linux-kernel - kernel/trace/trace_events_user.c:811:13: sparse: sparse: cast removes address space '_

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Date:   Sat, 16 Jul 2022 05:25:10 +0800
From:   kernel test robot <lkp@...el.com>
To:     Beau Belgrave <beaub@...ux.microsoft.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>
Subject: kernel/trace/trace_events_user.c:811:13: sparse: sparse: cast
 removes address space '__user' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9b59ec8d50a1f28747ceff9a4f39af5deba9540e
commit: 7f5a08c79df35e68f1a43033450c5050f12bc155 user_events: Add minimal support for trace_event into ftrace
date:   5 months ago
config: sparc64-randconfig-s031-20220716 (https://download.01.org/0day-ci/archive/20220716/202207160536.yQsO3FQC-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f5a08c79df35e68f1a43033450c5050f12bc155
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7f5a08c79df35e68f1a43033450c5050f12bc155
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/usb/gadget/function/ drivers/virtio/ kernel/trace/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
   kernel/trace/trace_events_user.c:747:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:747:16: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:747:16: sparse:    void *
>> kernel/trace/trace_events_user.c:811:13: sparse: sparse: cast removes address space '__user' of expression
>> kernel/trace/trace_events_user.c:811:13: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void [noderef] __user *buf @@     got char * @@
   kernel/trace/trace_events_user.c:811:13: sparse:     expected void [noderef] __user *buf
   kernel/trace/trace_events_user.c:811:13: sparse:     got char *
   kernel/trace/trace_events_user.c:827:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:827:16: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:827:16: sparse:    void *
   kernel/trace/trace_events_user.c:854:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/trace/trace_events_user.c:854:9: sparse:    void [noderef] __rcu *
   kernel/trace/trace_events_user.c:854:9: sparse:    void *

vim +/__user +811 kernel/trace/trace_events_user.c

   801	
   802	static ssize_t user_events_write(struct file *file, const char __user *ubuf,
   803					 size_t count, loff_t *ppos)
   804	{
   805		struct iovec iov;
   806		struct iov_iter i;
   807	
   808		if (unlikely(*ppos != 0))
   809			return -EFAULT;
   810	
 > 811		if (unlikely(import_single_range(READ, (char *)ubuf, count, &iov, &i)))
   812			return -EFAULT;
   813	
   814		return user_events_write_core(file, &i);
   815	}
   816	

-- 
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https://01.org/lkp