linux-kernel - drivers/media/v4l2-core/videobuf2-dma-contig.c:484:2: error: implicit declaration of function 'dma_get_cache

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Date:	Sun, 31 Jul 2016 10:56:06 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: drivers/media/v4l2-core/videobuf2-dma-contig.c:484:2: error:
 implicit declaration of function 'dma_get_cache_alignment'

Hi,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7f155c702677d057d03b192ce652311de5434697
commit: e1c7e324539ada3b2b13ca2898bcb4948a9ef9db dma-mapping: always provide the dma_map_ops based implementation
date:   6 months 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 e1c7e324539ada3b2b13ca2898bcb4948a9ef9db
        # 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:484:2: 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 +484 drivers/media/v4l2-core/videobuf2-dma-contig.c

fb639eb3 Jan Kara            2015-07-13  478  	struct frame_vector *vec;
e15dab75 Tomasz Stanislawski 2012-06-14  479  	unsigned long offset;
fb639eb3 Jan Kara            2015-07-13  480  	int n_pages, i;
e15dab75 Tomasz Stanislawski 2012-06-14  481  	int ret = 0;
e15dab75 Tomasz Stanislawski 2012-06-14  482  	struct sg_table *sgt;
e15dab75 Tomasz Stanislawski 2012-06-14  483  	unsigned long contig_size;
d81e870d Marek Szyprowski    2012-06-12 @484  	unsigned long dma_align = dma_get_cache_alignment();
251a79f8 Hans Verkuil        2014-11-18  485  	DEFINE_DMA_ATTRS(attrs);
251a79f8 Hans Verkuil        2014-11-18  486  
251a79f8 Hans Verkuil        2014-11-18  487  	dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);

:::::: The code at line 484 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@...sung.com>
:::::: CC: Mauro Carvalho Chehab <mchehab@...hat.com>

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