[PATCH] dma-buf: Deny copy-on-writes mmaps

[kernel test robot]

Hi Andi,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.6-rc4 next-20231003]
[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/Andi-Shyti/dma-buf-Deny-copy-on-writes-mmaps/20231004-070556
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20231003230332.513051-1-andi.shyti%40linux.intel.com
patch subject: [PATCH] dma-buf: Deny copy-on-writes mmaps
config: sh-allyesconfig (https://download.01.org/0day-ci/archive/20231004/202310041156.Bi2Vshvb-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231004/202310041156.Bi2Vshvb-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310041156.Bi2Vshvb-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/dma-buf/dma-buf.c: In function 'dma_buf_get_unmapped_area':
>> drivers/dma-buf/dma-buf.c:142:27: error: 'struct mm_struct' has no member named 'get_unmapped_area'
     142 |         return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
         |                           ^~
   drivers/dma-buf/dma-buf.c:143:1: error: control reaches end of non-void function [-Werror=return-type]
     143 | }
         | ^
   cc1: some warnings being treated as errors


vim +142 drivers/dma-buf/dma-buf.c

   131	
   132	static unsigned long
   133	dma_buf_get_unmapped_area(struct file *file,
   134				  unsigned long addr,
   135				  unsigned long len,
   136				  unsigned long pgoff,
   137				  unsigned long flags)
   138	{
   139		if ((flags & MAP_TYPE) == MAP_PRIVATE)
   140			return -EINVAL;
   141	
 > 142		return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
   143	}
   144	

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