Re: [PATCH v3 5/5] minmax: Relax check to allow comparison between int and small unsigned constants.

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "low confidence static check first_new_problem: net/ceph/messenger.c:790:9: sparse: sparse: too long token expansion"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
In-Reply-To: <b6a49ed73aba427ca8bb433763fa94e9@AcuMS.aculab.com>
References: <b6a49ed73aba427ca8bb433763fa94e9@AcuMS.aculab.com>
TO: David Laight <David.Laight@ACULAB.COM>
TO: "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
TO: "'Andy Shevchenko'" <andriy.shevchenko@linux.intel.com>
TO: "'Andrew Morton'" <akpm@linux-foundation.org>
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: "'Matthew Wilcox (Oracle)'" <willy@infradead.org>
TO: "'Christoph Hellwig'" <hch@infradead.org>
TO: "'Jason A. Donenfeld'" <Jason@zx2c4.com>
TO: "'Linus Torvalds'" <torvalds@linux-foundation.org>

Hi David,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.5-rc4 next-20230804]
[cannot apply to next-20230804 akpm-mm/mm-everything]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/David-Laight/minmax-Add-min_unsigned-a-b-and-max_unsigned-a-b/20230804-190414
base:   linus/master
patch link:    https://lore.kernel.org/r/b6a49ed73aba427ca8bb433763fa94e9%40AcuMS.aculab.com
patch subject: [PATCH v3 5/5] minmax: Relax check to allow comparison between int and small unsigned constants.
:::::: branch date: 12 hours ago
:::::: commit date: 12 hours ago
config: um-randconfig-r091-20230730 (https://download.01.org/0day-ci/archive/20230805/202308050640.uLl9ePSK-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230805/202308050640.uLl9ePSK-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@intel.com>
| Closes: https://lore.kernel.org/r/202308050640.uLl9ePSK-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> net/ceph/messenger.c:790:9: sparse: sparse: too long token expansion
>> net/ceph/messenger.c:790:9: sparse: sparse: too long token expansion
   net/ceph/messenger.c:797:29: sparse: sparse: too long token expansion
   net/ceph/messenger.c:797:29: sparse: sparse: too long token expansion
   net/ceph/messenger.c:812:9: sparse: sparse: too long token expansion
   net/ceph/messenger.c:812:9: sparse: sparse: too long token expansion
   net/ceph/messenger.c:823:9: sparse: sparse: too long token expansion
   net/ceph/messenger.c:823:9: sparse: sparse: too long token expansion
--
>> net/ipv6/proc.c:186:28: sparse: sparse: too long token expansion
   net/ipv6/proc.c:190:57: sparse: sparse: too long token expansion
   net/ipv6/proc.c:206:20: sparse: sparse: too long token expansion
   net/ipv6/proc.c:209:41: sparse: sparse: too long token expansion

vim +790 net/ceph/messenger.c

df6ad1f97342eb Alex Elder   2012-06-11  779  
b9e281c2b38804 Ilya Dryomov 2018-01-20  780  static void ceph_msg_data_bvecs_cursor_init(struct ceph_msg_data_cursor *cursor,
b9e281c2b38804 Ilya Dryomov 2018-01-20  781  					size_t length)
b9e281c2b38804 Ilya Dryomov 2018-01-20  782  {
b9e281c2b38804 Ilya Dryomov 2018-01-20  783  	struct ceph_msg_data *data = cursor->data;
b9e281c2b38804 Ilya Dryomov 2018-01-20  784  	struct bio_vec *bvecs = data->bvec_pos.bvecs;
b9e281c2b38804 Ilya Dryomov 2018-01-20  785  
b9e281c2b38804 Ilya Dryomov 2018-01-20  786  	cursor->resid = min_t(size_t, length, data->bvec_pos.iter.bi_size);
b9e281c2b38804 Ilya Dryomov 2018-01-20  787  	cursor->bvec_iter = data->bvec_pos.iter;
b9e281c2b38804 Ilya Dryomov 2018-01-20  788  	cursor->bvec_iter.bi_size = cursor->resid;
b9e281c2b38804 Ilya Dryomov 2018-01-20  789  
b9e281c2b38804 Ilya Dryomov 2018-01-20 @790  	BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter));
b9e281c2b38804 Ilya Dryomov 2018-01-20  791  }
b9e281c2b38804 Ilya Dryomov 2018-01-20  792  

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