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

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Message-ID: <41d1f41f-737a-7705-c09d-f3678387f8d4@linux.alibaba.com>
Date:   Sun, 24 Sep 2023 16:54:07 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     kernel test robot <lkp@...el.com>, kgraul@...ux.ibm.com,
        wenjia@...ux.ibm.com, jaka@...ux.ibm.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     oe-kbuild-all@...ts.linux.dev, alibuda@...ux.alibaba.com,
        tonylu@...ux.alibaba.com, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 12/18] net/smc: implement DMB-related operations
 of loopback



On 2023/9/23 23:24, kernel test robot wrote:
> 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@intel.com/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@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/202309232327.nzXalNsH-lkp@intel.com/
> 
> 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;
>           |                              ^
> 
> 

Will fix it on v4. Thanks!

> 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	
>