[bcache:nvdimm-meta 7/16] drivers/md/bcache/nvm-pages.c:138:3: warning: 'strncpy' output truncated before terminating nul copying 16 bytes from a string of the same length

[bcache:nvdimm-meta 7/16] drivers/md/bcache/nvm-pages.c:138:3: warning: 'strncpy' output truncated before terminating nul copying 16 bytes from a string of the same length

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/colyli/linux-bcache.git nvdimm-meta
head:   be0f72faa6d269aa7d824296859cd055f0ba61a0
commit: 1c09ce1d2b048fd2b49d2f85c5bb208c65b645b9 [7/16] bcache: use helper routines to get/set bch_pgalloc_rec pgoff and order
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/colyli/linux-bcache.git/commit/?id=1c09ce1d2b048fd2b49d2f85c5bb208c65b645b9
        git remote add bcache https://git.kernel.org/pub/scm/linux/kernel/git/colyli/linux-bcache.git
        git fetch --no-tags bcache nvdimm-meta
        git checkout 1c09ce1d2b048fd2b49d2f85c5bb208c65b645b9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In function 'find_nvm_pgalloc_recs',
       inlined from 'bch_nvm_alloc_pages' at drivers/md/bcache/nvm-pages.c:364:19:
>> drivers/md/bcache/nvm-pages.c:138:3: warning: 'strncpy' output truncated before terminating nul copying 16 bytes from a string of the same length [-Wstringop-truncation]
     138 |   strncpy(recs->magic, bch_nvm_pages_pgalloc_magic, 16);
         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for FRAME_POINTER
   Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS
   Selected by
   - FAULT_INJECTION_STACKTRACE_FILTER && FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT && !X86_64 && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86


vim +/strncpy +138 drivers/md/bcache/nvm-pages.c

87ac110b7d6f58 Jianpeng Ma 2021-03-17  111  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  112  static struct bch_nvm_pgalloc_recs *find_nvm_pgalloc_recs(struct bch_nvm_namespace *ns,
87ac110b7d6f58 Jianpeng Ma 2021-03-17  113  		struct bch_nvm_pages_owner_head *owner_head, bool create)
87ac110b7d6f58 Jianpeng Ma 2021-03-17  114  {
87ac110b7d6f58 Jianpeng Ma 2021-03-17  115  	int ns_nr = ns->sb->this_namespace_nr;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  116  	struct bch_nvm_pgalloc_recs *prev_recs = NULL, *recs = owner_head->recs[ns_nr];
87ac110b7d6f58 Jianpeng Ma 2021-03-17  117  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  118  	// If create=false, we return recs[nr]
87ac110b7d6f58 Jianpeng Ma 2021-03-17  119  	if (!create)
87ac110b7d6f58 Jianpeng Ma 2021-03-17  120  		return recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  121  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  122  	// If create=true, it mean we need a empty struct bch_pgalloc_rec
87ac110b7d6f58 Jianpeng Ma 2021-03-17  123  	// So we should find non-empty struct bch_nvm_pgalloc_recs or alloc
87ac110b7d6f58 Jianpeng Ma 2021-03-17  124  	// new struct bch_nvm_pgalloc_recs. And return this bch_nvm_pgalloc_recs
87ac110b7d6f58 Jianpeng Ma 2021-03-17  125  	while (recs && (recs->used == recs->size)) {
87ac110b7d6f58 Jianpeng Ma 2021-03-17  126  		prev_recs = recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  127  		recs = recs->next;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  128  	}
87ac110b7d6f58 Jianpeng Ma 2021-03-17  129  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  130  	// Found empty struct bch_nvm_pgalloc_recs
87ac110b7d6f58 Jianpeng Ma 2021-03-17  131  	if (recs)
87ac110b7d6f58 Jianpeng Ma 2021-03-17  132  		return recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  133  	// Need alloc new struct bch_nvm_galloc_recs
87ac110b7d6f58 Jianpeng Ma 2021-03-17  134  	recs = find_empty_pgalloc_recs();
87ac110b7d6f58 Jianpeng Ma 2021-03-17  135  	if (recs) {
87ac110b7d6f58 Jianpeng Ma 2021-03-17  136  		recs->next = NULL;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  137  		recs->owner = owner_head;
87ac110b7d6f58 Jianpeng Ma 2021-03-17 @138  		strncpy(recs->magic, bch_nvm_pages_pgalloc_magic, 16);
87ac110b7d6f58 Jianpeng Ma 2021-03-17  139  		strncpy(recs->owner_uuid, owner_head->uuid, 16);
87ac110b7d6f58 Jianpeng Ma 2021-03-17  140  		recs->size = BCH_MAX_RECS;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  141  		recs->used = 0;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  142  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  143  		if (prev_recs)
87ac110b7d6f58 Jianpeng Ma 2021-03-17  144  			prev_recs->next = recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  145  		else
87ac110b7d6f58 Jianpeng Ma 2021-03-17  146  			owner_head->recs[ns_nr] = recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  147  	}
87ac110b7d6f58 Jianpeng Ma 2021-03-17  148  
87ac110b7d6f58 Jianpeng Ma 2021-03-17  149  	return recs;
87ac110b7d6f58 Jianpeng Ma 2021-03-17  150  }
87ac110b7d6f58 Jianpeng Ma 2021-03-17  151  

:::::: The code at line 138 was first introduced by commit
:::::: 87ac110b7d6f58c8e115e988253f132c995a8f50 bcache: bch_nvm_alloc_pages() of the buddy

:::::: TO: Jianpeng Ma <jianpeng.ma@intel.com>
:::::: CC: Coly Li <colyli@suse.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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