drivers/media/v4l2-core/videobuf2-dma-contig.c:486:2: error: implicit declaration of function 'dma_get_cache_alignment'

[kbuild test robot]

Hi Hans,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   28e68154c5e2793123b248d38cf17b34dcb16d87
commit: c1023ba74fc77dc56dc317bd98f5060aab889ac1 [media] drivers/media/platform/Kconfig: fix VIDEO_MEDIATEK_VCODEC dependency
date:   8 weeks ago
config: m32r-allyesconfig (attached as .config)
compiler: m32r-linux-gcc (GCC) 4.9.0
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
        git checkout c1023ba74fc77dc56dc317bd98f5060aab889ac1
        # save the attached .config to linux build tree
        make.cross ARCH=m32r 

All errors (new ones prefixed by >>):

   drivers/media/v4l2-core/videobuf2-dma-contig.c: In function 'vb2_dc_get_userptr':
>> drivers/media/v4l2-core/videobuf2-dma-contig.c:486:2: error: implicit declaration of function 'dma_get_cache_alignment' [-Werror=implicit-function-declaration]
     unsigned long dma_align = dma_get_cache_alignment();
     ^
   cc1: some warnings being treated as errors

vim +/dma_get_cache_alignment +486 drivers/media/v4l2-core/videobuf2-dma-contig.c

774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  470  {
774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  471  	/* really, we cannot do anything better at this point */
774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  472  	return (dma_addr_t)(pfn) << PAGE_SHIFT;
774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  473  }
774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  474  #endif
774d2301 drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2013-06-19  475  
36c0f8b3 drivers/media/v4l2-core/videobuf2-dma-contig.c Hans Verkuil        2016-04-15  476  static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
cd474037 drivers/media/v4l2-core/videobuf2-dma-contig.c Hans Verkuil        2014-11-18  477  	unsigned long size, enum dma_data_direction dma_dir)
1a758d4e drivers/media/video/videobuf2-dma-contig.c     Pawel Osciak        2010-10-11  478  {
1a758d4e drivers/media/video/videobuf2-dma-contig.c     Pawel Osciak        2010-10-11  479  	struct vb2_dc_buf *buf;
fb639eb3 drivers/media/v4l2-core/videobuf2-dma-contig.c Jan Kara            2015-07-13  480  	struct frame_vector *vec;
e15dab75 drivers/media/v4l2-core/videobuf2-dma-contig.c Tomasz Stanislawski 2012-06-14  481  	unsigned long offset;
fb639eb3 drivers/media/v4l2-core/videobuf2-dma-contig.c Jan Kara            2015-07-13  482  	int n_pages, i;
e15dab75 drivers/media/v4l2-core/videobuf2-dma-contig.c Tomasz Stanislawski 2012-06-14  483  	int ret = 0;
e15dab75 drivers/media/v4l2-core/videobuf2-dma-contig.c Tomasz Stanislawski 2012-06-14  484  	struct sg_table *sgt;
e15dab75 drivers/media/v4l2-core/videobuf2-dma-contig.c Tomasz Stanislawski 2012-06-14  485  	unsigned long contig_size;
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12 @486  	unsigned long dma_align = dma_get_cache_alignment();
251a79f8 drivers/media/v4l2-core/videobuf2-dma-contig.c Hans Verkuil        2014-11-18  487  	DEFINE_DMA_ATTRS(attrs);
251a79f8 drivers/media/v4l2-core/videobuf2-dma-contig.c Hans Verkuil        2014-11-18  488  
251a79f8 drivers/media/v4l2-core/videobuf2-dma-contig.c Hans Verkuil        2014-11-18  489  	dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12  490  
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12  491  	/* Only cache aligned DMA transfers are reliable */
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12  492  	if (!IS_ALIGNED(vaddr | size, dma_align)) {
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12  493  		pr_debug("user data must be aligned to %lu bytes\n", dma_align);
d81e870d drivers/media/v4l2-core/videobuf2-dma-contig.c Marek Szyprowski    2012-06-12  494  		return ERR_PTR(-EINVAL);

:::::: The code at line 486 was first introduced by commit
:::::: d81e870d5afa1b0a95ea94c4052d3c7e973fae8c [media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned

:::::: TO: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
:::::: CC: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>

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