Re: [PATCH] ipc, shm: make shmem attach/detach wait for mmap_sem killable

[kbuild test robot]

Hi Michal,

[auto build test ERROR on v4.5-rc7]
[also build test ERROR on next-20160309]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improving the system]

url:    
https://github.com/0day-ci/linux/commits/Michal-Hocko/ipc-shm-make-shmem-attach-detach-wait-for-mmap_sem-killable/20160309-182238
config: xtensa-allyesconfig (attached as .config)
reproduce:
        wget 
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
 -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

   ipc/shm.c: In function 'do_shmat':
>> ipc/shm.c:1203:2: error: implicit declaration of function 
>> 'down_write_killable' [-Werror=implicit-function-declaration]
     if (down_write_killable(&current->mm->mmap_sem)) {
     ^
   cc1: some warnings being treated as errors

vim +/down_write_killable +1203 ipc/shm.c

  1197          sfd->vm_ops = NULL;
  1198  
  1199          err = security_mmap_file(file, prot, flags);
  1200          if (err)
  1201                  goto out_fput;
  1202  
> 1203          if (down_write_killable(&current->mm->mmap_sem)) {
  1204                  err = -EINTR;
  1205                  goto out_fput;
  1206          }

---
0-DAY kernel test infrastructure                Open Source Technology Center
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