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Message-Id: <20240510-zve-detection-v5-1-0711bdd26c12@sifive.com>
Date: Fri, 10 May 2024 00:26:51 +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 v5 1/8] 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>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
---
Changelog v2, v5:
- update the comment (Conor)
---
arch/riscv/kernel/cpufeature.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 3ed2359eae35..15ffda1968d8 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -683,6 +683,9 @@ void __init riscv_fill_hwcap(void)
}
if (elf_hwcap & COMPAT_HWCAP_ISA_V) {
+ /*
+ * This 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
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