Re: [PATCH v2] PCI/VGA: Move pci_set_vga_state() to vgaarb.c

[kernel test robot <lkp@intel.com>]

Hi Bjorn,

kernel test robot noticed the following build errors:

[auto build test ERROR on pci/next]
[also build test ERROR on pci/for-linus linus/master v7.0-rc6]
[cannot apply to next-20260403]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Bjorn-Helgaas/PCI-VGA-Move-pci_set_vga_state-to-vgaarb-c/20260314-150705
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20260312224713.1305228-1-bhelgaas%40google.com
patch subject: [PATCH v2] PCI/VGA: Move pci_set_vga_state() to vgaarb.c
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20260406/202604060643.IASWcNje-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260406/202604060643.IASWcNje-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604060643.IASWcNje-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/pci/vgaarb.c:229:7: error: call to undeclared function 'pci_set_vga_state_arch'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     229 |         rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
         |              ^
   drivers/pci/vgaarb.c:229:7: note: did you mean 'pci_set_vga_state'?
   drivers/pci/vgaarb.c:218:12: note: 'pci_set_vga_state' declared here
     218 | static int pci_set_vga_state(struct pci_dev *dev, bool decode,
         |            ^
     219 |                              unsigned int command_bits, u32 flags)
     220 | {
     221 |         struct pci_bus *bus;
     222 |         struct pci_dev *bridge;
     223 |         u16 cmd;
     224 |         int rc;
     225 | 
     226 |         WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY)));
     227 | 
     228 |         /* ARCH specific VGA enables */
     229 |         rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
         |              ~~~~~~~~~~~~~~~~~~~~~~
         |              pci_set_vga_state
   1 error generated.


vim +/pci_set_vga_state_arch +229 drivers/pci/vgaarb.c

   209	
   210	/**
   211	 * pci_set_vga_state - set VGA decode state on device and parents if requested
   212	 * @dev: the PCI device
   213	 * @decode: true = enable decoding, false = disable decoding
   214	 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
   215	 * @flags: traverse ancestors and change bridges
   216	 * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
   217	 */
   218	static int pci_set_vga_state(struct pci_dev *dev, bool decode,
   219				     unsigned int command_bits, u32 flags)
   220	{
   221		struct pci_bus *bus;
   222		struct pci_dev *bridge;
   223		u16 cmd;
   224		int rc;
   225	
   226		WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY)));
   227	
   228		/* ARCH specific VGA enables */
 > 229		rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
   230		if (rc)
   231			return rc;
   232	
   233		if (flags & PCI_VGA_STATE_CHANGE_DECODES) {
   234			pci_read_config_word(dev, PCI_COMMAND, &cmd);
   235			if (decode)
   236				cmd |= command_bits;
   237			else
   238				cmd &= ~command_bits;
   239			pci_write_config_word(dev, PCI_COMMAND, cmd);
   240		}
   241	
   242		if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
   243			return 0;
   244	
   245		bus = dev->bus;
   246		while (bus) {
   247			bridge = bus->self;
   248			if (bridge) {
   249				pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
   250						     &cmd);
   251				if (decode)
   252					cmd |= PCI_BRIDGE_CTL_VGA;
   253				else
   254					cmd &= ~PCI_BRIDGE_CTL_VGA;
   255				pci_write_config_word(bridge, PCI_BRIDGE_CONTROL,
   256						      cmd);
   257			}
   258			bus = bus->parent;
   259		}
   260		return 0;
   261	}
   262	

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