Received-SPF: pass (google.com: domain of linux-kernel+bounces-156497-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Date: Wed, 24 Apr 2024 15:41:59 +0800
From: kernel test robot <lkp@intel.com>
To: Joe Damato <jdamato@fastly.com>, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, tariqt@nvidia.com, saeedm@nvidia.com
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	mkarsten@uwaterloo.ca, gal@nvidia.com, nalramli@fastly.com,
	Joe Damato <jdamato@fastly.com>, Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	linux-rdma@vger.kernel.org
Subject: Re: [PATCH net-next 2/3] net/mlx4: link NAPI instances to queues and
 IRQs
Message-ID: <202404241518.4TvjoN07-lkp@intel.com>
References: <20240423194931.97013-3-jdamato@fastly.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240423194931.97013-3-jdamato@fastly.com>

Hi Joe,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Joe-Damato/net-mlx4-Track-RX-allocation-failures-in-a-stat/20240424-035224
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240423194931.97013-3-jdamato%40fastly.com
patch subject: [PATCH net-next 2/3] net/mlx4: link NAPI instances to queues and IRQs
config: s390-defconfig (https://download.01.org/0day-ci/archive/20240424/202404241518.4TvjoN07-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 5ef5eb66fb428aaf61fb51b709f065c069c11242)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240424/202404241518.4TvjoN07-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404241518.4TvjoN07-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/net/ethernet/mellanox/mlx4/en_cq.c:34:
   In file included from include/linux/mlx4/cq.h:39:
   In file included from include/linux/mlx4/device.h:37:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     547 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     560 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
         |                                                           ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
     102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
         |                                                      ^
   In file included from drivers/net/ethernet/mellanox/mlx4/en_cq.c:34:
   In file included from include/linux/mlx4/cq.h:39:
   In file included from include/linux/mlx4/device.h:37:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     573 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
         |                                                           ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
     115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
         |                                                      ^
   In file included from drivers/net/ethernet/mellanox/mlx4/en_cq.c:34:
   In file included from include/linux/mlx4/cq.h:39:
   In file included from include/linux/mlx4/device.h:37:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:11:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:78:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     584 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     594 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     604 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     692 |         readsb(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     700 |         readsw(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     708 |         readsl(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     717 |         writesb(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     726 |         writesw(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     735 |         writesl(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
>> drivers/net/ethernet/mellanox/mlx4/en_cq.c:202:12: warning: variable 'qtype' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     202 |                 else if (cq->type == TX)
         |                          ^~~~~~~~~~~~~~
   drivers/net/ethernet/mellanox/mlx4/en_cq.c:205:45: note: uninitialized use occurs here
     205 |                 netif_queue_set_napi(cq->dev, cq->cq_idx, qtype, NULL);
         |                                                           ^~~~~
   drivers/net/ethernet/mellanox/mlx4/en_cq.c:202:8: note: remove the 'if' if its condition is always true
     202 |                 else if (cq->type == TX)
         |                      ^~~~~~~~~~~~~~~~~~~
     203 |                         qtype = NETDEV_QUEUE_TYPE_TX;
   drivers/net/ethernet/mellanox/mlx4/en_cq.c:197:2: note: variable 'qtype' is declared here
     197 |         enum netdev_queue_type qtype;
         |         ^
   18 warnings generated.


vim +202 drivers/net/ethernet/mellanox/mlx4/en_cq.c

   194	
   195	void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
   196	{
   197		enum netdev_queue_type qtype;
   198	
   199		if (cq->type != TX_XDP) {
   200			if (cq->type == RX)
   201				qtype = NETDEV_QUEUE_TYPE_RX;
 > 202			else if (cq->type == TX)
   203				qtype = NETDEV_QUEUE_TYPE_TX;
   204	
   205			netif_queue_set_napi(cq->dev, cq->cq_idx, qtype, NULL);
   206			napi_disable(&cq->napi);
   207			netif_napi_del(&cq->napi);
   208		}
   209	
   210		mlx4_cq_free(priv->mdev->dev, &cq->mcq);
   211	}
   212	

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