linux-kernel - Re: [PATCH net-next V4] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs

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Message-ID: <202509231437.exOuF9vQ-lkp@intel.com>
Date: Tue, 23 Sep 2025 15:19:38 +0800
From: kernel test robot <lkp@...el.com>
To: Tariq Toukan <tariqt@...dia.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>,
	Mark Bloch <mbloch@...dia.com>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, Gal Pressman <gal@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Michael Guralnik <michaelgur@...dia.com>,
	Moshe Shemesh <moshe@...dia.com>, Will Deacon <will@...nel.org>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Justin Stitt <justinstitt@...gle.com>, linux-s390@...r.kernel.org
Subject: Re: [PATCH net-next V4] net/mlx5: Improve write-combining test
 reliability for ARM64 Grace CPUs

Hi Tariq,

kernel test robot noticed the following build errors:

[auto build test ERROR on 312e6f7676e63bbb9b81e5c68e580a9f776cc6f0]

url:    https://github.com/intel-lab-lkp/linux/commits/Tariq-Toukan/net-mlx5-Improve-write-combining-test-reliability-for-ARM64-Grace-CPUs/20250922-161859
base:   312e6f7676e63bbb9b81e5c68e580a9f776cc6f0
patch link:    https://lore.kernel.org/r/1758528951-817323-1-git-send-email-tariqt%40nvidia.com
patch subject: [PATCH net-next V4] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs
config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20250923/202509231437.exOuF9vQ-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250923/202509231437.exOuF9vQ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509231437.exOuF9vQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In function 'mlx5_iowrite64_copy',
       inlined from 'mlx5_wc_post_nop' at drivers/net/ethernet/mellanox/mlx5/core/wc.c:317:2:
>> drivers/net/ethernet/mellanox/mlx5/core/wc.c:268:17: error: unknown register name 'v0' in 'asm'
     268 |                 asm volatile
         |                 ^~~


vim +268 drivers/net/ethernet/mellanox/mlx5/core/wc.c

   261	
   262	static void mlx5_iowrite64_copy(struct mlx5_wc_sq *sq, __be32 mmio_wqe[16],
   263					size_t mmio_wqe_size, unsigned int offset)
   264	{
   265	#ifdef CONFIG_KERNEL_MODE_NEON
   266		if (cpu_has_neon()) {
   267			kernel_neon_begin();
 > 268			asm volatile
   269			(".arch_extension simd;\n\t"
   270			"ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%0]\n\t"
   271			"st1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%1]"
   272			:
   273			: "r"(mmio_wqe), "r"(sq->bfreg.map + offset)
   274			: "memory", "v0", "v1", "v2", "v3");
   275			kernel_neon_end();
   276			return;
   277		}
   278	#endif
   279		__iowrite64_copy(sq->bfreg.map + offset, mmio_wqe,
   280				 mmio_wqe_size / 8);
   281	}
   282	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki