[rcu:dev 211/211] kernel/rcu/rcutorture.c:212:5: sparse: symbol 'err_segs_recorded' was not declared. Should it be static?

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
head:   07809ecaa895e92b00c28e8c0b7442bddb8a9324
commit: 07809ecaa895e92b00c28e8c0b7442bddb8a9324 [211/211] rcutorture: Dump reader protection sequence if failures or close calls
reproduce:
        # apt-get install sparse
        git checkout 07809ecaa895e92b00c28e8c0b7442bddb8a9324
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> kernel/rcu/rcutorture.c:212:5: sparse: symbol 'err_segs_recorded' was not declared. Should it be static?
>> kernel/rcu/rcutorture.c:213:20: sparse: symbol 'err_segs' was not declared. Should it be static?
>> kernel/rcu/rcutorture.c:214:5: sparse: symbol 'rt_read_nsegs' was not declared. Should it be static?
   include/linux/overflow.h:242:13: sparse: undefined identifier '__builtin_mul_overflow'
   include/linux/overflow.h:242:13: sparse: incorrect type in conditional
   include/linux/overflow.h:242:13:    got void
   include/linux/overflow.h:244:13: sparse: undefined identifier '__builtin_mul_overflow'
   include/linux/overflow.h:244:13: sparse: incorrect type in conditional
   include/linux/overflow.h:244:13:    got void
   include/linux/slab.h:631:13: sparse: undefined identifier '__builtin_mul_overflow'
   include/linux/slab.h:631:13: sparse: not a function <noident>
   include/linux/slab.h:631:13: sparse: not a function <noident>
   include/linux/slab.h:631:13: sparse: not a function <noident>
   include/linux/slab.h:631:13: sparse: not a function <noident>
   include/linux/overflow.h:242:13: sparse: call with no type!
   include/linux/overflow.h:244:13: sparse: call with no type!
   kernel/rcu/rcutorture.c:1183:9: sparse: context imbalance in 'rcutorture_one_extend' - different lock contexts for basic block
   include/linux/slab.h:631:13: sparse: call with no type!

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation