Re: [PATCH v4 1/2] proc: pass file instead of inode to proc_mem_open

[kernel test robot <lkp@intel.com>]

Hi Adrian,

kernel test robot noticed the following build errors:

[auto build test ERROR on kees/for-next/pstore]
[also build test ERROR on kees/for-next/kspp linus/master v6.9 next-20240523]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Adrian-Ratiu/proc-restrict-proc-pid-mem/20240525-033201
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/pstore
patch link:    https://lore.kernel.org/r/20240524192858.3206-1-adrian.ratiu%40collabora.com
patch subject: [PATCH v4 1/2] proc: pass file instead of inode to proc_mem_open
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20240525/202405250413.EENbErWw-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 7aa382fd7257d9bd4f7fc50bb7078a3c26a1628c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240525/202405250413.EENbErWw-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405250413.EENbErWw-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/proc/task_nommu.c:3:
   In file included from include/linux/mm.h:2208:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> fs/proc/task_nommu.c:262:27: error: incompatible pointer types passing 'struct inode *' to parameter of type 'struct file *' [-Werror,-Wincompatible-pointer-types]
     262 |         priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
         |                                  ^~~~~
   fs/proc/internal.h:298:46: note: passing argument to parameter 'file' here
     298 | struct mm_struct *proc_mem_open(struct file *file, unsigned int mode);
         |                                              ^
   1 warning and 1 error generated.


vim +262 fs/proc/task_nommu.c

b76437579d1344 Siddhesh Poyarekar 2012-03-21  251  
b76437579d1344 Siddhesh Poyarekar 2012-03-21  252  static int maps_open(struct inode *inode, struct file *file,
b76437579d1344 Siddhesh Poyarekar 2012-03-21  253  		     const struct seq_operations *ops)
662795deb854b3 Eric W. Biederman  2006-06-26  254  {
dbf8685c8e2140 David Howells      2006-09-27  255  	struct proc_maps_private *priv;
dbf8685c8e2140 David Howells      2006-09-27  256  
27692cd56e2aa6 Oleg Nesterov      2014-10-09  257  	priv = __seq_open_private(file, ops, sizeof(*priv));
ce34fddb5bafb4 Oleg Nesterov      2014-10-09  258  	if (!priv)
ce34fddb5bafb4 Oleg Nesterov      2014-10-09  259  		return -ENOMEM;
ce34fddb5bafb4 Oleg Nesterov      2014-10-09  260  
2c03376d2db005 Oleg Nesterov      2014-10-09  261  	priv->inode = inode;
27692cd56e2aa6 Oleg Nesterov      2014-10-09 @262  	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
27692cd56e2aa6 Oleg Nesterov      2014-10-09  263  	if (IS_ERR(priv->mm)) {
27692cd56e2aa6 Oleg Nesterov      2014-10-09  264  		int err = PTR_ERR(priv->mm);
27692cd56e2aa6 Oleg Nesterov      2014-10-09  265  
27692cd56e2aa6 Oleg Nesterov      2014-10-09  266  		seq_release_private(inode, file);
27692cd56e2aa6 Oleg Nesterov      2014-10-09  267  		return err;
27692cd56e2aa6 Oleg Nesterov      2014-10-09  268  	}
27692cd56e2aa6 Oleg Nesterov      2014-10-09  269  
ce34fddb5bafb4 Oleg Nesterov      2014-10-09  270  	return 0;
662795deb854b3 Eric W. Biederman  2006-06-26  271  }
662795deb854b3 Eric W. Biederman  2006-06-26  272  

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