[linux-next:master 6021/13159] arch/x86/include/asm/preempt.h:79:9: sparse: sparse: context imbalance in 'sock_map_seq_start' - wrong count at exit

[linux-next:master 6021/13159] arch/x86/include/asm/preempt.h:79:9: sparse: sparse: context imbalance in 'sock_map_seq_start' - wrong count at exit

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
TO: Lorenz Bauer <lmb@cloudflare.com>
CC: Alexei Starovoitov <ast@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   2172e358cd1713c5b7c31361ac465edfe55e455c
commit: 0365351524d7560d8ed7a42801a15252c6c56f41 [6021/13159] net: Allow iterating sockmap and sockhash
:::::: branch date: 7 hours ago
:::::: commit date: 3 weeks ago
config: x86_64-randconfig-s031-20201002 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-201-g24bdaac6-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=0365351524d7560d8ed7a42801a15252c6c56f41
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 0365351524d7560d8ed7a42801a15252c6c56f41
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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

	echo
	echo "sparse warnings: (new ones prefixed by >>)"
	echo
   net/core/sock_map.c: note: in included file (through include/linux/preempt.h, include/linux/spinlock.h, include/linux/debugobjects.h, ...):
>> arch/x86/include/asm/preempt.h:79:9: sparse: sparse: context imbalance in 'sock_map_seq_start' - wrong count at exit
   net/core/sock_map.c: note: in included file (through include/linux/workqueue.h, include/linux/bpf.h):
   include/linux/rcupdate.h:684:9: sparse: sparse: context imbalance in 'sock_map_seq_stop' - unexpected unlock
   net/core/sock_map.c: note: in included file (through include/linux/preempt.h, include/linux/spinlock.h, include/linux/debugobjects.h, ...):
>> arch/x86/include/asm/preempt.h:79:9: sparse: sparse: context imbalance in 'sock_hash_seq_start' - wrong count at exit
   net/core/sock_map.c: note: in included file (through include/linux/workqueue.h, include/linux/bpf.h):
   include/linux/rcupdate.h:684:9: sparse: sparse: context imbalance in 'sock_hash_seq_stop' - unexpected unlock

vim +/sock_map_seq_start +79 arch/x86/include/asm/preempt.h

c2daa3bed53a811 Peter Zijlstra    2013-08-14  72  
c2daa3bed53a811 Peter Zijlstra    2013-08-14  73  /*
c2daa3bed53a811 Peter Zijlstra    2013-08-14  74   * The various preempt_count add/sub methods
c2daa3bed53a811 Peter Zijlstra    2013-08-14  75   */
c2daa3bed53a811 Peter Zijlstra    2013-08-14  76  
c2daa3bed53a811 Peter Zijlstra    2013-08-14  77  static __always_inline void __preempt_count_add(int val)
c2daa3bed53a811 Peter Zijlstra    2013-08-14  78  {
b3ca1c10d7b32fd Christoph Lameter 2014-04-07 @79  	raw_cpu_add_4(__preempt_count, val);
c2daa3bed53a811 Peter Zijlstra    2013-08-14  80  }
c2daa3bed53a811 Peter Zijlstra    2013-08-14  81  

:::::: The code at line 79 was first introduced by commit
:::::: b3ca1c10d7b32fdfdfaf5484eda486323f52d9be percpu: add raw_cpu_ops

:::::: TO: Christoph Lameter <cl@linux.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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