linux-kernel - [gustavoars:testing/fam01-next20230815 2/4] arch/sparc/mm/init_64.c:3088:31: error: array subscript -1 is outside array bounds of 'char[]'

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Message-ID: <202308160635.14367Mw4-lkp@intel.com>
Date:   Wed, 16 Aug 2023 06:38:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [gustavoars:testing/fam01-next20230815 2/4]
 arch/sparc/mm/init_64.c:3088:31: error: array subscript -1 is outside array
 bounds of 'char[]'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/fam01-next20230815
head:   7d3ebbc1f4bfba0fdd9ade111e93edf6be617187
commit: 79dcfe2fd8c85fe5a9eeb8ed4026d50987d107b5 [2/4] Makefile: Enable -Warray-bounds
config: sparc64-randconfig-r001-20230816 (https://download.01.org/0day-ci/archive/20230816/202308160635.14367Mw4-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230816/202308160635.14367Mw4-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308160635.14367Mw4-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/sparc/mm/init_64.c: In function 'sun4v_linear_pte_xor_finalize':
   arch/sparc/mm/init_64.c:2220:23: error: variable 'pagecv_flag' set but not used [-Werror=unused-but-set-variable]
    2220 |         unsigned long pagecv_flag;
         |                       ^~~~~~~~~~~
   arch/sparc/mm/init_64.c: At top level:
   arch/sparc/mm/init_64.c:2644:6: error: no previous prototype for 'vmemmap_free' [-Werror=missing-prototypes]
    2644 | void vmemmap_free(unsigned long start, unsigned long end,
         |      ^~~~~~~~~~~~
   In function 'kernel_lds_init',
       inlined from 'report_memory' at arch/sparc/mm/init_64.c:3100:2:
>> arch/sparc/mm/init_64.c:3088:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3088 |         code_resource.end   = compute_kern_paddr(_etext - 1);
         |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/sparc/include/asm/sections.h:6,
                    from include/linux/interrupt.h:21,
                    from include/linux/kernel_stat.h:9,
                    from include/linux/cgroup.h:26,
                    from include/linux/hugetlb.h:10,
                    from arch/sparc/mm/init_64.c:16:
   include/asm-generic/sections.h: In function 'report_memory':
   include/asm-generic/sections.h:35:32: note: at offset -1 into object '_etext' of size [0, 9223372036854775807]
      35 | extern char _text[], _stext[], _etext[];
         |                                ^~~~~~
   In function 'kernel_lds_init',
       inlined from 'report_memory' at arch/sparc/mm/init_64.c:3100:2:
   arch/sparc/mm/init_64.c:3090:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3090 |         data_resource.end   = compute_kern_paddr(_edata - 1);
         |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/sections.h: In function 'report_memory':
   include/asm-generic/sections.h:36:32: note: at offset -1 into object '_edata' of size [0, 9223372036854775807]
      36 | extern char _data[], _sdata[], _edata[];
         |                                ^~~~~~
   In function 'kernel_lds_init',
       inlined from 'report_memory' at arch/sparc/mm/init_64.c:3100:2:
   arch/sparc/mm/init_64.c:3092:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3092 |         bss_resource.end    = compute_kern_paddr(_end - 1);
         |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/sections.h: In function 'report_memory':
   include/asm-generic/sections.h:41:13: note: at offset -1 into object '_end' of size [0, 9223372036854775807]
      41 | extern char _end[];
         |             ^~~~
   cc1: all warnings being treated as errors


vim +3088 arch/sparc/mm/init_64.c

f6d4fb5cc0475c bob picco 2014-03-03  3084  
f6d4fb5cc0475c bob picco 2014-03-03  3085  static void __init kernel_lds_init(void)
f6d4fb5cc0475c bob picco 2014-03-03  3086  {
f6d4fb5cc0475c bob picco 2014-03-03  3087  	code_resource.start = compute_kern_paddr(_text);
f6d4fb5cc0475c bob picco 2014-03-03 @3088  	code_resource.end   = compute_kern_paddr(_etext - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3089  	data_resource.start = compute_kern_paddr(_etext);
f6d4fb5cc0475c bob picco 2014-03-03  3090  	data_resource.end   = compute_kern_paddr(_edata - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3091  	bss_resource.start  = compute_kern_paddr(__bss_start);
f6d4fb5cc0475c bob picco 2014-03-03  3092  	bss_resource.end    = compute_kern_paddr(_end - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3093  }
f6d4fb5cc0475c bob picco 2014-03-03  3094  

:::::: The code at line 3088 was first introduced by commit
:::::: f6d4fb5cc0475c36437a618db31cbb7f2bf7c282 sparc64 - add mem to iomem resource

:::::: TO: bob picco <bpicco@...oft.net>
:::::: CC: David S. Miller <davem@...emloft.net>

-- 
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