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

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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: f07b2b3f9d ("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
This commit is contained in:
Guodong Xu
2026-01-15 07:18:57 +08:00
committed by Paul Walmsley
parent 0f61b1860c
commit 69132c2d4c
1 changed files with 3 additions and 1 deletions
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4
Documentation/arch/riscv/uabi.rst
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@@ -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: