Hi Sean,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pci/next]
[also build test WARNING on v5.7-rc6 next-20200518]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Sean-V-Kelley/PCI-Add-basic-Compute-eXpress-Link-DVSEC-decode/20200519-004029
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: arc-defconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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

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

In file included from drivers/pci/of.c:16:
drivers/pci/pci.h: In function 'pci_cxl_mem_enable':
>> drivers/pci/pci.h:481:45: warning: no return statement in function returning non-void [-Wreturn-type]
481 | static inline int pci_cxl_mem_enable(struct pci_dev *dev) {}
|                                             ^~~~~~~
drivers/pci/pci.h: In function 'pci_cxl_cache_enable':
drivers/pci/pci.h:483:47: warning: no return statement in function returning non-void [-Wreturn-type]
483 | static inline int pci_cxl_cache_enable(struct pci_dev *dev) {}
|                                               ^~~~~~~

vim +481 drivers/pci/pci.h

   471	
   472	#ifdef CONFIG_PCI_CXL
   473	/* Compute eXpress Link */
   474	void pci_cxl_init(struct pci_dev *dev);
   475	int pci_cxl_mem_enable(struct pci_dev *dev);
   476	void pci_cxl_mem_disable(struct pci_dev *dev);
   477	int pci_cxl_cache_enable(struct pci_dev *dev);
   478	void pci_cxl_cache_disable(struct pci_dev *dev);
   479	#else
   480	static inline void pci_cxl_init(struct pci_dev *dev) { }
 > 481	static inline int pci_cxl_mem_enable(struct pci_dev *dev) {}
   482	static inline void pci_cxl_mem_disable(struct pci_dev *dev) {}
   483	static inline int pci_cxl_cache_enable(struct pci_dev *dev) {}
   484	static inline void pci_cxl_cache_disable(struct pci_dev *dev) {}
   485	#endif
   486	

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