Commit 69132c2d authored Jan 15, 2026 by Guodong Xu Committed by Paul Walmsley Jan 14, 2026

Documentation: riscv: uabi: Clarify ISA spec version for canonical order



Specify that chapter 27 refers to version 20191213 of the RISC-V ISA
Unprivileged Architecture. The chapter numbering differs across
specification versions - for example, in version 20250508, the ISA
Extension Naming Conventions is chapter 36, not chapter 27.

Historical versions of the RISC-V specification can be found via Link [1].

Acked-by: Paul Walmsley <pjw@kernel.org>
Link: https://riscv.org/specifications/ratified/

 [1]
Fixes: f07b2b3f ("Documentation: riscv: add a section about ISA string ordering in /proc/cpuinfo")
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Link: https://patch.msgid.link/20260115-adding-b-dtsi-v2-1-254dd61cf947@riscstar.com

parent 0f61b186

Documentation/arch/riscv/uabi.rst

+3 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,9 @@ ISA string ordering in /proc/cpuinfo
		------------------------------------

		The canonical order of ISA extension names in the ISA string is defined in
		chapter 27 of the unprivileged specification.
		Chapter 27 of the RISC-V Instruction Set Manual Volume I Unprivileged ISA
		(Document Version 20191213).

		The specification uses vague wording, such as should, when it comes to ordering,
		so for our purposes the following rules apply: