Re: [PATCH net-next V6] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs
From: Sebastian Ott <hidden>
Date: 2025-10-06 13:57:50
Also in:
linux-arch, linux-patches, linux-rdma, linux-s390, lkml, llvm
On Mon, 29 Sep 2025, Tariq Toukan wrote:
+static void mlx5_iowrite64_copy(struct mlx5_wc_sq *sq, __be32 mmio_wqe[16],
+ size_t mmio_wqe_size, unsigned int offset)
+{
+#if IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && IS_ENABLED(CONFIG_ARM64)
+ if (cpu_has_neon()) {
+ kernel_neon_begin();
+ asm volatile
+ (".arch_extension simd;\n\t"
+ "ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%0]\n\t"
+ "st1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%1]"
+ :
+ : "r"(mmio_wqe), "r"(sq->bfreg.map + offset)
+ : "memory", "v0", "v1", "v2", "v3");
+ kernel_neon_end();
+ return;
+ }
+#endifThis one breaks the build for me: /tmp/cc2vw3CJ.s: Assembler messages: /tmp/cc2vw3CJ.s:391: Error: unknown architectural extension `simd;' Removing the extra ";" after simd seems to fix it. Regards, Sebastian