tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 625d3449788f85569096780592549d0340e9c0c7 commit: f566e1fbadb686e28f1c307e356114b2865ef588 kbuild: make multiple directory targets work date: 5 months ago config: openrisc-randconfig-s031-20200622 (attached as .config) compiler: or1k-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-dirty git checkout f566e1fbadb686e28f1c307e356114b2865ef588 # save the attached .config to linux build tree make W=1 C=1 ARCH=openrisc CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +/tcp_get_cookie_sock +94 include/asm-generic/qspinlock.h a33fda35e3a765 Waiman Long 2015-04-24 83 a33fda35e3a765 Waiman Long 2015-04-24 84 #ifndef queued_spin_unlock a33fda35e3a765 Waiman Long 2015-04-24 85 /** a33fda35e3a765 Waiman Long 2015-04-24 86 * queued_spin_unlock - release a queued spinlock a33fda35e3a765 Waiman Long 2015-04-24 87 * @lock : Pointer to queued spinlock structure a33fda35e3a765 Waiman Long 2015-04-24 88 */ a33fda35e3a765 Waiman Long 2015-04-24 89 static __always_inline void queued_spin_unlock(struct qspinlock *lock) a33fda35e3a765 Waiman Long 2015-04-24 90 { a33fda35e3a765 Waiman Long 2015-04-24 91 /* ca50e426f96c90 Pan Xinhui 2016-06-03 92 * unlock() needs release semantics: a33fda35e3a765 Waiman Long 2015-04-24 93 */ 626e5fbc143589 Will Deacon 2018-04-26 @94 smp_store_release(&lock->locked, 0); a33fda35e3a765 Waiman Long 2015-04-24 95 } a33fda35e3a765 Waiman Long 2015-04-24 96 #endif a33fda35e3a765 Waiman Long 2015-04-24 97 :::::: The code at line 94 was first introduced by commit :::::: 626e5fbc14358901ddaa90ce510e0fbeab310432 locking/qspinlock: Use smp_store_release() in queued_spin_unlock() :::::: TO: Will Deacon <will.deacon(a)arm.com&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org