linux-kernel - Re: [PATCH net-next V2] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs

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Message-ID: <202509161338.Kq88HUjH-lkp@intel.com>
Date: Tue, 16 Sep 2025 13:45:20 +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: llvm@...ts.linux.dev, 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>,
	Sabrina Dubroca <sd@...asysnail.net>, 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>
Subject: Re: [PATCH net-next V2] 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 1f24a240974589ce42f70502ccb3ff3f5189d69a]

url:    https://github.com/intel-lab-lkp/linux/commits/Tariq-Toukan/net-mlx5-Improve-write-combining-test-reliability-for-ARM64-Grace-CPUs/20250915-163901
base:   1f24a240974589ce42f70502ccb3ff3f5189d69a
patch link:    https://lore.kernel.org/r/1757925308-614943-1-git-send-email-tariqt%40nvidia.com
patch subject: [PATCH net-next V2] net/mlx5: Improve write-combining test reliability for ARM64 Grace CPUs
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20250916/202509161338.Kq88HUjH-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250916/202509161338.Kq88HUjH-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/202509161338.Kq88HUjH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/net/ethernet/mellanox/mlx5/core/lib/wc_neon_iowrite64_copy.c:9:3: error: instruction requires: neon
       9 |         ("ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%0]\n\t"
         |          ^
   <inline asm>:1:2: note: instantiated into assembly here
       1 |         ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [x19]
         |         ^
   drivers/net/ethernet/mellanox/mlx5/core/lib/wc_neon_iowrite64_copy.c:9:48: error: instruction requires: neon
       9 |         ("ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%0]\n\t"
         |                                                       ^
   <inline asm>:2:2: note: instantiated into assembly here
       2 |         st1 {v0.16b, v1.16b, v2.16b, v3.16b}, [x20]
         |         ^
   2 errors generated.


vim +9 drivers/net/ethernet/mellanox/mlx5/core/lib/wc_neon_iowrite64_copy.c

     5	
     6	void mlx5_wc_neon_iowrite64_copy(void __iomem *to, const void *from)
     7	{
     8		asm volatile
   > 9		("ld1 {v0.16b, v1.16b, v2.16b, v3.16b}, [%0]\n\t"

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