From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Date: Thu, 4 Sep 2025 11:31:44 +0200

On Wed, Sep 03, 2025 at 10:29:02AM +0800, kernel test robot wrote:

quoted

Hi Maciej,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Maciej-Fijalkowski/xsk-fix-immature-cq-descriptor-production/20250903-060850
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link:    https://lore.kernel.org/r/20250902220613.2331265-1-maciej.fijalkowski%40intel.com
patch subject: [PATCH v8 bpf] xsk: fix immature cq descriptor production
config: riscv-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509031029.iL7rCVvQ-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509031029.iL7rCVvQ-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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202509031029.iL7rCVvQ-lkp@intel.com/ (local)

All warnings (new ones prefixed by >>):

   net/xdp/xsk.c: In function 'xsk_cq_submit_addr_locked':

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net/xdp/xsk.c:572:38: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]

     xskq_prod_write_addr(pool->cq, idx, (u64)skb_shinfo(skb)->destructor_arg);
                                         ^
   net/xdp/xsk.c: In function 'xsk_set_destructor_arg':

quoted

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net/xdp/xsk.c:625:36: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

     skb_shinfo(skb)->destructor_arg = (void *)addr;

Meh, I suppose uintptr_t casting will help here.

Correct, you need a double cast to convert u64 <-> void *, see [0].

Maybe we'd want to make those helpers generic in future...

So I'll send v9 in the evening :)

[0]
https://elixir.bootlin.com/linux/v6.17-rc4/source/include/net/libeth/xdp.h#L475

Thanks,
Olek