tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.tmp head: 5965a7adbd72dd9b288c0911cb73719fed1efa08 commit: 18970ac4e37011fd0c709b6c2a640f01eecf2dd7 [15/21] locking/rtmutex: Remove pointless CONFIG_RT_MUTEXES=n stubs config: s390-randconfig-r034-20210324 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a4fb88669cd98db6fef7dcac88e3ec425d40c00d) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=18970ac4e37011fd0c709b6c2a640f01eecf2dd7 git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip tmp.tmp git checkout 18970ac4e37011fd0c709b6c2a640f01eecf2dd7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): In file included from kernel/rcu/tree.c:48: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from kernel/rcu/tree.c:48: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from kernel/rcu/tree.c:48: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:35: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:49:33: note: expanded from macro 'READ_ONCE' compiletime_assert_rwonce_type(x); \ ^ include/asm-generic/rwonce.h:36:48: note: expanded from macro 'compiletime_assert_rwonce_type' compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \ ^ include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:65: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ include/linux/compiler_types.h:271:13: note: expanded from macro '__unqual_scalar_typeof' _Generic((x), \ ^ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:65: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ include/linux/compiler_types.h:278:15: note: expanded from macro '__unqual_scalar_typeof' default: (x))) ^ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:28: error: no member named 'pi_waiters' in 'struct task_struct' return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ~ ^ include/linux/rbtree.h:40:42: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ^~~~ include/asm-generic/rwonce.h:50:14: note: expanded from macro 'READ_ONCE' __READ_ONCE(x); \ ^ include/asm-generic/rwonce.h:44:72: note: expanded from macro '__READ_ONCE' #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x)) ^ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: >> kernel/rcu/../locking/rtmutex_common.h:58:10: error: invalid operands to binary expression ('void' and 'void *') return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/rbtree.h:40:58: note: expanded from macro 'RB_EMPTY_ROOT' #define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL) ~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: kernel/rcu/../locking/rtmutex_common.h:63:21: error: no member named 'pi_waiters' in 'struct task_struct' return rb_entry(p->pi_waiters.rb_leftmost, struct rt_mutex_waiter, ~ ^ include/linux/rbtree.h:38:50: note: expanded from macro 'rb_entry' #define rb_entry(ptr, type, member) container_of(ptr, type, member) ^~~ include/linux/kernel.h:708:26: note: expanded from macro 'container_of' void *__mptr = (void *)(ptr); \ ^~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: kernel/rcu/../locking/rtmutex_common.h:63:21: error: no member named 'pi_waiters' in 'struct task_struct' return rb_entry(p->pi_waiters.rb_leftmost, struct rt_mutex_waiter, ~ ^ include/linux/rbtree.h:38:50: note: expanded from macro 'rb_entry' #define rb_entry(ptr, type, member) container_of(ptr, type, member) ^~~ include/linux/kernel.h:709:34: note: expanded from macro 'container_of' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^~~ include/linux/compiler_types.h:256:63: note: expanded from macro '__same_type' #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ In file included from kernel/rcu/tree.c:4671: In file included from kernel/rcu/tree_plugin.h:14: kernel/rcu/../locking/rtmutex_common.h:63:21: error: no member named 'pi_waiters' in 'struct task_struct' return rb_entry(p->pi_waiters.rb_leftmost, struct rt_mutex_waiter, ~ ^ include/linux/rbtree.h:38:50: note: expanded from macro 'rb_entry' #define rb_entry(ptr, type, member) container_of(ptr, type, member) ^~~ include/linux/kernel.h:710:20: note: expanded from macro 'container_of' !__same_type(*(ptr), void), \ ^~~ include/linux/compiler_types.h:256:63: note: expanded from macro '__same_type' #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/compiler_types.h:320:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~ include/linux/compiler_types.h:308:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler_types.h:300:9: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^~~~~~~~~ 12 warnings and 12 errors generated. vim +58 kernel/rcu/../locking/rtmutex_common.h 23f78d4a03c53c kernel/rtmutex_common.h Ingo Molnar 2006-06-27 55 23f78d4a03c53c kernel/rtmutex_common.h Ingo Molnar 2006-06-27 56 static inline int task_has_pi_waiters(struct task_struct *p) 23f78d4a03c53c kernel/rtmutex_common.h Ingo Molnar 2006-06-27 57 { a23ba907d5e65d kernel/locking/rtmutex_common.h Davidlohr Bueso 2017-09-08 @58 return !RB_EMPTY_ROOT(&p->pi_waiters.rb_root); 23f78d4a03c53c kernel/rtmutex_common.h Ingo Molnar 2006-06-27 59 } 23f78d4a03c53c kernel/rtmutex_common.h Ingo Molnar 2006-06-27 60 :::::: The code at line 58 was first introduced by commit :::::: a23ba907d5e65d6aeea3e59c82fda9cd206a7aad locking/rtmutex: replace top-waiter and pi_waiters leftmost caching :::::: TO: Davidlohr Bueso :::::: CC: Linus Torvalds --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org