Re: [PATCH bpf-next] bpf: Add multi-prog support for XDP BPF programs

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

Hi Ryan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Ryan-Wilson/bpf-Add-multi-prog-support-for-XDP-BPF-programs/20241115-015104
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20241114170721.3939099-1-ryantimwilson%40gmail.com
patch subject: [PATCH bpf-next] bpf: Add multi-prog support for XDP BPF programs
config: x86_64-randconfig-122-20241117 (https://download.01.org/0day-ci/archive/20241117/202411172107.yHI94Ps2-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241117/202411172107.yHI94Ps2-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/202411172107.yHI94Ps2-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   net/core/dev.c:3387:23: sparse: sparse: incorrect type in argument 4 (different base types) @@     expected restricted __wsum [usertype] csum @@     got unsigned int @@
   net/core/dev.c:3387:23: sparse:     expected restricted __wsum [usertype] csum
   net/core/dev.c:3387:23: sparse:     got unsigned int
   net/core/dev.c:3387:23: sparse: sparse: cast from restricted __wsum
>> net/core/dev.c:9416:76: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct bpf_mprog_entry *entry @@     got struct bpf_mprog_entry [noderef] __rcu * @@
   net/core/dev.c:9416:76: sparse:     expected struct bpf_mprog_entry *entry
   net/core/dev.c:9416:76: sparse:     got struct bpf_mprog_entry [noderef] __rcu *
   net/core/dev.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/xarray.h, ...):
   include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
   include/linux/page-flags.h:237:46: sparse: sparse: self-comparison always evaluates to false
   net/core/dev.c:3837:17: sparse: sparse: context imbalance in '__dev_queue_xmit' - different lock contexts for basic block
   net/core/dev.c:4800:9: sparse: sparse: context imbalance in 'kick_defer_list_purge' - different lock contexts for basic block
   net/core/dev.c:4901:19: sparse: sparse: context imbalance in 'enqueue_to_backlog' - different lock contexts for basic block
   net/core/dev.c:5315:17: sparse: sparse: context imbalance in 'net_tx_action' - different lock contexts for basic block
   net/core/dev.c:5996:9: sparse: sparse: context imbalance in 'flush_backlog' - different lock contexts for basic block
   net/core/dev.c:6123:9: sparse: sparse: context imbalance in 'process_backlog' - different lock contexts for basic block

vim +9416 net/core/dev.c

  9409	
  9410	u8 dev_xdp_prog_count(struct net_device *dev)
  9411	{
  9412		u8 count = 0;
  9413		int i;
  9414	
  9415		for (i = 0; i < __MAX_XDP_MODE; i++)
> 9416			if (dev->xdp_state[i] && xdp_entry_is_active(dev->xdp_state[i]))
  9417				count++;
  9418		return count;
  9419	}
  9420	EXPORT_SYMBOL_GPL(dev_xdp_prog_count);
  9421	

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