Re: [PATCH net-next 12/18] net/smc: implement DMB-related operations of loopback
From: Wen Gu
Date: Sun Sep 24 2023 - 04:54:17 EST
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@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;
| ^
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