tree: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git linux-4.19.y head: 4efb07eff34dc1494ad32a21fd61f0cd9febc3ff commit: 43d52193668b60acf22aae4029cc385096ad8e3c [284/663] fscrypt: move v1 policy key setup to keysetup_v1.c config: x86_64-randconfig-s022-20200823 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty git checkout 43d52193668b60acf22aae4029cc385096ad8e3c # 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(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) fs/crypto/keysetup_v1.c: note: in included file (through arch/x86/include/asm/qspinlock.h, arch/x86/include/asm/spinlock.h, include/linux/spinlock.h, ...): # https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git/c... git remote add f2fs-stable https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git git fetch --no-tags f2fs-stable linux-4.19.y git checkout 43d52193668b60acf22aae4029cc385096ad8e3c vim +/fscrypt_put_direct_key +101 include/asm-generic/qspinlock.h a33fda35e3a765 Waiman Long 2015-04-24 90 a33fda35e3a765 Waiman Long 2015-04-24 91 #ifndef queued_spin_unlock a33fda35e3a765 Waiman Long 2015-04-24 92 /** a33fda35e3a765 Waiman Long 2015-04-24 93 * queued_spin_unlock - release a queued spinlock a33fda35e3a765 Waiman Long 2015-04-24 94 * @lock : Pointer to queued spinlock structure a33fda35e3a765 Waiman Long 2015-04-24 95 */ a33fda35e3a765 Waiman Long 2015-04-24 96 static __always_inline void queued_spin_unlock(struct qspinlock *lock) a33fda35e3a765 Waiman Long 2015-04-24 97 { a33fda35e3a765 Waiman Long 2015-04-24 98 /* ca50e426f96c90 Pan Xinhui 2016-06-03 99 * unlock() needs release semantics: a33fda35e3a765 Waiman Long 2015-04-24 100 */ 626e5fbc143589 Will Deacon 2018-04-26 @101 smp_store_release(&lock->locked, 0); a33fda35e3a765 Waiman Long 2015-04-24 102 } a33fda35e3a765 Waiman Long 2015-04-24 103 #endif a33fda35e3a765 Waiman Long 2015-04-24 104 :::::: The code at line 101 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