linux-kernel - [PATCH v4 1/9] riscv: vector: add a comment when calling riscv_setup

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Message-Id: <20240412-zve-detection-v4-1-e0c45bb6b253@sifive.com>
Date: Fri, 12 Apr 2024 14:48:57 +0800
From: Andy Chiu <andy.chiu@...ive.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Conor Dooley <conor.dooley@...rochip.com>, Heiko Stuebner <heiko@...ech.de>, 
 Andy Chiu <andy.chiu@...ive.com>, Guo Ren <guoren@...nel.org>, 
 Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Jonathan Corbet <corbet@....net>, Evan Green <evan@...osinc.com>, 
 Clément Léger <cleger@...osinc.com>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Palmer Dabbelt <palmer@...osinc.com>, 
 Vincent Chen <vincent.chen@...ive.com>, 
 Greentime Hu <greentime.hu@...ive.com>, devicetree@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v4 1/9] riscv: vector: add a comment when calling
 riscv_setup_vsize()

The function would fail when it detects the calling hart's vlen doesn't
match the first one's. The boot hart is the first hart calling this
function during riscv_fill_hwcap, so it is impossible to fail here. Add
a comment about this behavior.

Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
---
Changelog v2:
 - update the comment (Conor)
---
 arch/riscv/kernel/cpufeature.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 3ed2359eae35..d22b12072579 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -683,6 +683,10 @@ void __init riscv_fill_hwcap(void)
 	}
 
 	if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
+		/*
+		 * This callsite can't fail here. It cannot fail when called on
+		 * the boot hart.
+		 */
 		riscv_v_setup_vsize();
 		/*
 		 * ISA string in device tree might have 'v' flag, but

-- 
2.44.0.rc2