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Subjectarch/mips/pci/pci-ar2315.c:173:12: warning: no previous prototype for function 'phys_to_dma'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 31caf8b2a847214be856f843e251fc2ed2cd1075
commit: 5ceda74093a5c1c3f42a02b894df031f3bbc9af1 dma-direct: rename and cleanup __phys_to_dma
date: 5 months ago
config: mips-randconfig-r032-20210222 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ceda74093a5c1c3f42a02b894df031f3bbc9af1
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 5ceda74093a5c1c3f42a02b894df031f3bbc9af1
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

>> arch/mips/pci/pci-ar2315.c:173:12: warning: no previous prototype for function 'phys_to_dma' [-Wmissing-prototypes]
dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
^
arch/mips/pci/pci-ar2315.c:173:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
^
static
arch/mips/pci/pci-ar2315.c:178:13: warning: no previous prototype for function 'dma_to_phys' [-Wmissing-prototypes]
phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
^
arch/mips/pci/pci-ar2315.c:178:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
^
static
2 warnings generated.


vim +/phys_to_dma +173 arch/mips/pci/pci-ar2315.c

172
> 173 dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
174 {
175 return paddr + ar2315_dev_offset(dev);
176 }
177

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