[zx2c4-wireguard:jd/new-archs 3/9] arch/um/drivers/tty.c:26:24: error: 'NULL' undeclared

[zx2c4-wireguard:jd/new-archs 3/9] arch/um/drivers/tty.c:26:24: error: 'NULL' undeclared

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git jd/new-archs
head:   b41a21fc924011fb4c7463c8b7b4761dc798e795
commit: 2c1370ee8e1c862e1de8c624d7900d575a131150 [3/9] um: include sys/types.h instead of stddef.h for size_t
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220714/202207141802.1bmhOfxR-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git/commit/?id=2c1370ee8e1c862e1de8c624d7900d575a131150
        git remote add zx2c4-wireguard https://git.kernel.org/pub/scm/linux/kernel/git/zx2c4/wireguard-linux.git
        git fetch --no-tags zx2c4-wireguard jd/new-archs
        git checkout 2c1370ee8e1c862e1de8c624d7900d575a131150
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arch/um/drivers/tty.c: In function 'tty_chan_init':
>> arch/um/drivers/tty.c:26:24: error: 'NULL' undeclared (first use in this function)
      26 |                 return NULL;
         |                        ^~~~
   arch/um/drivers/tty.c:12:1: note: 'NULL' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
      11 | #include <um_malloc.h>
     +++ |+#include <stddef.h>
      12 | 
   arch/um/drivers/tty.c:26:24: note: each undeclared identifier is reported only once for each function it appears in
      26 |                 return NULL;
         |                        ^~~~
--
   arch/um/drivers/cow_user.c: In function 'read_cow_header':
>> arch/um/drivers/cow_user.c:296:17: error: implicit declaration of function 'offsetof' [-Werror=implicit-function-declaration]
     296 |         if (n < offsetof(typeof(header->v1), backing_file)) {
         |                 ^~~~~~~~
   arch/um/drivers/cow_user.c:17:1: note: 'offsetof' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
      16 | #include "cow_sys.h"
     +++ |+#include <stddef.h>
      17 | 
>> arch/um/drivers/cow_user.c:296:26: error: expected expression before 'typeof'
     296 |         if (n < offsetof(typeof(header->v1), backing_file)) {
         |                          ^~~~~~
   cc1: some warnings being treated as errors


vim +/NULL +26 arch/um/drivers/tty.c

^1da177e4c3f415 Linus Torvalds 2005-04-16  18  
5e7672ec3f059f7 Jeff Dike      2006-09-27  19  static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
^1da177e4c3f415 Linus Torvalds 2005-04-16  20  {
^1da177e4c3f415 Linus Torvalds 2005-04-16  21  	struct tty_chan *data;
^1da177e4c3f415 Linus Torvalds 2005-04-16  22  
^1da177e4c3f415 Linus Torvalds 2005-04-16  23  	if (*str != ':') {
e99525f97069004 Jeff Dike      2007-10-16  24  		printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
^1da177e4c3f415 Linus Torvalds 2005-04-16  25  		       "a device\n");
108ffa8cbfa323d Jeff Dike      2006-07-10 @26  		return NULL;
^1da177e4c3f415 Linus Torvalds 2005-04-16  27  	}
^1da177e4c3f415 Linus Torvalds 2005-04-16  28  	str++;
^1da177e4c3f415 Linus Torvalds 2005-04-16  29  
43f5b3085fdd27c Jeff Dike      2008-05-12  30  	data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
^1da177e4c3f415 Linus Torvalds 2005-04-16  31  	if (data == NULL)
108ffa8cbfa323d Jeff Dike      2006-07-10  32  		return NULL;
^1da177e4c3f415 Linus Torvalds 2005-04-16  33  	*data = ((struct tty_chan) { .dev 	= str,
^1da177e4c3f415 Linus Torvalds 2005-04-16  34  				     .raw 	= opts->raw });
^1da177e4c3f415 Linus Torvalds 2005-04-16  35  
108ffa8cbfa323d Jeff Dike      2006-07-10  36  	return data;
^1da177e4c3f415 Linus Torvalds 2005-04-16  37  }
^1da177e4c3f415 Linus Torvalds 2005-04-16  38  

:::::: The code at line 26 was first introduced by commit
:::::: 108ffa8cbfa323d462a2f4b49f38da3205d36e5a [PATCH] uml: formatting fixes

:::::: TO: Jeff Dike <jdike@addtoit.com>
:::::: CC: Linus Torvalds <torvalds@g5.osdl.org>

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