tree: https://github.com/weiny2/linux-kernel.git tip-pks-v4.4-5.12-rc head: 399765b19fddc5de52906b804070a156c7617798 commit: f6415574e4346a0c71c33ff2de85f851c94d1b27 [12/16] kmap: Add stray access protection for device pages config: powerpc64-randconfig-r002-20210309 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project cd9a69289c7825d54450cb6829fef2c8e0f1963a) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/weiny2/linux-kernel/commit/f6415574e4346a0c71c33ff2de8... git remote add weiny2 https://github.com/weiny2/linux-kernel.git git fetch --no-tags weiny2 tip-pks-v4.4-5.12-rc git checkout f6415574e4346a0c71c33ff2de85f851c94d1b27 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): In file included from arch/powerpc/kernel/asm-offsets.c:21: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ 1 warning generated. -- In file included from arch/powerpc/kernel/syscalls.c:27: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ 1 error generated. -- In file included from arch/powerpc/kernel/sys_ppc32.c:28: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ arch/powerpc/kernel/sys_ppc32.c:51:15: error: no previous prototype for function 'compat_sys_mmap2' [-Werror,-Wmissing-prototypes] unsigned long compat_sys_mmap2(unsigned long addr, size_t len, ^ arch/powerpc/kernel/sys_ppc32.c:51:1: note: declare 'static' if the function is not intended to be used outside of this translation unit unsigned long compat_sys_mmap2(unsigned long addr, size_t len, ^ static arch/powerpc/kernel/sys_ppc32.c:71:16: error: no previous prototype for function 'compat_sys_pread64' [-Werror,-Wmissing-prototypes] compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count, ^ arch/powerpc/kernel/sys_ppc32.c:71:1: note: declare 'static' if the function is not intended to be used outside of this translation unit compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count, ^ static arch/powerpc/kernel/sys_ppc32.c:77:16: error: no previous prototype for function 'compat_sys_pwrite64' [-Werror,-Wmissing-prototypes] compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count, ^ arch/powerpc/kernel/sys_ppc32.c:77:1: note: declare 'static' if the function is not intended to be used outside of this translation unit compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count, ^ static arch/powerpc/kernel/sys_ppc32.c:83:16: error: no previous prototype for function 'compat_sys_readahead' [-Werror,-Wmissing-prototypes] compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count) ^ arch/powerpc/kernel/sys_ppc32.c:83:1: note: declare 'static' if the function is not intended to be used outside of this translation unit compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count) ^ static arch/powerpc/kernel/sys_ppc32.c:88:16: error: no previous prototype for function 'compat_sys_truncate64' [-Werror,-Wmissing-prototypes] asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4, ^ arch/powerpc/kernel/sys_ppc32.c:88:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4, ^ static arch/powerpc/kernel/sys_ppc32.c:94:17: error: no previous prototype for function 'compat_sys_fallocate' [-Werror,-Wmissing-prototypes] asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2, ^ arch/powerpc/kernel/sys_ppc32.c:94:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2, ^ static arch/powerpc/kernel/sys_ppc32.c:101:16: error: no previous prototype for function 'compat_sys_ftruncate64' [-Werror,-Wmissing-prototypes] asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1, ^ arch/powerpc/kernel/sys_ppc32.c:101:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1, ^ static arch/powerpc/kernel/sys_ppc32.c:107:6: error: no previous prototype for function 'ppc32_fadvise64' [-Werror,-Wmissing-prototypes] long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2, ^ arch/powerpc/kernel/sys_ppc32.c:107:1: note: declare 'static' if the function is not intended to be used outside of this translation unit long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2, ^ static arch/powerpc/kernel/sys_ppc32.c:114:17: error: no previous prototype for function 'compat_sys_sync_file_range2' [-Werror,-Wmissing-prototypes] asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags, ^ arch/powerpc/kernel/sys_ppc32.c:114:12: note: declare 'static' if the function is not intended to be used outside of this translation unit asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags, ^ static 10 errors generated. -- In file included from kernel/fork.c:41: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ kernel/fork.c:161:13: warning: no previous prototype for function 'arch_release_task_struct' [-Wmissing-prototypes] void __weak arch_release_task_struct(struct task_struct *tsk) ^ kernel/fork.c:161:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __weak arch_release_task_struct(struct task_struct *tsk) ^ static kernel/fork.c:746:20: warning: no previous prototype for function 'arch_task_cache_init' [-Wmissing-prototypes] void __init __weak arch_task_cache_init(void) { } ^ kernel/fork.c:746:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __init __weak arch_task_cache_init(void) { } ^ static 3 warnings generated. -- In file included from kernel/events/core.c:43: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ kernel/events/core.c:6524:6: warning: no previous prototype for function 'perf_pmu_snapshot_aux' [-Wmissing-prototypes] long perf_pmu_snapshot_aux(struct perf_buffer *rb, ^ kernel/events/core.c:6524:1: note: declare 'static' if the function is not intended to be used outside of this translation unit long perf_pmu_snapshot_aux(struct perf_buffer *rb, ^ static 2 warnings generated. -- In file included from arch/powerpc/kernel/asm-offsets.c:21: In file included from include/linux/mman.h:9: In file included from include/uapi/linux/mman.h:5: In file included from arch/powerpc/include/asm/mman.h:7: In file included from arch/powerpc/include/uapi/asm/mman.h:11: #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ ^ arch/powerpc/include/asm/pkeys.h:22:9: note: previous definition is here #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \ ^ 1 warning generated. vim +/PKEY_ACCESS_MASK +80 include/uapi/asm-generic/mman-common.h 5f6164f3092832 include/asm-generic/mman.h Michael S. Tsirkin 2006-02-15 77 e8c24d3a23a469 include/uapi/asm-generic/mman-common.h Dave Hansen 2016-07-29 78 #define PKEY_DISABLE_ACCESS 0x1 e8c24d3a23a469 include/uapi/asm-generic/mman-common.h Dave Hansen 2016-07-29 79 #define PKEY_DISABLE_WRITE 0x2 e8c24d3a23a469 include/uapi/asm-generic/mman-common.h Dave Hansen 2016-07-29 @80 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ e8c24d3a23a469 include/uapi/asm-generic/mman-common.h Dave Hansen 2016-07-29 81 PKEY_DISABLE_WRITE) e8c24d3a23a469 include/uapi/asm-generic/mman-common.h Dave Hansen 2016-07-29 82 :::::: The code at line 80 was first introduced by commit :::::: e8c24d3a23a469f1f40d4de24d872ca7023ced0a x86/pkeys: Allocation/free syscalls :::::: TO: Dave Hansen <dave.hansen(a)linux.intel.com&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