tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.9.y-rt-rebase head: ae29d238360226f2ec8d2531d96e64dc6901bf54 commit: b02dafecf64ca01e271279e17a0f25592c74dafa [99/233] locking/rtmutex: add ww_mutex addon for mutex-rt config: x86_64-randconfig-a004-20201005 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5fbab4025eb57b12f2842ab188ff07a110708e1d) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.9.y-rt-rebase git checkout b02dafecf64ca01e271279e17a0f25592c74dafa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-rt-devel/linux-5.9.y-rt-rebase HEAD ae29d238360226f2ec8d2531d96e64dc6901bf54 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from arch/x86/kernel/asm-offsets.c:9: In file included from include/linux/crypto.h:20: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:6: In file included from include/linux/mmzone.h:16: SEQCOUNT_LOCKTYPE(struct ww_mutex, ww_mutex, true, &s->lock->base) ~~~~~~~^ include/linux/seqlock.h:192:33: note: expanded from macro 'SEQCOUNT_LOCKTYPE' __SEQ_LOCK(lockdep_assert_held(lockmember)); \ ^~~~~~~~~~ include/linux/lockdep.h:294:43: note: expanded from macro 'lockdep_assert_held' WARN_ON(debug_locks && !lockdep_is_held(l)); \ ^ include/linux/lockdep.h:270:47: note: expanded from macro 'lockdep_is_held' #define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map) ^~~~ include/asm-generic/bug.h:119:25: note: expanded from macro 'WARN_ON' int __ret_warn_on = !!(condition); \ ^~~~~~~~~ include/linux/seqlock.h:135:26: note: expanded from macro '__SEQ_LOCK' #define __SEQ_LOCK(expr) expr ^~~~ include/linux/seqlock.h:218:26: note: forward declaration of 'struct ww_mutex' SEQCOUNT_LOCKTYPE(struct ww_mutex, ww_mutex, true, &s->lock->base) ^ 1 error generated. make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1198: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:185: __sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +218 include/linux/seqlock.h 55f3560df975f55 Ahmed S. Darwish 2020-07-20 213 a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 214 SEQCOUNT_LOCKTYPE(raw_spinlock_t, raw_spinlock, false, s->lock) a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 215 SEQCOUNT_LOCKTYPE(spinlock_t, spinlock, false, s->lock) a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 216 SEQCOUNT_LOCKTYPE(rwlock_t, rwlock, false, s->lock) a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 217 SEQCOUNT_LOCKTYPE(struct mutex, mutex, true, s->lock) a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 @218 SEQCOUNT_LOCKTYPE(struct ww_mutex, ww_mutex, true, &s->lock->base) a8772dccb2ec7b1 Peter Zijlstra 2020-07-23 219 :::::: The code at line 218 was first introduced by commit :::::: a8772dccb2ec7b139db1b3ba782ecb12ed92d7c3 seqlock: Fold seqcount_LOCKNAME_t definition :::::: TO: Peter Zijlstra <peterz(a)infradead.org&gt; :::::: CC: Peter Zijlstra <peterz(a)infradead.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org