Re: [PATCH] fuse: freezing abort when use wait_event_killable{,_exclusive}().

[kbuild test robot]

Hi cuilifei,

[auto build test WARNING on fuse/for-next]
[also build test WARNING on v4.9-rc7 next-20161202]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]

url:    
https://github.com/0day-ci/linux/commits/cuilifei/fuse-freezing-abort-when-use-wait_event_killable-_exclusive/20161202-234345
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git 
for-next
config: x86_64-randconfig-x013-201648 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/uapi/linux/fuse.h:121,
                    from fs/fuse/fuse_i.h:12,
                    from fs/fuse/dev.c:9:
   fs/fuse/dev.c: In function '__fuse_get_req':
   fs/fuse/dev.c:38:8: error: implicit declaration of function 'freezing' 
[-Werror=implicit-function-declaration]
      if (!freezing(current))     \
           ^
   include/linux/compiler.h:149:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> fs/fuse/dev.c:38:3: note: in expansion of macro 'if'
      if (!freezing(current))     \
      ^~
   fs/fuse/dev.c:176:10: note: in expansion of macro 'wait_fatal_freezable'
      intr = wait_fatal_freezable(fc->blocked_waitq,
             ^~~~~~~~~~~~~~~~~~~~
   fs/fuse/dev.c:40:11: error: implicit declaration of function 'try_to_freeze' 
[-Werror=implicit-function-declaration]
     } while (try_to_freeze());     \
              ^
   fs/fuse/dev.c:176:10: note: in expansion of macro 'wait_fatal_freezable'
      intr = wait_fatal_freezable(fc->blocked_waitq,
             ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/if +38 fs/fuse/dev.c

     3    Copyright (C) 2001-2008  Miklos Szeredi <mik...@szeredi.hu>
     4  
     5    This program can be distributed under the terms of the GNU GPL.
     6    See the file COPYING.
     7  */
     8  
   > 9  #include "fuse_i.h"
    10  
    11  #include <linux/init.h>
    12  #include <linux/module.h>
    13  #include <linux/poll.h>
    14  #include <linux/uio.h>
    15  #include <linux/miscdevice.h>
    16  #include <linux/pagemap.h>
    17  #include <linux/file.h>
    18  #include <linux/slab.h>
    19  #include <linux/pipe_fs_i.h>
    20  #include <linux/swap.h>
    21  #include <linux/splice.h>
    22  
    23  MODULE_ALIAS_MISCDEV(FUSE_MINOR);
    24  MODULE_ALIAS("devname:fuse");
    25  
    26  #define wait_fatal_freezable(wq, condition, exclusive)                  
\
    27  ({                                                                      
\
    28          int __ret = 0;                                                  
\
    29          do {                                                            
\
    30                  if (exclusive)                                          
\
    31                          __ret = wait_event_interruptible_exclusive(wq,  
\
    32                                                          condition);     
\
    33                  else                                                    
\
    34                          __ret = wait_event_interruptible(wq,            
\
    35                                                          condition);     
\
    36                  if (!__ret || fatal_signal_pending(current))            
\
    37                          break;                                          
\
  > 38                  if (!freezing(current))                                 
\
    39                          continue;                                       
\
    40          } while (try_to_freeze());                                      
\
    41          __ret;                                                          
\

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