linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10 1060/5872] arch/arm64/mm/mmu.c:1499:5: warning: no previous prototype for 'check_range_driver

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Date:   Thu, 31 Mar 2022 18:16:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sudarshan Rajagopalan <sudaraja@...eaurora.org>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: [ammarfaizi2-block:google/android/kernel/common/android12-trusty-5.10
 1060/5872] arch/arm64/mm/mmu.c:1499:5: warning: no previous prototype for
 'check_range_driver_managed'

Hi Sudarshan,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-trusty-5.10
head:   07055bfd3d810d41a38354693dfaa55a6f8c0025
commit: 1b4aca7d82ae9b40145484fa09ceab38a6a06062 [1060/5872] ANDROID: arm64/mm: implement {populate/depopulate}_range_driver_managed
config: arm64-buildonly-randconfig-r005-20220331 (https://download.01.org/0day-ci/archive/20220331/202203311842.wFWvHrHn-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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
        # https://github.com/ammarfaizi2/linux-block/commit/1b4aca7d82ae9b40145484fa09ceab38a6a06062
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-trusty-5.10
        git checkout 1b4aca7d82ae9b40145484fa09ceab38a6a06062
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/mm/ drivers/gpu/drm/hisilicon/kirin/

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

All warnings (new ones prefixed by >>):

>> arch/arm64/mm/mmu.c:1499:5: warning: no previous prototype for 'check_range_driver_managed' [-Wmissing-prototypes]
    1499 | int check_range_driver_managed(u64 start, u64 size, const char *resource_name)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/printk.h:7,
                    from include/linux/kernel.h:16,
                    from arch/arm64/mm/mmu.c:11:
   arch/arm64/mm/mmu.c: In function 'check_range_driver_managed':
   include/linux/kern_levels.h:5:25: warning: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'u64' {aka 'long long unsigned int'} [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/kern_levels.h:11:25: note: in expansion of macro 'KERN_SOH'
      11 | #define KERN_ERR        KERN_SOH "3"    /* error conditions */
         |                         ^~~~~~~~
   include/linux/printk.h:343:16: note: in expansion of macro 'KERN_ERR'
     343 |         printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~
   arch/arm64/mm/mmu.c:1509:17: note: in expansion of macro 'pr_err'
    1509 |                 pr_err("%s: couldn't find memory resource for start 0x%lx\n",
         |                 ^~~~~~


vim +/check_range_driver_managed +1499 arch/arm64/mm/mmu.c

  1498	
> 1499	int check_range_driver_managed(u64 start, u64 size, const char *resource_name)
  1500	{
  1501		struct mem_section *ms;
  1502		unsigned long pfn = __phys_to_pfn(start);
  1503		unsigned long end_pfn = __phys_to_pfn(start + size);
  1504		struct resource *res;
  1505		unsigned long flags;
  1506	
  1507		res = lookup_resource(&iomem_resource, start);
  1508		if (!res) {
  1509			pr_err("%s: couldn't find memory resource for start 0x%lx\n",
  1510				   __func__, start);
  1511			return -EINVAL;
  1512		}
  1513	
  1514		flags = res->flags;
  1515	
  1516		if (!(flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) ||
  1517		    strstr(resource_name, "System RAM (") != resource_name)
  1518			return -EINVAL;
  1519	
  1520		for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
  1521			ms = __pfn_to_section(pfn);
  1522			if (early_section(ms))
  1523				return -EINVAL;
  1524		}
  1525	
  1526		return 0;
  1527	}
  1528	

-- 
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https://01.org/lkp