linux-kernel - [PATCH v2 3/3] riscv: cpufeature: Clarify ISA spec version for canonical order

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Message-Id: <20260125-supm-ext-id-v2-3-1e3b9714c860@riscstar.com>
Date: Sun, 25 Jan 2026 09:36:08 +0800
From: Guodong Xu <guodong@...cstar.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Samuel Holland <samuel.holland@...ive.com>, 
 Heinrich Schuchardt <heinrich.schuchardt@...onical.com>, 
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
 Evan Green <evan@...osinc.com>, Andrew Jones <ajones@...tanamicro.com>, 
 Conor Dooley <conor.dooley@...rochip.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, 
 Conor Dooley <conor@...nel.org>, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Guodong Xu <guodong@...cstar.com>
Subject: [PATCH v2 3/3] riscv: cpufeature: 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: Conor Dooley <conor.dooley@...rochip.com>
Link: https://riscv.org/specifications/ratified/ [1]
Fixes: 99e2266f2460 ("RISC-V: clarify ISA string ordering rules in cpu.c")
Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
v2: Add Acked-by from Conor.
    Update the Fixes tag to point to the original commit who added the
     description.
---
 arch/riscv/kernel/cpufeature.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index e1f7ad882289..63ad6393b2c6 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -482,7 +482,8 @@ static const unsigned int riscv_supm_exts[] = {
 
 /*
  * 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).
  *
  * Ordinarily, for in-kernel data structures, this order is unimportant but
  * isa_ext_arr defines the order of the ISA string in /proc/cpuinfo.

-- 
2.43.0