linux-kernel - include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar

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Message-ID: <202505300908.fNWr1zST-lkp@intel.com>
Date: Fri, 30 May 2025 09:53:42 +0800
From: kernel test robot <lkp@...el.com>
To: Petr Machata <petrm@...dia.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>, Ido Schimmel <idosch@...dia.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	David Ahern <dsahern@...nel.org>
Subject: include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e0797d3b91de75b6c95b4a0e0649ebd4aac1d9d1
commit: 4ee2a8cace3fb9a34aea6a56426f89d26dd514f3 net: ipv4: Add a sysctl to set multipath hash seed
date:   12 months ago
config: arm64-randconfig-r123-20250529 (https://download.01.org/0day-ci/archive/20250530/202505300908.fNWr1zST-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce: (https://download.01.org/0day-ci/archive/20250530/202505300908.fNWr1zST-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/202505300908.fNWr1zST-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   net/ipv4/route.c: note: in included file (through include/linux/mroute_base.h, include/linux/mroute.h):
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast to non-scalar
>> include/net/ip_fib.h:539:19: sparse: sparse: cast from non-scalar

vim +539 include/net/ip_fib.h

   532	
   533	static inline u32 fib_multipath_hash_from_keys(const struct net *net,
   534						       struct flow_keys *keys)
   535	{
   536		siphash_aligned_key_t hash_key;
   537		u32 mp_seed;
   538	
 > 539		mp_seed = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed).mp_seed;
   540		fib_multipath_hash_construct_key(&hash_key, mp_seed);
   541	
   542		return flow_hash_from_keys_seed(keys, &hash_key);
   543	}
   544	#else
   545	static inline u32 fib_multipath_hash_from_keys(const struct net *net,
   546						       struct flow_keys *keys)
   547	{
   548		return flow_hash_from_keys(keys);
   549	}
   550	#endif
   551	

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