Messages in this thread | | | Date | Sun, 10 Oct 2021 19:08:09 +0800 | From | kernel test robot <> | Subject | [tip:locking/core 19/39] kernel/futex/syscalls.c:82:16: sparse: sparse: cast removes address space '__user' of expression |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core head: dd0aa2cd2e9e3e49b8c3b43924dc1a1d4e22b4d1 commit: af8cc9600bbf2251b04c56139f7c83f87c3f878a [19/39] futex: Split out syscalls config: riscv-randconfig-s031-20211010 (attached as .config) compiler: riscv32-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=af8cc9600bbf2251b04c56139f7c83f87c3f878a git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip locking/core git checkout af8cc9600bbf2251b04c56139f7c83f87c3f878a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>) >> kernel/futex/syscalls.c:82:16: sparse: sparse: cast removes address space '__user' of expression
vim +/__user +82 kernel/futex/syscalls.c
44 45 /** 46 * sys_get_robust_list() - Get the robust-futex list head of a task 47 * @pid: pid of the process [zero for current task] 48 * @head_ptr: pointer to a list-head pointer, the kernel fills it in 49 * @len_ptr: pointer to a length field, the kernel fills in the header size 50 */ 51 SYSCALL_DEFINE3(get_robust_list, int, pid, 52 struct robust_list_head __user * __user *, head_ptr, 53 size_t __user *, len_ptr) 54 { 55 struct robust_list_head __user *head; 56 unsigned long ret; 57 struct task_struct *p; 58 59 if (!futex_cmpxchg_enabled) 60 return -ENOSYS; 61 62 rcu_read_lock(); 63 64 ret = -ESRCH; 65 if (!pid) 66 p = current; 67 else { 68 p = find_task_by_vpid(pid); 69 if (!p) 70 goto err_unlock; 71 } 72 73 ret = -EPERM; 74 if (!ptrace_may_access(p, PTRACE_MODE_READ_REALCREDS)) 75 goto err_unlock; 76 77 head = p->robust_list; 78 rcu_read_unlock(); 79 80 if (put_user(sizeof(*head), len_ptr)) 81 return -EFAULT; > 82 return put_user(head, head_ptr); 83 84 err_unlock: 85 rcu_read_unlock(); 86 87 return ret; 88 } 89
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