linux-kernel - [PATCH V2 3/5] raid6: riscv: Add a compiler error

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Message-Id: <20250711100930.3398336-4-zhangchunyan@iscas.ac.cn>
Date: Fri, 11 Jul 2025 18:09:28 +0800
From: Chunyan Zhang <zhangchunyan@...as.ac.cn>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Charlie Jenkins <charlie@...osinc.com>,
	Song Liu <song@...nel.org>,
	Yu Kuai <yukuai3@...wei.com>
Cc: linux-riscv@...ts.infradead.org,
	linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH V2 3/5] raid6: riscv: Add a compiler error

The code like "u8 **dptr = (u8 **)ptrs" just won't work when built with
a compiler that can use vector instructions. So add an error for that.

Signed-off-by: Chunyan Zhang <zhangchunyan@...as.ac.cn>
---
 lib/raid6/rvv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/raid6/rvv.c b/lib/raid6/rvv.c
index 89da5fc247aa..015f3ee4da25 100644
--- a/lib/raid6/rvv.c
+++ b/lib/raid6/rvv.c
@@ -20,6 +20,10 @@ static int rvv_has_vector(void)
 	return has_vector();
 }
 
+#ifdef __riscv_vector
+#error "This code must be built without compiler support for vector"
+#endif
+
 static void raid6_rvv1_gen_syndrome_real(int disks, unsigned long bytes, void **ptrs)
 {
 	u8 **dptr = (u8 **)ptrs;
-- 
2.34.1