introduce rodata=noalias
  arm64: add a new document for the fine-tuning tips

 .../admin-guide/kernel-parameters.txt         |  2 +-
 Documentation/arch/arm64/fine-tuning-tips.rst | 23 +++++++++++++++++++
 Documentation/arch/arm64/index.rst            |  1 +
 arch/arm64/Kconfig                            | 14 -----------
 arch/arm64/include/asm/setup.h                |  4 ++--
 arch/arm64/mm/pageattr.c                      |  2 +-
 6 files changed, 28 insertions(+), 18 deletions(-)
 create mode 100644 Documentation/arch/arm64/fine-tuning-tips.rst

-- 
2.40.1