tree: https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features head: 9d42a4d3e27db3cabad82483ed876d4c8b8bed65 commit: 000174233b91340ca52a9eca905d029a9a2aefd9 [40/44] s390/atomic,cmpxchg: switch to use atomic-instrumented.h config: s390-randconfig-s032-20210412 (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-280-g2cd6d34e-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?id... git remote add s390 https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git git fetch --no-tags s390 features git checkout 000174233b91340ca52a9eca905d029a9a2aefd9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=s390 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 >>) drivers/gpu/drm/drm_lock.c:75:24: sparse: expected void *ptr drivers/gpu/drm/drm_lock.c:75:24: sparse: got unsigned int volatile *__ai_ptr drivers/gpu/drm/drm_lock.c:118:24: sparse: sparse: incorrect type in argument 1 (different modifiers) @@ expected void *ptr @@ got unsigned int volatile *__ai_ptr @@ drivers/gpu/drm/drm_lock.c:118:24: sparse: expected void *ptr drivers/gpu/drm/drm_lock.c:118:24: sparse: got unsigned int volatile *__ai_ptr drivers/gpu/drm/drm_lock.c:141:24: sparse: sparse: incorrect type in argument 1 (different modifiers) @@ expected void *ptr @@ got unsigned int volatile *__ai_ptr @@ drivers/gpu/drm/drm_lock.c:141:24: sparse: expected void *ptr drivers/gpu/drm/drm_lock.c:141:24: sparse: got unsigned int volatile *__ai_ptr drivers/gpu/drm/drm_lock.c:319:40: sparse: sparse: incorrect type in argument 1 (different modifiers) @@ expected void *ptr @@ got unsigned int volatile *__ai_ptr @@ drivers/gpu/drm/drm_lock.c:319:40: sparse: expected void *ptr drivers/gpu/drm/drm_lock.c:319:40: sparse: got unsigned int volatile *__ai_ptr vim +75 drivers/gpu/drm/drm_lock.c 4ac5ec40ec7002 Daniel Vetter 2010-08-23 48 bd50d4a2168370 Benjamin Gaignard 2020-03-06 49 /* 1a75a222f5ca10 Daniel Vetter 2016-06-14 50 * Take the heavyweight lock. 1a75a222f5ca10 Daniel Vetter 2016-06-14 51 * 1a75a222f5ca10 Daniel Vetter 2016-06-14 52 * \param lock lock pointer. 1a75a222f5ca10 Daniel Vetter 2016-06-14 53 * \param context locking context. 1a75a222f5ca10 Daniel Vetter 2016-06-14 54 * \return one if the lock is held, or zero otherwise. 1a75a222f5ca10 Daniel Vetter 2016-06-14 55 * 1a75a222f5ca10 Daniel Vetter 2016-06-14 56 * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction. 1a75a222f5ca10 Daniel Vetter 2016-06-14 57 */ 1a75a222f5ca10 Daniel Vetter 2016-06-14 58 static 1a75a222f5ca10 Daniel Vetter 2016-06-14 59 int drm_lock_take(struct drm_lock_data *lock_data, 1a75a222f5ca10 Daniel Vetter 2016-06-14 60 unsigned int context) 1a75a222f5ca10 Daniel Vetter 2016-06-14 61 { 1a75a222f5ca10 Daniel Vetter 2016-06-14 62 unsigned int old, new, prev; 1a75a222f5ca10 Daniel Vetter 2016-06-14 63 volatile unsigned int *lock = &lock_data->hw_lock->lock; 1a75a222f5ca10 Daniel Vetter 2016-06-14 64 1a75a222f5ca10 Daniel Vetter 2016-06-14 65 spin_lock_bh(&lock_data->spinlock); 1a75a222f5ca10 Daniel Vetter 2016-06-14 66 do { 1a75a222f5ca10 Daniel Vetter 2016-06-14 67 old = *lock; 1a75a222f5ca10 Daniel Vetter 2016-06-14 68 if (old & _DRM_LOCK_HELD) 1a75a222f5ca10 Daniel Vetter 2016-06-14 69 new = old | _DRM_LOCK_CONT; 1a75a222f5ca10 Daniel Vetter 2016-06-14 70 else { 1a75a222f5ca10 Daniel Vetter 2016-06-14 71 new = context | _DRM_LOCK_HELD | 1a75a222f5ca10 Daniel Vetter 2016-06-14 72 ((lock_data->user_waiters + lock_data->kernel_waiters > 1) ? 1a75a222f5ca10 Daniel Vetter 2016-06-14 73 _DRM_LOCK_CONT : 0); 1a75a222f5ca10 Daniel Vetter 2016-06-14 74 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 @75 prev = cmpxchg(lock, old, new); 1a75a222f5ca10 Daniel Vetter 2016-06-14 76 } while (prev != old); 1a75a222f5ca10 Daniel Vetter 2016-06-14 77 spin_unlock_bh(&lock_data->spinlock); 1a75a222f5ca10 Daniel Vetter 2016-06-14 78 1a75a222f5ca10 Daniel Vetter 2016-06-14 79 if (_DRM_LOCKING_CONTEXT(old) == context) { 1a75a222f5ca10 Daniel Vetter 2016-06-14 80 if (old & _DRM_LOCK_HELD) { 1a75a222f5ca10 Daniel Vetter 2016-06-14 81 if (context != DRM_KERNEL_CONTEXT) { 1a75a222f5ca10 Daniel Vetter 2016-06-14 82 DRM_ERROR("%d holds heavyweight lock\n", 1a75a222f5ca10 Daniel Vetter 2016-06-14 83 context); 1a75a222f5ca10 Daniel Vetter 2016-06-14 84 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 85 return 0; 1a75a222f5ca10 Daniel Vetter 2016-06-14 86 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 87 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 88 1a75a222f5ca10 Daniel Vetter 2016-06-14 89 if ((_DRM_LOCKING_CONTEXT(new)) == context && (new & _DRM_LOCK_HELD)) { 1a75a222f5ca10 Daniel Vetter 2016-06-14 90 /* Have lock */ 1a75a222f5ca10 Daniel Vetter 2016-06-14 91 return 1; 1a75a222f5ca10 Daniel Vetter 2016-06-14 92 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 93 return 0; 1a75a222f5ca10 Daniel Vetter 2016-06-14 94 } 1a75a222f5ca10 Daniel Vetter 2016-06-14 95 :::::: The code at line 75 was first introduced by commit :::::: 1a75a222f5ca1063249b5c92972d32dcc3c8966e drm: Hide hw.lock cleanup in filp->release better :::::: TO: Daniel Vetter <daniel.vetter(a)ffwll.ch&gt; :::::: CC: Daniel Vetter <daniel.vetter(a)ffwll.ch&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org