[kbuild-all] Re: [PATCH] fs/proc: Expose RSEQ configuration

Hi Piotr, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on userns/for-next] [also build test WARNING on linus/master hnaz-linux-mm/master v5.11-rc3 next-20210113] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Piotr-Figiel/fs-proc-Expose-RSEQ... base: https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-next config: i386-randconfig-s002-20210113 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://github.com/0day-ci/linux/commit/ac6c42405fbb35bb266d602e4d9a303e6... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Piotr-Figiel/fs-proc-Expose-RSEQ-configuration/20210114-014431 git checkout ac6c42405fbb35bb266d602e4d9a303e68fadc21 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" fs/proc/base.c:674:41: sparse: sparse: cast removes address space '__user' of expression fs/proc/base.c:2248:25: sparse: sparse: cast to restricted fmode_t fs/proc/base.c:2305:42: sparse: sparse: cast from restricted fmode_t fs/proc/base.c:2402:48: sparse: sparse: cast from restricted fmode_t fs/proc/base.c: note: in included file (through include/linux/rcuwait.h, include/linux/percpu-rwsem.h, include/linux/fs.h, ...): include/linux/sched/signal.h:708:37: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ include/linux/sched/signal.h:708:37: sparse: expected struct spinlock [usertype] *lock include/linux/sched/signal.h:708:37: sparse: got struct spinlock [noderef] __rcu * fs/proc/base.c:1117:36: sparse: sparse: context imbalance in '__set_oom_adj' - unexpected unlock vim +674 fs/proc/base.c 665 666 #ifdef CONFIG_RSEQ 667 static int proc_pid_rseq(struct seq_file *m, struct pid_namespace *ns, 668 struct pid *pid, struct task_struct *task) 669 { 670 int res = lock_trace(task); 671 672 if (res) 673 return res; 675 unlock_trace(task); 676 return 0; 677 } 678 #endif /* CONFIG_RSEQ */ 679 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ 680 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org