tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4
head:   5d3c2d08737677b0c9fbceb8deb4affc2203d757
commit: 5f94a0c31e951c4196789d4b377d3806ff5bd4d0 [33/67] FROMLIST: mt76: mt7921: introduce PCIe ASPM support (L0s/L1/L1ss)
config: powerpc-randconfig-r001-20210618 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d1baf2895467735ab14f4b3415fce204c0cc8e7f)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.4
        git checkout 5f94a0c31e951c4196789d4b377d3806ff5bd4d0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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 >>):

   In file included from drivers/net/wireless/mediatek/mt76/mt7921/pci.c:6:
   In file included from include/linux/kernel.h:11:
   In file included from include/linux/compiler.h:323:
   arch/powerpc/include/asm/barrier.h:47:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
   #define __lwsync()      __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
           ^
   <built-in>:308:9: note: previous definition is here
   #define __lwsync __builtin_ppc_lwsync
           ^
>> drivers/net/wireless/mediatek/mt76/mt7921/pci.c:151:6: warning: no previous prototype for function 'mt7921_pci_enable_aspm' [-Wmissing-prototypes]
   void mt7921_pci_enable_aspm(struct pci_dev *pdev)
        ^
   drivers/net/wireless/mediatek/mt76/mt7921/pci.c:151:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void mt7921_pci_enable_aspm(struct pci_dev *pdev)
   ^
   static 
   2 warnings generated.


vim +/mt7921_pci_enable_aspm +151 drivers/net/wireless/mediatek/mt76/mt7921/pci.c

   150	
 > 151	void mt7921_pci_enable_aspm(struct pci_dev *pdev)
   152	{
   153		mt7921_pci_config_L1ss(pdev, true);
   154		mt7921_pci_config_L1(pdev, true);
   155	}
   156	

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