Subject: Re: [PATCH net-next 6/9] hsr: Implement more robust duplicate discard for HSR

From: kernel test robot <[email-masked]>
Date: Thu, 22 Jan 2026 05:52:14 +0800

Hi Felix,

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/Felix-Maurer/selftests-hsr-Add-ping-test-for-PRP/20260121-221431
base:   net-next/main
patch link:    https://lore.kernel.org/r/a58f3b542fd8564c5d9576a10a9d6c9a7f318931.1769001553.git.fmaurer%40redhat.com
patch subject: [PATCH net-next 6/9] hsr: Implement more robust duplicate discard for HSR
config: alpha-randconfig-r073-20260122 (https://download.01.org/0day-ci/archive/20260122/[email-masked]/config)
compiler: alpha-linux-gcc (GCC) 12.5.0
smatch version: v0.5.0-8985-g2614ff1a
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

   net/hsr/hsr_framereg.c: In function 'fill_last_seq_nrs':
>> net/hsr/hsr_framereg.c:781:22: warning: variable 'block_off' set but not used [-Wunused-but-set-variable]
     781 |         unsigned int block_off;
         |                      ^~~~~~~~~

vim +/block_off +781 net/hsr/hsr_framereg.c

   773	
   774	/* Fill the last sequence number that has been received from node on if1 by
   775	 * finding the last sequence number sent on port B; accordingly get the last
   776	 * received sequence number for if2 using sent sequence numbers on port A.
   777	 */
   778	static void fill_last_seq_nrs(struct hsr_node *node, u16 *if1_seq, u16 *if2_seq)
   779	{
   780		struct hsr_seq_block *block;
 > 781		unsigned int block_off;
   782		size_t block_sz;
   783		u16 seq_bit;
   784	
   785		spin_lock_bh(&node->seq_out_lock);
   786	
   787		// Get last inserted block
   788		block_off = (node->next_block - 1) & (HSR_MAX_SEQ_BLOCKS - 1);
   789		block_sz = hsr_seq_block_size(node);
   790		block = node->block_buf + node->next_block * block_sz;
   791	
   792		if (!bitmap_empty(block->seq_nrs[HSR_PT_SLAVE_B - 1],
   793				  HSR_SEQ_BLOCK_SIZE)) {
   794			seq_bit = find_last_bit(block->seq_nrs[HSR_PT_SLAVE_B - 1],
   795						HSR_SEQ_BLOCK_SIZE);
   796			*if1_seq = (block->block_idx << HSR_SEQ_BLOCK_SHIFT) | seq_bit;
   797		}
   798		if (!bitmap_empty(block->seq_nrs[HSR_PT_SLAVE_A - 1],
   799				  HSR_SEQ_BLOCK_SIZE)) {
   800			seq_bit = find_last_bit(block->seq_nrs[HSR_PT_SLAVE_A - 1],
   801						HSR_SEQ_BLOCK_SIZE);
   802			*if2_seq = (block->block_idx << HSR_SEQ_BLOCK_SHIFT) | seq_bit;
   803		}
   804		spin_unlock_bh(&node->seq_out_lock);
   805	}
   806	

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