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Subjectnet/core/dev.c:10290:18: sparse: sparse: cast removes address space '__percpu' of expression
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d0e60d46bc03252b8d4ffaaaa0b371970ac16cda
commit: 625788b5844511cf4c30cffa7fa0bc3a69cebc82 net: add per-cpu storage and net->core_stats
date: 3 months ago
config: riscv-allyesconfig (https://download.01.org/0day-ci/archive/20220605/202206050845.IJUsAUy8-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-18-g56afb504-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=625788b5844511cf4c30cffa7fa0bc3a69cebc82
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 625788b5844511cf4c30cffa7fa0bc3a69cebc82
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash net/core/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
net/core/dev.c:3254:23: sparse: sparse: incorrect type in argument 4 (different base types) @@ expected restricted __wsum [usertype] csum @@ got unsigned int @@
net/core/dev.c:3254:23: sparse: expected restricted __wsum [usertype] csum
net/core/dev.c:3254:23: sparse: got unsigned int
net/core/dev.c:3254:23: sparse: sparse: cast from restricted __wsum
>> net/core/dev.c:10290:18: sparse: sparse: cast removes address space '__percpu' of expression
net/core/dev.c:3759:17: sparse: sparse: context imbalance in '__dev_queue_xmit' - different lock contexts for basic block
net/core/dev.c:4961:17: sparse: sparse: context imbalance in 'net_tx_action' - different lock contexts for basic block

vim +/__percpu +10290 net/core/dev.c

10282
10283 struct net_device_core_stats *netdev_core_stats_alloc(struct net_device *dev)
10284 {
10285 struct net_device_core_stats __percpu *p;
10286
10287 p = alloc_percpu_gfp(struct net_device_core_stats,
10288 GFP_ATOMIC | __GFP_NOWARN);
10289
10290 if (p && cmpxchg(&dev->core_stats, NULL, p))
10291 free_percpu(p);
10292
10293 /* This READ_ONCE() pairs with the cmpxchg() above */
10294 p = READ_ONCE(dev->core_stats);
10295 if (!p)
10296 return NULL;
10297
10298 return this_cpu_ptr(p);
10299 }
10300 EXPORT_SYMBOL(netdev_core_stats_alloc);
10301

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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