Re: [PATCH net-next 12/18] net/smc: implement DMB-related operations of loopback

[kernel test robot <lkp@xxxxxxxxx>]

Hi Wen,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Wen-Gu/net-smc-decouple-ism_dev-from-SMC-D-device-dump/20230920-010019
base:   net-next/main
patch link:    https://lore.kernel.org/r/1695134522-126655-13-git-send-email-guwen%40linux.alibaba.com
patch subject: [PATCH net-next 12/18] net/smc: implement DMB-related operations of loopback
config: arc-allmodconfig (https://download.01.org/0day-ci/archive/20230923/202309232327.nzXalNsH-lkp@xxxxxxxxx/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230923/202309232327.nzXalNsH-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309232327.nzXalNsH-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   net/smc/smc_loopback.c: In function 'smc_lo_register_dmb':
>> net/smc/smc_loopback.c:107:30: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     107 |         dmb_node->dma_addr = (dma_addr_t)dmb_node->cpu_addr;
         |                              ^


vim +107 net/smc/smc_loopback.c

    76	
    77	static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
    78				       void *client_priv)
    79	{
    80		struct smc_lo_dmb_node *dmb_node, *tmp_node;
    81		struct smc_lo_dev *ldev = smcd->priv;
    82		int sba_idx, rc;
    83	
    84		/* check space for new dmb */
    85		for_each_clear_bit(sba_idx, ldev->sba_idx_mask, SMC_LODEV_MAX_DMBS) {
    86			if (!test_and_set_bit(sba_idx, ldev->sba_idx_mask))
    87				break;
    88		}
    89		if (sba_idx == SMC_LODEV_MAX_DMBS)
    90			return -ENOSPC;
    91	
    92		dmb_node = kzalloc(sizeof(*dmb_node), GFP_KERNEL);
    93		if (!dmb_node) {
    94			rc = -ENOMEM;
    95			goto err_bit;
    96		}
    97	
    98		dmb_node->sba_idx = sba_idx;
    99		dmb_node->cpu_addr = kzalloc(dmb->dmb_len, GFP_KERNEL |
   100					     __GFP_NOWARN | __GFP_NORETRY |
   101					     __GFP_NOMEMALLOC);
   102		if (!dmb_node->cpu_addr) {
   103			rc = -ENOMEM;
   104			goto err_node;
   105		}
   106		dmb_node->len = dmb->dmb_len;
 > 107		dmb_node->dma_addr = (dma_addr_t)dmb_node->cpu_addr;
   108	
   109	again:
   110		/* add new dmb into hash table */
   111		get_random_bytes(&dmb_node->token, sizeof(dmb_node->token));
   112		write_lock(&ldev->dmb_ht_lock);
   113		hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_node->token) {
   114			if (tmp_node->token == dmb_node->token) {
   115				write_unlock(&ldev->dmb_ht_lock);
   116				goto again;
   117			}
   118		}
   119		hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token);
   120		write_unlock(&ldev->dmb_ht_lock);
   121	
   122		dmb->sba_idx = dmb_node->sba_idx;
   123		dmb->dmb_tok = dmb_node->token;
   124		dmb->cpu_addr = dmb_node->cpu_addr;
   125		dmb->dma_addr = dmb_node->dma_addr;
   126		dmb->dmb_len = dmb_node->len;
   127	
   128		return 0;
   129	
   130	err_node:
   131		kfree(dmb_node);
   132	err_bit:
   133		clear_bit(sba_idx, ldev->sba_idx_mask);
   134		return rc;
   135	}
   136	

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