Re: [PATCH net-next V6] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs
From: "Arnd Bergmann" <arnd@arndb.de>
Date: 2025-10-06 13:59:57
Also in:
linux-arch, linux-patches, linux-rdma, linux-s390, lkml, llvm
On Mon, Oct 6, 2025, at 15:57, Sebastian Ott wrote:
On Mon, 29 Sep 2025, Tariq Toukan wrote:quoted
+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.
I sent that fixup earlier today: https://lore.kernel.org/all/20251006115640.497169-1-arnd@kernel.org/ (local) Arnd