Re: [PATCH] fcntl: allow to set O_DIRECT flag on pipe

[kbuild test robot <lkp@xxxxxxxxx>]

Hi Stanislav,

[auto build test ERROR on v4.4-rc5]
[also build test ERROR on next-20151215]

url:    https://github.com/0day-ci/linux/commits/Stanislav-Kinsburskiy/fcntl-allow-to-set-O_DIRECT-flag-on-pipe/20151216-000234
config: x86_64-randconfig-x011-12141150 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/fcntl.c: In function 'setfl':
>> fs/fcntl.c:55:7: error: implicit declaration of function 'IS_FIFO' [-Werror=implicit-function-declaration]
     if (!IS_FIFO(f->f_mode) && (arg & O_DIRECT)) {
          ^
>> fs/fcntl.c:55:15: error: 'f' undeclared (first use in this function)
     if (!IS_FIFO(f->f_mode) && (arg & O_DIRECT)) {
                  ^
   fs/fcntl.c:55:15: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors

vim +/IS_FIFO +55 fs/fcntl.c

    49		/* required for strict SunOS emulation */
    50		if (O_NONBLOCK != O_NDELAY)
    51		       if (arg & O_NDELAY)
    52			   arg |= O_NONBLOCK;
    53	
    54		/* Pipe packetized mode is controlled by O_DIRECT flag */
  > 55		if (!IS_FIFO(f->f_mode) && (arg & O_DIRECT)) {
    56			if (!filp->f_mapping || !filp->f_mapping->a_ops ||
    57				!filp->f_mapping->a_ops->direct_IO)
    58					return -EINVAL;

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