tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.13.y-rt-testing head: 87ca00748cfcc19b46d4622228d2e0e8514d5033 commit: f2f9e496208c584356e84e720a3dfd99970ee5e9 [207/228] x86: Support for lazy preemption config: s390-buildonly-randconfig-r005-20210712 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe) 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/rt/linux-rt-devel.git/commit/?id=f2f9e496208c584356e84e720a3dfd99970ee5e9 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-5.13.y-rt-testing git checkout f2f9e496208c584356e84e720a3dfd99970ee5e9 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=s390 SHELL=/bin/bash kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot Note: the linux-rt-devel/linux-5.13.y-rt-testing HEAD 87ca00748cfcc19b46d4622228d2e0e8514d5033 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from kernel/entry/common.c:4: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: 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:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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/entry/common.c:4: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: 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:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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/entry/common.c:4: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: 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:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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); ~~~~~~~~~~ ^ >> kernel/entry/common.c:158:19: error: use of undeclared identifier '_TIF_NEED_RESCHED_MASK' while (ti_work & EXIT_TO_USER_MODE_WORK) { ^ include/linux/entry-common.h:62:3: note: expanded from macro 'EXIT_TO_USER_MODE_WORK' _TIF_NEED_RESCHED_MASK | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL | \ ^ kernel/entry/common.c:162:17: error: use of undeclared identifier '_TIF_NEED_RESCHED_MASK' if (ti_work & _TIF_NEED_RESCHED_MASK) ^ kernel/entry/common.c:216:25: error: use of undeclared identifier '_TIF_NEED_RESCHED_MASK' if (unlikely(ti_work & EXIT_TO_USER_MODE_WORK)) ^ include/linux/entry-common.h:62:3: note: expanded from macro 'EXIT_TO_USER_MODE_WORK' _TIF_NEED_RESCHED_MASK | _TIF_PATCH_PENDING | _TIF_NOTIFY_SIGNAL | \ ^ 12 warnings and 3 errors generated. vim +/_TIF_NEED_RESCHED_MASK +158 kernel/entry/common.c a9f3a74a29af09 Thomas Gleixner 2020-07-22 150 a9f3a74a29af09 Thomas Gleixner 2020-07-22 151 static unsigned long exit_to_user_mode_loop(struct pt_regs *regs, a9f3a74a29af09 Thomas Gleixner 2020-07-22 152 unsigned long ti_work) a9f3a74a29af09 Thomas Gleixner 2020-07-22 153 { a9f3a74a29af09 Thomas Gleixner 2020-07-22 154 /* a9f3a74a29af09 Thomas Gleixner 2020-07-22 155 * Before returning to user space ensure that all pending work a9f3a74a29af09 Thomas Gleixner 2020-07-22 156 * items have been completed. a9f3a74a29af09 Thomas Gleixner 2020-07-22 157 */ a9f3a74a29af09 Thomas Gleixner 2020-07-22 @158 while (ti_work & EXIT_TO_USER_MODE_WORK) { a9f3a74a29af09 Thomas Gleixner 2020-07-22 159 a9f3a74a29af09 Thomas Gleixner 2020-07-22 160 local_irq_enable_exit_to_user(ti_work); a9f3a74a29af09 Thomas Gleixner 2020-07-22 161 f2f9e496208c58 Thomas Gleixner 2012-11-01 162 if (ti_work & _TIF_NEED_RESCHED_MASK) a9f3a74a29af09 Thomas Gleixner 2020-07-22 163 schedule(); a9f3a74a29af09 Thomas Gleixner 2020-07-22 164 :::::: The code at line 158 was first introduced by commit :::::: a9f3a74a29af095f3e1b89e9176f8127912ae0f0 entry: Provide generic syscall exit function :::::: TO: Thomas Gleixner :::::: CC: Thomas Gleixner --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org