Hi Thomas,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on pci/next]
[also build test WARNING on v5.9-rc1 next-20200821]
[cannot apply to tip/x86/core iommu/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Thomas-Gleixner/x86-PCI-XEN-genirq-Prepare-for-device-MSI/20200821-102235
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: x86_64-randconfig-r036-20200820 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b587ca93be114d07ec3bf654add97d7872325281)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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 >>):

>> drivers/irqchip/irq-ims-msi.c:122:1: warning: no previous prototype for function 'pci_ims_create_msi_irq_domain' [-Wmissing-prototypes]
   pci_ims_create_msi_irq_domain(struct pci_dev *pdev,
   ^
   drivers/irqchip/irq-ims-msi.c:121:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct irq_domain *
   ^
   static 
   1 warning generated.

# https://github.com/0day-ci/linux/commit/0333ab7407155d9c5f632563bce22eb7fec646df
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Thomas-Gleixner/x86-PCI-XEN-genirq-Prepare-for-device-MSI/20200821-102235
git checkout 0333ab7407155d9c5f632563bce22eb7fec646df
vim +/pci_ims_create_msi_irq_domain +122 drivers/irqchip/irq-ims-msi.c

   120	
   121	struct irq_domain *
 > 122	pci_ims_create_msi_irq_domain(struct pci_dev *pdev,

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