Re: [PATCH] ipvs: add a stateless type of service and a stateless Maglev hashing scheduler

Hi Lev,

kernel test robot noticed the following build warnings:

[auto build test WARNING on horms-ipvs-next/master]
[also build test WARNING on horms-ipvs/master linus/master v6.7-rc4 next-20231206]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Lev-Pantiukhin/ipvs-add-a-stateless-type-of-service-and-a-stateless-Maglev-hashing-scheduler/20231204-232344
base:   https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs-next.git master
patch link:    https://lore.kernel.org/r/20231204152020.472247-1-kndrvt%40yandex-team.ru
patch subject: [PATCH] ipvs: add a stateless type of service and a stateless Maglev hashing scheduler
config: microblaze-randconfig-r123-20231206 (https://download.01.org/0day-ci/archive/20231206/[email protected]/config)
compiler: microblaze-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231206/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

sparse warnings: (new ones prefixed by >>)
>> net/netfilter/ipvs/ip_vs_ctl.c:972:42: sparse: sparse: restricted __be32 degrades to integer
   net/netfilter/ipvs/ip_vs_ctl.c:972:60: sparse: sparse: restricted __be32 degrades to integer
   net/netfilter/ipvs/ip_vs_ctl.c:976:48: sparse: sparse: restricted __be32 degrades to integer
   net/netfilter/ipvs/ip_vs_ctl.c:976:70: sparse: sparse: restricted __be32 degrades to integer
>> net/netfilter/ipvs/ip_vs_ctl.c:976:30: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __be32 [usertype] diff @@     got unsigned int @@
   net/netfilter/ipvs/ip_vs_ctl.c:976:30: sparse:     expected restricted __be32 [usertype] diff
   net/netfilter/ipvs/ip_vs_ctl.c:976:30: sparse:     got unsigned int
>> net/netfilter/ipvs/ip_vs_ctl.c:978:41: sparse: sparse: cast from restricted __be32
   net/netfilter/ipvs/ip_vs_ctl.c:1532:27: sparse: sparse: dereference of noderef expression

vim +972 net/netfilter/ipvs/ip_vs_ctl.c

   962	
   963	static int __ip_vs_mh_compare_dests(struct list_head *a, struct list_head *b)
   964	{
   965		struct ip_vs_dest *dest_a = list_entry(a, struct ip_vs_dest, n_list);
   966		struct ip_vs_dest *dest_b = list_entry(b, struct ip_vs_dest, n_list);
   967		unsigned int i = 0;
   968		__be32 diff;
   969	
   970		switch (dest_a->af) {
   971		case AF_INET:
 > 972			return (int)(dest_a->addr.ip - dest_b->addr.ip);
   973	
   974		case AF_INET6:
   975			for (; i < ARRAY_SIZE(dest_a->addr.ip6); i++) {
 > 976				diff = dest_a->addr.ip6[i] - dest_b->addr.ip6[i];
   977				if (diff)
 > 978					return (int)diff;
   979			}
   980		}
   981	
   982		return 0;
   983	}
   984	

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