[v3,0/2] arm64: refactor the rodata=xxx

Message

Huang Shijie Dec. 9, 2024, 7:20 a.m. UTC

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(-)