tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/stacktrace
head:   63c35ea6b829a0f98d307a8dec038095681ecd13
commit: c79cc35c00e9f15a9a32a08569036cb8365c8816 [24/47] mm/slab: Simplify stack trace handling
config: x86_64-randconfig-x003-201915 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout c79cc35c00e9f15a9a32a08569036cb8365c8816
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   mm/slab.c: In function 'store_stackinfo':
>> mm/slab.c:1490:11: error: 'trace' undeclared (first use in this function); did you mean 'true'?
      addr += trace.nr_entries;
              ^~~~~
              true
   mm/slab.c:1490:11: note: each undeclared identifier is reported only once for each function it appears in

vim +1490 mm/slab.c

^1da177e Linus Torvalds  2005-04-16  1468  
^1da177e Linus Torvalds  2005-04-16  1469  #ifdef CONFIG_DEBUG_PAGEALLOC
343e0d7a Pekka Enberg    2006-02-01  1470  static void store_stackinfo(struct kmem_cache *cachep, unsigned long *addr,
^1da177e Linus Torvalds  2005-04-16  1471  			    unsigned long caller)
^1da177e Linus Torvalds  2005-04-16  1472  {
b8623975 Thomas Gleixner 2019-04-08  1473  	int size = cachep->object_size / sizeof(unsigned long);
^1da177e Linus Torvalds  2005-04-16  1474  
3dafccf2 Manfred Spraul  2006-02-01  1475  	addr = (unsigned long *)&((char *)addr)[obj_offset(cachep)];
^1da177e Linus Torvalds  2005-04-16  1476  
b8623975 Thomas Gleixner 2019-04-08  1477  	if (size < 5)
^1da177e Linus Torvalds  2005-04-16  1478  		return;
^1da177e Linus Torvalds  2005-04-16  1479  
^1da177e Linus Torvalds  2005-04-16  1480  	*addr++ = 0x12345678;
^1da177e Linus Torvalds  2005-04-16  1481  	*addr++ = caller;
^1da177e Linus Torvalds  2005-04-16  1482  	*addr++ = smp_processor_id();
b8623975 Thomas Gleixner 2019-04-08  1483  	size -= 3;
b8623975 Thomas Gleixner 2019-04-08  1484  #ifdef CONFIG_STACKTRACE
^1da177e Linus Torvalds  2005-04-16  1485  	{
c79cc35c Thomas Gleixner 2019-04-14  1486  		unsigned int nr_entries;
^1da177e Linus Torvalds  2005-04-16  1487  
c79cc35c Thomas Gleixner 2019-04-14  1488  		/* Leave one for the end marker below */
c79cc35c Thomas Gleixner 2019-04-14  1489  		nr_entries = stack_trace_save(addr, size - 1, 3);
b8623975 Thomas Gleixner 2019-04-08 @1490  		addr += trace.nr_entries;
^1da177e Linus Torvalds  2005-04-16  1491  	}
b8623975 Thomas Gleixner 2019-04-08  1492  #endif
b8623975 Thomas Gleixner 2019-04-08  1493  	*addr = 0x87654321;
^1da177e Linus Torvalds  2005-04-16  1494  }
40b44137 Joonsoo Kim     2016-03-15  1495  

:::::: The code at line 1490 was first introduced by commit
:::::: b86239751f8c4d6fc43f6a9eca29e77b0319f5d7 mm/slab: Fix broken stack trace storage

:::::: TO: Thomas Gleixner <tglx@linutronix.de>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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