linux-kernel - [PATCH v3 0/2] arm64: refactor the rodata=xxx

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Message-Id: <20241209072020.4743-1-shijie@os.amperecomputing.com>
Date: Mon,  9 Dec 2024 15:20:18 +0800
From: Huang Shijie <shijie@...amperecomputing.com>
To: catalin.marinas@....com,
	will@...nel.org,
	anshuman.khandual@....com,
	corbet@....net
Cc: patches@...erecomputing.com,
	cl@...ux.com,
	akpm@...ux-foundation.org,
	thuth@...hat.com,
	rostedt@...dmis.org,
	xiongwei.song@...driver.com,
	ardb@...nel.org,
	inux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Huang Shijie <shijie@...amperecomputing.com>
Subject: [PATCH v3 0/2] 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 Anshuman Khandual's suggetions. 
It makes the "rodata=on" as the default, and removes the CONFIG_RODATA_FULL_DEFAULT_ENABLED.

v3:
  Follows Anshuman Khandual's suggetions:
  - Merge patch 1 and patch 3 into one patch.
  - Remove patch 4 
  - update comments and document.

v2:
  Follows Will's suggetions.
  Add a new file fine-tuning-tips.rst for the expert users.
   https://lists.infradead.org/pipermail/linux-arm-kernel/2024-November/981190.html

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


Huang Shijie (2):
  arm64: refactor the rodata=xxx
  arm64: remove CONFIG_RODATA_FULL_DEFAULT_ENABLED

 .../admin-guide/kernel-parameters.txt         |  2 +-
 arch/arm64/Kconfig                            | 14 -----------
 arch/arm64/include/asm/setup.h                | 25 +++++++++++++++++--
 arch/arm64/mm/pageattr.c                      |  2 +-
 4 files changed, 25 insertions(+), 18 deletions(-)

-- 
2.40.1