linux-kernel - [mark:arm64/ftrace/per-callsite-ops 4/6] include/acpi/actypes.h:525:42: warning: 'strncpy' specified bound 4 equals destination size

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Date:   Sat, 30 Apr 2022 07:15:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mark:arm64/ftrace/per-callsite-ops 4/6]
 include/acpi/actypes.h:525:42: warning: 'strncpy' specified bound 4 equals
 destination size

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace/per-callsite-ops
head:   2aaba224d039a36f7eca5ad68c77686d3546e4fa
commit: be98798b102a3e28fa0832c9c0473f42e14abe8b [4/6] HACK: arm64: ftrace: align pre-function literal pool
config: ia64-gensparse_defconfig (https://download.01.org/0day-ci/archive/20220430/202204300707.nx8b88Lb-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=be98798b102a3e28fa0832c9c0473f42e14abe8b
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark arm64/ftrace/per-callsite-ops
        git checkout be98798b102a3e28fa0832c9c0473f42e14abe8b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/acpi/acpica/

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

All warnings (new ones prefixed by >>):

   In file included from include/acpi/acpi.h:24,
                    from drivers/acpi/acpica/tbfind.c:10:
   drivers/acpi/acpica/tbfind.c: In function 'acpi_tb_find_table':
>> include/acpi/actypes.h:525:42: warning: 'strncpy' specified bound 4 equals destination size [-Wstringop-truncation]
     525 | #define ACPI_COPY_NAMESEG(dest,src)     (strncpy (ACPI_CAST_PTR (char, (dest)), ACPI_CAST_PTR (char, (src)), ACPI_NAMESEG_SIZE))
         |                                         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/acpi/acpica/tbfind.c:59:9: note: in expansion of macro 'ACPI_COPY_NAMESEG'
      59 |         ACPI_COPY_NAMESEG(header.signature, signature);
         |         ^~~~~~~~~~~~~~~~~
--
   In file included from include/acpi/acpi.h:24,
                    from drivers/acpi/acpica/utstring.c:8:
   drivers/acpi/acpica/utstring.c: In function 'acpi_ut_repair_name':
>> include/acpi/actypes.h:525:42: warning: 'strncpy' specified bound 4 equals destination size [-Wstringop-truncation]
     525 | #define ACPI_COPY_NAMESEG(dest,src)     (strncpy (ACPI_CAST_PTR (char, (dest)), ACPI_CAST_PTR (char, (src)), ACPI_NAMESEG_SIZE))
         |                                         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/acpi/acpica/utstring.c:148:9: note: in expansion of macro 'ACPI_COPY_NAMESEG'
     148 |         ACPI_COPY_NAMESEG(&original_name, name);
         |         ^~~~~~~~~~~~~~~~~


vim +/strncpy +525 include/acpi/actypes.h

ff60027174cf94b Bob Moore 2012-10-31  519  
50df4d8b0f6e197 Bob Moore 2008-12-31  520  #ifndef ACPI_MISALIGNMENT_NOT_SUPPORTED
5599fb69355d7a5 Bob Moore 2019-04-08  521  #define ACPI_COMPARE_NAMESEG(a,b)       (*ACPI_CAST_PTR (u32, (a)) == *ACPI_CAST_PTR (u32, (b)))
a3ce7a8e0dd9baa Bob Moore 2019-04-08  522  #define ACPI_COPY_NAMESEG(dest,src)     (*ACPI_CAST_PTR (u32, (dest)) = *ACPI_CAST_PTR (u32, (src)))
50df4d8b0f6e197 Bob Moore 2008-12-31  523  #else
3278675567dfb90 Bob Moore 2019-04-08  524  #define ACPI_COMPARE_NAMESEG(a,b)       (!strncmp (ACPI_CAST_PTR (char, (a)), ACPI_CAST_PTR (char, (b)), ACPI_NAMESEG_SIZE))
3278675567dfb90 Bob Moore 2019-04-08 @525  #define ACPI_COPY_NAMESEG(dest,src)     (strncpy (ACPI_CAST_PTR (char, (dest)), ACPI_CAST_PTR (char, (src)), ACPI_NAMESEG_SIZE))
50df4d8b0f6e197 Bob Moore 2008-12-31  526  #endif
50df4d8b0f6e197 Bob Moore 2008-12-31  527  

:::::: The code at line 525 was first introduced by commit
:::::: 3278675567dfb901d831d46849c386a4f932905e ACPICA: Rename nameseg length macro/define for clarity

:::::: TO: Bob Moore <robert.moore@...el.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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