Messages in this thread | | | Date | Fri, 26 Nov 2021 02:22:46 +0800 | From | kernel test robot <> | Subject | kernel/futex/syscalls.c:29:1: sparse: sparse: Using plain integer as NULL pointer |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5f53fa508db098c9d372423a6dac31c8a5679cdf commit: af8cc9600bbf2251b04c56139f7c83f87c3f878a futex: Split out syscalls date: 7 weeks ago config: s390-randconfig-s031-20211116 (https://download.01.org/0day-ci/archive/20211126/202111260248.R4wPhIDu-lkp@intel.com/config) compiler: s390-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/torvalds/linux.git/commit/?id=af8cc9600bbf2251b04c56139f7c83f87c3f878a git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout af8cc9600bbf2251b04c56139f7c83f87c3f878a # save the config file 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=s390 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:29:1: sparse: sparse: Using plain integer as NULL pointer >> kernel/futex/syscalls.c:29:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:51:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:51:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:51:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:51:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:180:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:203:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:203:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:218:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:218:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:218:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:218:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer kernel/futex/syscalls.c:259:1: sparse: sparse: Using plain integer as NULL pointer
vim +29 kernel/futex/syscalls.c
8 9 /* 10 * Support for robust futexes: the kernel cleans up held futexes at 11 * thread exit time. 12 * 13 * Implementation: user-space maintains a per-thread list of locks it 14 * is holding. Upon do_exit(), the kernel carefully walks this list, 15 * and marks all locks that are owned by this thread with the 16 * FUTEX_OWNER_DIED bit, and wakes up a waiter (if any). The list is 17 * always manipulated with the lock held, so the list is private and 18 * per-thread. Userspace also maintains a per-thread 'list_op_pending' 19 * field, to allow the kernel to clean up if the thread dies after 20 * acquiring the lock, but just before it could have added itself to 21 * the list. There can only be one such pending lock. 22 */ 23 24 /** 25 * sys_set_robust_list() - Set the robust-futex list head of a task 26 * @head: pointer to the list-head 27 * @len: length of the list-head, as userspace expects 28 */ > 29 SYSCALL_DEFINE2(set_robust_list, struct robust_list_head __user *, head, 30 size_t, len) 31 { 32 if (!futex_cmpxchg_enabled) 33 return -ENOSYS; 34 /* 35 * The kernel knows only one size for now: 36 */ 37 if (unlikely(len != sizeof(*head))) 38 return -EINVAL; 39 40 current->robust_list = head; 41 42 return 0; 43 } 44
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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