Re: [PATCH net-next v6 3/6] net: devmem: prepare for autorelease rx token management

[kernel test robot <lkp@intel.com>]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <20251104-scratch-bobbyeshleman-devmem-tcp-token-upstream-v6-3-ea98cf4d40b3@meta.com>
References: <20251104-scratch-bobbyeshleman-devmem-tcp-token-upstream-v6-3-ea98cf4d40b3@meta.com>
TO: Bobby Eshleman <bobbyeshleman@gmail.com>
TO: "David S. Miller" <davem@davemloft.net>
CC: netdev@vger.kernel.org
TO: Eric Dumazet <edumazet@google.com>
TO: Jakub Kicinski <kuba@kernel.org>
TO: Paolo Abeni <pabeni@redhat.com>
TO: Simon Horman <horms@kernel.org>
TO: Kuniyuki Iwashima <kuniyu@google.com>
TO: Willem de Bruijn <willemb@google.com>
TO: Neal Cardwell <ncardwell@google.com>
TO: David Ahern <dsahern@kernel.org>
TO: Arnd Bergmann <arnd@arndb.de>
TO: Jonathan Corbet <corbet@lwn.net>
TO: Andrew Lunn <andrew+netdev@lunn.ch>
TO: Shuah Khan <skhan@linuxfoundation.org>
TO: Mina Almasry <almasrymina@google.com>
CC: linux-kernel@vger.kernel.org
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CC: Stanislav Fomichev <sdf@fomichev.me>
CC: Bobby Eshleman <bobbyeshleman@meta.com>

Hi Bobby,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 255d75ef029f33f75fcf5015052b7302486f7ad2]

url:    https://github.com/intel-lab-lkp/linux/commits/Bobby-Eshleman/net-devmem-rename-tx_vec-to-vec-in-dmabuf-binding/20251105-092703
base:   255d75ef029f33f75fcf5015052b7302486f7ad2
patch link:    https://lore.kernel.org/r/20251104-scratch-bobbyeshleman-devmem-tcp-token-upstream-v6-3-ea98cf4d40b3%40meta.com
patch subject: [PATCH net-next v6 3/6] net: devmem: prepare for autorelease rx token management
:::::: branch date: 16 hours ago
:::::: commit date: 16 hours ago
config: openrisc-randconfig-r073-20251105 (https://download.01.org/0day-ci/archive/20251106/202511060119.MAzcsLoN-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 10.5.0

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>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202511060119.MAzcsLoN-lkp@intel.com/

New smatch warnings:
net/core/sock.c:1107 sock_devmem_dontneed_manual_release() error: uninitialized symbol 'ret'.

Old smatch warnings:
net/core/sock.c:1114 sock_devmem_dontneed_manual_release() error: uninitialized symbol 'ret'.
net/core/sock.c:1118 sock_devmem_dontneed_manual_release() error: uninitialized symbol 'ret'.

vim +/ret +1107 net/core/sock.c

678f6e28b5f6fc Mina Almasry   2024-09-10  1085  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1086  static noinline_for_stack int
45aa39492cf4dd Bobby Eshleman 2025-11-04  1087  sock_devmem_dontneed_manual_release(struct sock *sk, struct dmabuf_token *tokens,
45aa39492cf4dd Bobby Eshleman 2025-11-04  1088  				    unsigned int num_tokens)
45aa39492cf4dd Bobby Eshleman 2025-11-04  1089  {
45aa39492cf4dd Bobby Eshleman 2025-11-04  1090  	struct net_iov *niov;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1091  	unsigned int i, j;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1092  	netmem_ref netmem;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1093  	unsigned int token;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1094  	int num_frags = 0;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1095  	int ret;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1096  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1097  	if (!sk->sk_devmem_info.binding)
45aa39492cf4dd Bobby Eshleman 2025-11-04  1098  		return -EINVAL;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1099  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1100  	for (i = 0; i < num_tokens; i++) {
45aa39492cf4dd Bobby Eshleman 2025-11-04  1101  		for (j = 0; j < tokens[i].token_count; j++) {
45aa39492cf4dd Bobby Eshleman 2025-11-04  1102  			token = tokens[i].token_start + j;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1103  			if (token >= sk->sk_devmem_info.binding->dmabuf->size / PAGE_SIZE)
45aa39492cf4dd Bobby Eshleman 2025-11-04  1104  				break;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1105  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1106  			if (++num_frags > MAX_DONTNEED_FRAGS)
45aa39492cf4dd Bobby Eshleman 2025-11-04 @1107  				return ret;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1108  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1109  			niov = sk->sk_devmem_info.binding->vec[token];
45aa39492cf4dd Bobby Eshleman 2025-11-04  1110  			if (atomic_dec_and_test(&niov->uref)) {
45aa39492cf4dd Bobby Eshleman 2025-11-04  1111  				netmem = net_iov_to_netmem(niov);
45aa39492cf4dd Bobby Eshleman 2025-11-04  1112  				WARN_ON_ONCE(!napi_pp_put_page(netmem));
45aa39492cf4dd Bobby Eshleman 2025-11-04  1113  			}
45aa39492cf4dd Bobby Eshleman 2025-11-04  1114  			ret++;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1115  		}
45aa39492cf4dd Bobby Eshleman 2025-11-04  1116  	}
45aa39492cf4dd Bobby Eshleman 2025-11-04  1117  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1118  	atomic_sub(ret, &sk->sk_devmem_info.outstanding_urefs);
45aa39492cf4dd Bobby Eshleman 2025-11-04  1119  
45aa39492cf4dd Bobby Eshleman 2025-11-04  1120  	return ret;
45aa39492cf4dd Bobby Eshleman 2025-11-04  1121  }
45aa39492cf4dd Bobby Eshleman 2025-11-04  1122  

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