linux-kernel - [ammarfaizi2-block:arm64/linux/for-next/misc 5/7] arch/arm64/mm/init.c:90:19: error: conflicting type qualifiers for 'arm64_dma_phys

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Date:   Wed, 9 Mar 2022 02:54:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vijay Balakrishna <vijayb@...ux.microsoft.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>
Subject: [ammarfaizi2-block:arm64/linux/for-next/misc 5/7]
 arch/arm64/mm/init.c:90:19: error: conflicting type qualifiers for
 'arm64_dma_phys_limit'

tree:   https://github.com/ammarfaizi2/linux-block arm64/linux/for-next/misc
head:   819a47d24b61b5e2d660d19c8798f0f9b4498b73
commit: 031495635b4668f94e964e037ca93d0d38bfde58 [5/7] arm64: Do not defer reserve_crashkernel() for platforms with no DMA memory zones
config: arm64-randconfig-r014-20220308 (https://download.01.org/0day-ci/archive/20220309/202203090241.aj7paWeX-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/031495635b4668f94e964e037ca93d0d38bfde58
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block arm64/linux/for-next/misc
        git checkout 031495635b4668f94e964e037ca93d0d38bfde58
        # 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/

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

All errors (new ones prefixed by >>):

>> arch/arm64/mm/init.c:90:19: error: conflicting type qualifiers for 'arm64_dma_phys_limit'
      90 | const phys_addr_t arm64_dma_phys_limit = PHYS_MASK + 1;
         |                   ^~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/qrwlock.h:14,
                    from ./arch/arm64/include/generated/asm/qrwlock.h:1,
                    from arch/arm64/include/asm/spinlock.h:9,
                    from include/linux/spinlock.h:93,
                    from include/linux/swap.h:5,
                    from arch/arm64/mm/init.c:12:
   arch/arm64/include/asm/processor.h:102:20: note: previous declaration of 'arm64_dma_phys_limit' with type 'phys_addr_t' {aka 'long long unsigned int'}
     102 | extern phys_addr_t arm64_dma_phys_limit;
         |                    ^~~~~~~~~~~~~~~~~~~~


vim +/arm64_dma_phys_limit +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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org