[linux-next:master 11113/11713] arch/arm64/mm/init.c:90:19: error: redefinition of 'arm64_dma_phys_limit' with a different type: 'const phys_addr_t' (aka 'const unsigned long long') vs 'phys_addr_t' (aka 'unsigned long long')

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   4e7a74a6856f8613dab9794da4b5cfb8fd54fb8c
commit: 031495635b4668f94e964e037ca93d0d38bfde58 [11113/11713] arm64: Do not defer reserve_crashkernel() for platforms with no DMA memory zones
config: arm64-randconfig-r012-20220309 (https://download.01.org/0day-ci/archive/20220310/202203100052.aZByW83b-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 276ca87382b8f16a65bddac700202924228982f6)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=031495635b4668f94e964e037ca93d0d38bfde58
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 031495635b4668f94e964e037ca93d0d38bfde58
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/mm/

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 >>):

>> arch/arm64/mm/init.c:90:19: error: redefinition of 'arm64_dma_phys_limit' with a different type: 'const phys_addr_t' (aka 'const unsigned long long') vs 'phys_addr_t' (aka 'unsigned long long')
   const phys_addr_t arm64_dma_phys_limit = PHYS_MASK + 1;
                     ^
   arch/arm64/include/asm/processor.h:102:20: note: previous declaration is here
   extern phys_addr_t arm64_dma_phys_limit;
                      ^
   1 error generated.


vim +90 arch/arm64/mm/init.c

    57	
    58	/*
    59	 * If the corresponding config options are enabled, we create both ZONE_DMA
    60	 * and ZONE_DMA32. By default ZONE_DMA covers the 32-bit addressable memory
    61	 * unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4).
    62	 * In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memory,
    63	 * otherwise it is empty.
    64	 *
    65	 * Memory reservation for crash kernel either done early or deferred
    66	 * depending on DMA memory zones configs (ZONE_DMA) --
    67	 *
    68	 * In absence of ZONE_DMA configs arm64_dma_phys_limit initialized
    69	 * here instead of max_zone_phys().  This lets early reservation of
    70	 * crash kernel memory which has a dependency on arm64_dma_phys_limit.
    71	 * Reserving memory early for crash kernel allows linear creation of block
    72	 * mappings (greater than page-granularity) for all the memory bank rangs.
    73	 * In this scheme a comparatively quicker boot is observed.
    74	 *
    75	 * If ZONE_DMA configs are defined, crash kernel memory reservation
    76	 * is delayed until DMA zone memory range size initilazation performed in
    77	 * zone_sizes_init().  The defer is necessary to steer clear of DMA zone
    78	 * memory range to avoid overlap allocation.  So crash kernel memory boundaries
    79	 * are not known when mapping all bank memory ranges, which otherwise means
    80	 * not possible to exclude crash kernel range from creating block mappings
    81	 * so page-granularity mappings are created for the entire memory range.
    82	 * Hence a slightly slower boot is observed.
    83	 *
    84	 * Note: Page-granularity mapppings are necessary for crash kernel memory
    85	 * range for shrinking its size via /sys/kernel/kexec_crash_size interface.
    86	 */
    87	#if IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32)
    88	phys_addr_t __ro_after_init arm64_dma_phys_limit;
    89	#else
  > 90	const phys_addr_t arm64_dma_phys_limit = PHYS_MASK + 1;
    91	#endif
    92	

---
0-DAY CI Kernel Test Service, Intel Corporation
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