linux-kernel - include/asm-generic/percpu.h:21:44: warning: array subscript 32 is above array bounds of 'long unsigned int[32]'

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Message-ID: <202509222148.aujDHbuM-lkp@intel.com>
Date: Mon, 22 Sep 2025 21:32:48 +0800
From: kernel test robot <lkp@...el.com>
To: Yury Norov <yury.norov@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Brian Norris <briannorris@...omium.org>,
	Kees Cook <kees@...nel.org>, Nathan Chancellor <nathan@...nel.org>
Subject: include/asm-generic/percpu.h:21:44: warning: array subscript 32 is
 above array bounds of 'long unsigned int[32]'

Hi Yury,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   07e27ad16399afcd693be20211b0dfae63e0615f
commit: fda1dd3c54ef3c4200c2e77634a91610da973950 find: Switch from inline to __always_inline
date:   1 year, 1 month ago
config: riscv-randconfig-r111-20250922 (https://download.01.org/0day-ci/archive/20250922/202509222148.aujDHbuM-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250922/202509222148.aujDHbuM-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/202509222148.aujDHbuM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/compiler_types.h:174,
                    from <command-line>:
   drivers/base/test/test_async_driver_probe.c: In function 'test_async_probe_init':
>> include/asm-generic/percpu.h:21:44: warning: array subscript 32 is above array bounds of 'long unsigned int[32]' [-Warray-bounds]
    #define per_cpu_offset(x) (__per_cpu_offset[x])
   include/linux/compiler-gcc.h:35:26: note: in definition of macro 'RELOC_HIDE'
     (typeof(ptr)) (__ptr + (off));     \
                             ^~~
   include/linux/percpu-defs.h:236:2: note: in expansion of macro 'SHIFT_PERCPU_PTR'
     SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)));   \
     ^~~~~~~~~~~~~~~~
   include/linux/percpu-defs.h:236:26: note: in expansion of macro 'per_cpu_offset'
     SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)));   \
                             ^~~~~~~~~~~~~~
   include/linux/percpu-defs.h:269:29: note: in expansion of macro 'per_cpu_ptr'
    #define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
                                ^~~~~~~~~~~
   include/linux/topology.h:96:9: note: in expansion of macro 'per_cpu'
     return per_cpu(numa_node, cpu);
            ^~~~~~~


vim +21 include/asm-generic/percpu.h

^1da177e4c3f41 Linus Torvalds 2005-04-16  20  
a875a69f8b00a3 Ingo Molnar    2006-07-03 @21  #define per_cpu_offset(x) (__per_cpu_offset[x])
acdac87202a408 travis@....com 2008-01-30  22  #endif
acdac87202a408 travis@....com 2008-01-30  23  

:::::: The code at line 21 was first introduced by commit
:::::: a875a69f8b00a38b4f40d9632a4fc71a159f0e0d [PATCH] lockdep: add per_cpu_offset()

:::::: TO: Ingo Molnar <mingo@...e.hu>
:::::: CC: Linus Torvalds <torvalds@...osdl.org>

-- 
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https://github.com/intel/lkp-tests/wiki