3:25 a.m.
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>
sparse warnings: (new ones prefixed by >>)
> drivers/gpu/drm/drm_lock.c:75:24: sparse: sparse: incorrect type
in argument 1 (different modifiers) @@ expected void *ptr @@ got unsigned int
volatile *__ai_ptr @@
drivers/gpu/drm/drm_lock.c: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>
:::::: CC: Daniel Vetter <daniel.vetter(a)ffwll.ch>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org