[linux-stable-rc:linux-4.4.y 8047/9999] arch/powerpc/mm/ppc_mmu_32.c:55:16: error: comparison between signed and unsigned integer expressions

[linux-stable-rc:linux-4.4.y 8047/9999] arch/powerpc/mm/ppc_mmu_32.c:55:16: error: comparison between signed and unsigned integer expressions

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y
head:   95a3867e897abd7811196123f81a119a75aba863
commit: 23f53171bec2190d3bda773b93281531235e83a6 [8047/9999] powerpc/book3s/32: fix number of bats in p/v_block_mapped()
config: powerpc-mpc834x_mds_defconfig (attached as .config)
compiler: powerpc-linux-gcc (GCC) 7.5.0
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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=23f53171bec2190d3bda773b93281531235e83a6
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.4.y
        git checkout 23f53171bec2190d3bda773b93281531235e83a6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/mm/ppc_mmu_32.c:26:0:
   include/linux/mm.h: In function 'is_vmalloc_addr':
   include/linux/mm.h:386:14: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     return addr >= VMALLOC_START && addr < VMALLOC_END;
                 ^~
   arch/powerpc/mm/ppc_mmu_32.c: At top level:
   arch/powerpc/mm/ppc_mmu_32.c:52:13: error: no previous prototype for 'v_mapped_by_bats' [-Werror=missing-prototypes]
    phys_addr_t v_mapped_by_bats(unsigned long va)
                ^~~~~~~~~~~~~~~~
   arch/powerpc/mm/ppc_mmu_32.c: In function 'v_mapped_by_bats':
>> arch/powerpc/mm/ppc_mmu_32.c:55:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (b = 0; b < ARRAY_SIZE(bat_addrs); ++b)
                   ^
   arch/powerpc/mm/ppc_mmu_32.c: At top level:
   arch/powerpc/mm/ppc_mmu_32.c:64:15: error: no previous prototype for 'p_mapped_by_bats' [-Werror=missing-prototypes]
    unsigned long p_mapped_by_bats(phys_addr_t pa)
                  ^~~~~~~~~~~~~~~~
   arch/powerpc/mm/ppc_mmu_32.c: In function 'p_mapped_by_bats':
   arch/powerpc/mm/ppc_mmu_32.c:67:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (b = 0; b < ARRAY_SIZE(bat_addrs); ++b)
                   ^
   cc1: all warnings being treated as errors


vim +55 arch/powerpc/mm/ppc_mmu_32.c

    48	
    49	/*
    50	 * Return PA for this VA if it is mapped by a BAT, or 0
    51	 */
    52	phys_addr_t v_mapped_by_bats(unsigned long va)
    53	{
    54		int b;
  > 55		for (b = 0; b < ARRAY_SIZE(bat_addrs); ++b)
    56			if (va >= bat_addrs[b].start && va < bat_addrs[b].limit)
    57				return bat_addrs[b].phys + (va - bat_addrs[b].start);
    58		return 0;
    59	}
    60	

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

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