Re: [PATCH v2] PCI: mediatek: Fix sparse warning caused to virt_to_phys() prototype change

[kernel test robot]

Hi Stanislav,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus linus/master v6.7-rc2 next-20231121]
[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/Stanislav-Kinsburskii/PCI-mediatek-Fix-sparse-warning-caused-to-virt_to_phys-prototype-change/20231121-080253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/170052491316.21557.13173111699965824301.stgit%40skinsburskii.
patch subject: [PATCH v2] PCI: mediatek: Fix sparse warning caused to virt_to_phys() prototype change
config: openrisc-allmodconfig (https://download.01.org/0day-ci/archive/20231121/202311211958.Z1kPUdyp-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231121/202311211958.Z1kPUdyp-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311211958.Z1kPUdyp-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   drivers/pci/controller/pcie-mediatek.c: In function 'mtk_compose_msi_msg':
>> drivers/pci/controller/pcie-mediatek.c:400:62: warning: passing argument 1 of 'virt_to_phys' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     400 |         addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
         |                                                              ^
   In file included from arch/openrisc/include/asm/io.h:37,
                    from include/linux/io.h:13,
                    from include/linux/iopoll.h:14,
                    from drivers/pci/controller/pcie-mediatek.c:12:
   include/asm-generic/io.h:1003:57: note: expected 'volatile void *' but argument is of type 'const void *'
    1003 | static inline unsigned long virt_to_phys(volatile void *address)
         |                                          ~~~~~~~~~~~~~~~^~~~~~~
   drivers/pci/controller/pcie-mediatek.c: In function 'mtk_pcie_enable_msi':
   drivers/pci/controller/pcie-mediatek.c:523:66: warning: passing argument 1 of 'virt_to_phys' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     523 |         msg_addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
         |                                                                  ^
   include/asm-generic/io.h:1003:57: note: expected 'volatile void *' but argument is of type 'const void *'
    1003 | static inline unsigned long virt_to_phys(volatile void *address)
         |                                          ~~~~~~~~~~~~~~~^~~~~~~


vim +400 drivers/pci/controller/pcie-mediatek.c

   393	
   394	static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
   395	{
   396		struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
   397		phys_addr_t addr;
   398	
   399		/* MT2712/MT7622 only support 32-bit MSI addresses */
 > 400		addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
   401		msg->address_hi = 0;
   402		msg->address_lo = lower_32_bits(addr);
   403	
   404		msg->data = data->hwirq;
   405	
   406		dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
   407			(int)data->hwirq, msg->address_hi, msg->address_lo);
   408	}
   409	

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