[efi:next 10/10] drivers/firmware/efi/efi-bgrt.c:110:3: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t'

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
head:   a981cafa013805708cb0b393d95083144b45bad2
commit: a981cafa013805708cb0b393d95083144b45bad2 [10/10] acpi: bgrt: parse BGRT to obtain BMP address before it gets clobbered
config: i386-randconfig-b0-02011955 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout a981cafa013805708cb0b393d95083144b45bad2
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/firmware/efi/efi-bgrt.c: In function 'efi_bgrt_init':
>> drivers/firmware/efi/efi-bgrt.c:110:3: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' [-Wformat=]
      pr_notice("Ignoring BGRT: invalid length %lu (expected %zu)\n",
      ^

vim +110 drivers/firmware/efi/efi-bgrt.c

    26	
    27	void __init efi_bgrt_init(unsigned long rsdp_phys)
    28	{
    29		void *image;
    30		struct bmp_header bmp_header;
    31		struct acpi_table_bgrt *bgrt = &bgrt_tab;
    32		struct acpi_table_bgrt *table = NULL;
    33		struct acpi_table_rsdp *rsdp;
    34		struct acpi_table_header *hdr;
    35		u64 xsdt_phys = 0;
    36		u32 rsdt_phys = 0;
    37		size_t len;
    38	
    39		if (!efi_enabled(EFI_MEMMAP))
    40			return;
    41	
    42		/* map the root pointer table to find the xsdt/rsdt values */
    43		rsdp = early_memremap_ro(rsdp_phys, sizeof(*rsdp));
    44		if (rsdp) {
    45			if (ACPI_VALIDATE_RSDP_SIG(rsdp->signature)) {
    46				xsdt_phys = rsdp->xsdt_physical_address;
    47				rsdt_phys = rsdp->rsdt_physical_address;
    48			}
    49			early_memunmap(rsdp, sizeof(*rsdp));
    50		}
    51	
    52		if (WARN_ON(!xsdt_phys && !rsdt_phys))
    53			return;
    54	
    55		/* obtain the length of whichever table we will be using */
    56		hdr = early_memremap_ro(xsdt_phys ?: rsdt_phys, sizeof(*hdr));
    57		if (WARN_ON(!hdr))
    58			return;
    59		len = hdr->length;
    60		early_memunmap(hdr, sizeof(*hdr));
    61	
    62		/* remap with the correct length */
    63		hdr = early_memremap_ro(xsdt_phys ?: rsdt_phys, len);
    64		if (WARN_ON(!hdr))
    65			return;
    66	
    67		if (xsdt_phys) {
    68			struct acpi_table_xsdt *xsdt = (void *)hdr;
    69			int i;
    70	
    71			for (i = 0; i < (len - sizeof(*hdr)) / sizeof(u64); i++) {
    72				table = early_memremap_ro(xsdt->table_offset_entry[i],
    73							  sizeof(*table));
    74				if (WARN_ON(!table))
    75					break;
    76	
    77				if (ACPI_COMPARE_NAME(table->header.signature,
    78						      ACPI_SIG_BGRT))
    79					break;
    80				early_memunmap(table, sizeof(*table));
    81				table = NULL;
    82			}
    83		} else if (rsdt_phys) {
    84			struct acpi_table_rsdt *rsdt = (void *)hdr;
    85			int i;
    86	
    87			for (i = 0; i < (len - sizeof(*hdr)) / sizeof(u32); i++) {
    88				table = early_memremap_ro(rsdt->table_offset_entry[i],
    89							  sizeof(*table));
    90				if (WARN_ON(!table))
    91					break;
    92	
    93				if (ACPI_COMPARE_NAME(table->header.signature,
    94						      ACPI_SIG_BGRT))
    95					break;
    96				early_memunmap(table, sizeof(*table));
    97				table = NULL;
    98			}
    99		}
   100		early_memunmap(hdr, len);
   101	
   102		if (!table)
   103			return;
   104	
   105		len = table->header.length;
   106		memcpy(bgrt, table, min(len, sizeof(bgrt_tab)));
   107		early_memunmap(table, sizeof(*table));
   108	
   109		if (len < sizeof(bgrt_tab)) {
 > 110			pr_notice("Ignoring BGRT: invalid length %lu (expected %zu)\n",

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