tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.12.y-rt-rebase head: ae0700ef2de03e51d49515f06447c1318a4f0843 commit: 9aaf36ff13a40708994eda539e935f4ee1be4442 [165/191] x86: Support for lazy preemption config: s390-randconfig-r005-20210312 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 7b153b43d3a14d76975039408c4b922beb576735) 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/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-5.12.y-rt-rebase git checkout 9aaf36ff13a40708994eda539e935f4ee1be4442 # 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 <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ 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: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:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ 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: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:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ 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: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:120:12: note: expanded from macro '__swab32' __fswab32(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: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); ~~~~~~~~~~ ^ 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:161:17: error: use of undeclared identifier '_TIF_NEED_RESCHED_MASK' if (ti_work & _TIF_NEED_RESCHED_MASK) ^ kernel/entry/common.c:215:25: 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 | \ ^ 20 warnings and 3 errors generated. vim +/_TIF_NEED_RESCHED_MASK +157 kernel/entry/common.c a9f3a74a29af09 Thomas Gleixner 2020-07-22 149 a9f3a74a29af09 Thomas Gleixner 2020-07-22 150 static unsigned long exit_to_user_mode_loop(struct pt_regs *regs, a9f3a74a29af09 Thomas Gleixner 2020-07-22 151 unsigned long ti_work) a9f3a74a29af09 Thomas Gleixner 2020-07-22 152 { a9f3a74a29af09 Thomas Gleixner 2020-07-22 153 /* a9f3a74a29af09 Thomas Gleixner 2020-07-22 154 * Before returning to user space ensure that all pending work a9f3a74a29af09 Thomas Gleixner 2020-07-22 155 * items have been completed. a9f3a74a29af09 Thomas Gleixner 2020-07-22 156 */ a9f3a74a29af09 Thomas Gleixner 2020-07-22 @157 while (ti_work & EXIT_TO_USER_MODE_WORK) { a9f3a74a29af09 Thomas Gleixner 2020-07-22 158 a9f3a74a29af09 Thomas Gleixner 2020-07-22 159 local_irq_enable_exit_to_user(ti_work); a9f3a74a29af09 Thomas Gleixner 2020-07-22 160 9aaf36ff13a407 Thomas Gleixner 2012-11-01 161 if (ti_work & _TIF_NEED_RESCHED_MASK) a9f3a74a29af09 Thomas Gleixner 2020-07-22 162 schedule(); a9f3a74a29af09 Thomas Gleixner 2020-07-22 163 :::::: The code at line 157 was first introduced by commit :::::: a9f3a74a29af095f3e1b89e9176f8127912ae0f0 entry: Provide generic syscall exit function :::::: TO: Thomas Gleixner <tglx(a)linutronix.de&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org