linux-kernel - [gustavoars:testing/fam01-next20230710 2/5] arch/sparc/mm/init_64.c:3057:31: error: array subscript -1 is outside array bounds of 'char[]'

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Date:   Tue, 11 Jul 2023 09:09:10 +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-next20230710 2/5]
 arch/sparc/mm/init_64.c:3057:31: 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-next20230710
head:   58f872f0089daa911786fdbd13d48a0c9147e5b1
commit: b30a1743f607192532d6ad43a08cdbd80051ca5a [2/5] Makefile: Enable -Warray-bounds
config: sparc64-randconfig-r002-20230710 (https://download.01.org/0day-ci/archive/20230711/202307110949.RG8TpHLo-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230711/202307110949.RG8TpHLo-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/202307110949.RG8TpHLo-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:2206:23: error: variable 'pagecv_flag' set but not used [-Werror=unused-but-set-variable]
    2206 |         unsigned long pagecv_flag;
         |                       ^~~~~~~~~~~
   In function 'kernel_lds_init',
       inlined from 'report_memory' at arch/sparc/mm/init_64.c:3069:2:
>> arch/sparc/mm/init_64.c:3057:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3057 |         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:3069:2:
   arch/sparc/mm/init_64.c:3059:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3059 |         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:3069:2:
   arch/sparc/mm/init_64.c:3061:31: error: array subscript -1 is outside array bounds of 'char[]' [-Werror=array-bounds]
    3061 |         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 +3057 arch/sparc/mm/init_64.c

f6d4fb5cc0475c bob picco 2014-03-03  3053  
f6d4fb5cc0475c bob picco 2014-03-03  3054  static void __init kernel_lds_init(void)
f6d4fb5cc0475c bob picco 2014-03-03  3055  {
f6d4fb5cc0475c bob picco 2014-03-03  3056  	code_resource.start = compute_kern_paddr(_text);
f6d4fb5cc0475c bob picco 2014-03-03 @3057  	code_resource.end   = compute_kern_paddr(_etext - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3058  	data_resource.start = compute_kern_paddr(_etext);
f6d4fb5cc0475c bob picco 2014-03-03  3059  	data_resource.end   = compute_kern_paddr(_edata - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3060  	bss_resource.start  = compute_kern_paddr(__bss_start);
f6d4fb5cc0475c bob picco 2014-03-03  3061  	bss_resource.end    = compute_kern_paddr(_end - 1);
f6d4fb5cc0475c bob picco 2014-03-03  3062  }
f6d4fb5cc0475c bob picco 2014-03-03  3063  

:::::: The code at line 3057 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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