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Message-Id: <20250718072711.3865118-4-zhangchunyan@iscas.ac.cn>
Date: Fri, 18 Jul 2025 15:27:09 +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 V3 3/5] raid6: riscv: Prevent compiler with vector support to build already vectorized code

To avoid the inline assembly code to break what the compiler could have
vectorized, this code must be built without compiler support for vector.

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


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