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Subjectsound/soc/samsung/idma.c:250:22: error: implicit declaration of function 'pgprot_noncached'
Hi Stephen,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b791d1bdf9212d944d749a5c7ff6febdba241771
commit: bbd7ffdbef6888459f301c5889f3b14ada38b913 clk: Allow the common clk framework to be selectable
date: 5 weeks ago
config: m68k-randconfig-r025-20200612 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout bbd7ffdbef6888459f301c5889f3b14ada38b913
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

sound/soc/samsung/idma.c: In function 'idma_mmap':
>> sound/soc/samsung/idma.c:250:22: error: implicit declaration of function 'pgprot_noncached' [-Werror=implicit-function-declaration]
250 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
| ^~~~~~~~~~~~~~~~
>> sound/soc/samsung/idma.c:250:22: error: incompatible types when assigning to type 'pgprot_t' {aka 'struct <anonymous>'} from type 'int'
cc1: some warnings being treated as errors

vim +/pgprot_noncached +250 sound/soc/samsung/idma.c

f09aecd50f39d3 Sangbeom Kim 2011-07-20 240
ba40ab6275173e Kuninori Morimoto 2019-10-02 241 static int idma_mmap(struct snd_soc_component *component,
ba40ab6275173e Kuninori Morimoto 2019-10-02 242 struct snd_pcm_substream *substream,
f09aecd50f39d3 Sangbeom Kim 2011-07-20 243 struct vm_area_struct *vma)
f09aecd50f39d3 Sangbeom Kim 2011-07-20 244 {
f09aecd50f39d3 Sangbeom Kim 2011-07-20 245 struct snd_pcm_runtime *runtime = substream->runtime;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 246 unsigned long size, offset;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 247 int ret;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 248
f09aecd50f39d3 Sangbeom Kim 2011-07-20 249 /* From snd_pcm_lib_mmap_iomem */
f09aecd50f39d3 Sangbeom Kim 2011-07-20 @250 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
f09aecd50f39d3 Sangbeom Kim 2011-07-20 251 size = vma->vm_end - vma->vm_start;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 252 offset = vma->vm_pgoff << PAGE_SHIFT;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 253 ret = io_remap_pfn_range(vma, vma->vm_start,
f09aecd50f39d3 Sangbeom Kim 2011-07-20 254 (runtime->dma_addr + offset) >> PAGE_SHIFT,
f09aecd50f39d3 Sangbeom Kim 2011-07-20 255 size, vma->vm_page_prot);
f09aecd50f39d3 Sangbeom Kim 2011-07-20 256
f09aecd50f39d3 Sangbeom Kim 2011-07-20 257 return ret;
f09aecd50f39d3 Sangbeom Kim 2011-07-20 258 }
f09aecd50f39d3 Sangbeom Kim 2011-07-20 259

:::::: The code at line 250 was first introduced by commit
:::::: f09aecd50f39d35372e551491d9f36ff0f51ee4d ASoC: SAMSUNG: Add I2S0 internal dma driver

:::::: TO: Sangbeom Kim <sbkim73@samsung.com>
:::::: CC: Mark Brown <broonie@opensource.wolfsonmicro.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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