Re: [PATCH net-next 12/12] net: homa: create Makefile and Kconfig

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

Hi John,

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/John-Ousterhout/net-homa-define-user-visible-API-for-Homa/20241029-095137
base:   net-next/main
patch link:    https://lore.kernel.org/r/20241028213541.1529-13-ouster%40cs.stanford.edu
patch subject: [PATCH net-next 12/12] net: homa: create Makefile and Kconfig
config: arc-randconfig-r132-20241029 (https://download.01.org/0day-ci/archive/20241030/202410300823.rFSVqCH5-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20241030/202410300823.rFSVqCH5-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/202410300823.rFSVqCH5-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   net/homa/homa_rpc.c: note: in included file:
>> net/homa/homa_impl.h:605:13: sparse: sparse: restricted __be32 degrades to integer
   net/homa/homa_rpc.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   net/homa/homa_rpc.c:84:9: sparse: sparse: context imbalance in 'homa_rpc_new_client' - different lock contexts for basic block
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   net/homa/homa_rpc.c:104:17: sparse: sparse: context imbalance in 'homa_rpc_new_server' - wrong count at exit
   net/homa/homa_rpc.c: note: in included file (through include/linux/rculist.h, include/linux/sched/signal.h, include/linux/ptrace.h, ...):
   include/linux/rcupdate.h:881:9: sparse: sparse: context imbalance in 'homa_rpc_acked' - unexpected unlock
   net/homa/homa_rpc.c: note: in included file (through include/linux/smp.h, include/linux/lockdep.h, include/linux/spinlock.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true
   net/homa/homa_rpc.c:235:6: sparse: sparse: context imbalance in 'homa_rpc_free' - different lock contexts for basic block
   net/homa/homa_rpc.c:311:5: sparse: sparse: context imbalance in 'homa_rpc_reap' - wrong count at exit
   net/homa/homa_rpc.c:448:17: sparse: sparse: context imbalance in 'homa_find_client_rpc' - wrong count at exit
   net/homa/homa_rpc.c:474:17: sparse: sparse: context imbalance in 'homa_find_server_rpc' - wrong count at exit
--
>> net/homa/homa_sock.c:85:39: sparse: sparse: cast removes address space '__rcu' of expression
   net/homa/homa_sock.c:91:31: sparse: sparse: cast removes address space '__rcu' of expression
   net/homa/homa_sock.c:165:6: sparse: sparse: context imbalance in 'homa_sock_shutdown' - wrong count at exit
   net/homa/homa_sock.c:243:5: sparse: sparse: context imbalance in 'homa_sock_bind' - different lock contexts for basic block
   net/homa/homa_sock.c:312:6: sparse: sparse: context imbalance in 'homa_sock_lock_slow' - wrong count at exit
   net/homa/homa_sock.c:326:6: sparse: sparse: context imbalance in 'homa_bucket_lock_slow' - wrong count at exit

vim +605 net/homa/homa_impl.h

1416f12d4ea455 John Ousterhout 2024-10-28  595  
1416f12d4ea455 John Ousterhout 2024-10-28  596  /**
1416f12d4ea455 John Ousterhout 2024-10-28  597   * Given an IPv4 address, return an equivalent IPv6 address (an IPv4-mapped
1416f12d4ea455 John Ousterhout 2024-10-28  598   * one)
1416f12d4ea455 John Ousterhout 2024-10-28  599   * @ip4: IPv4 address, in network byte order.
1416f12d4ea455 John Ousterhout 2024-10-28  600   */
1416f12d4ea455 John Ousterhout 2024-10-28  601  static inline struct in6_addr ipv4_to_ipv6(__be32 ip4)
1416f12d4ea455 John Ousterhout 2024-10-28  602  {
1416f12d4ea455 John Ousterhout 2024-10-28  603  	struct in6_addr ret = {};
1416f12d4ea455 John Ousterhout 2024-10-28  604  
1416f12d4ea455 John Ousterhout 2024-10-28 @605  	if (ip4 == INADDR_ANY)
1416f12d4ea455 John Ousterhout 2024-10-28  606  		return in6addr_any;
1416f12d4ea455 John Ousterhout 2024-10-28  607  	ret.in6_u.u6_addr32[2] = htonl(0xffff);
1416f12d4ea455 John Ousterhout 2024-10-28  608  	ret.in6_u.u6_addr32[3] = ip4;
1416f12d4ea455 John Ousterhout 2024-10-28  609  	return ret;
1416f12d4ea455 John Ousterhout 2024-10-28  610  }
1416f12d4ea455 John Ousterhout 2024-10-28  611  

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