[hch-misc:m68k-set_fs 5/6] arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used

[kernel test robot <lkp@intel.com>]

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tree:   git://git.infradead.org/users/hch/misc.git m68k-set_fs
head:   dc7590aca76df8c1ead0ebf59e3787d5555779d6
commit: bd01d8a7268b406331c39707183b2c42626eff8e [5/6] m68k: provide __{get,put}_kernel_nofault
config: m68k-randconfig-r035-20210707 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
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
        git remote add hch-misc git://git.infradead.org/users/hch/misc.git
        git fetch --no-tags hch-misc m68k-set_fs
        git checkout bd01d8a7268b406331c39707183b2c42626eff8e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/uaccess.h:11,
                    from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/rcuwait.h:6,
                    from include/linux/percpu-rwsem.h:7,
                    from include/linux/fs.h:33,
                    from include/linux/huge_mm.h:8,
                    from include/linux/mm.h:725,
                    from mm/maccess.c:6:
   mm/maccess.c: In function 'copy_from_kernel_nofault':
>> arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used [-Wunused-but-set-variable]
     197 |  type __gk_dst = *(type *)(dst);     \
         |       ^~~~~~~~
   mm/maccess.c:19:3: note: in expansion of macro '__get_kernel_nofault'
      19 |   __get_kernel_nofault(dst, src, type, err_label);  \
         |   ^~~~~~~~~~~~~~~~~~~~
   mm/maccess.c:31:2: note: in expansion of macro 'copy_from_kernel_nofault_loop'
      31 |  copy_from_kernel_nofault_loop(dst, src, size, u64, Efault);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used [-Wunused-but-set-variable]
     197 |  type __gk_dst = *(type *)(dst);     \
         |       ^~~~~~~~
   mm/maccess.c:19:3: note: in expansion of macro '__get_kernel_nofault'
      19 |   __get_kernel_nofault(dst, src, type, err_label);  \
         |   ^~~~~~~~~~~~~~~~~~~~
   mm/maccess.c:32:2: note: in expansion of macro 'copy_from_kernel_nofault_loop'
      32 |  copy_from_kernel_nofault_loop(dst, src, size, u32, Efault);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used [-Wunused-but-set-variable]
     197 |  type __gk_dst = *(type *)(dst);     \
         |       ^~~~~~~~
   mm/maccess.c:19:3: note: in expansion of macro '__get_kernel_nofault'
      19 |   __get_kernel_nofault(dst, src, type, err_label);  \
         |   ^~~~~~~~~~~~~~~~~~~~
   mm/maccess.c:33:2: note: in expansion of macro 'copy_from_kernel_nofault_loop'
      33 |  copy_from_kernel_nofault_loop(dst, src, size, u16, Efault);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used [-Wunused-but-set-variable]
     197 |  type __gk_dst = *(type *)(dst);     \
         |       ^~~~~~~~
   mm/maccess.c:19:3: note: in expansion of macro '__get_kernel_nofault'
      19 |   __get_kernel_nofault(dst, src, type, err_label);  \
         |   ^~~~~~~~~~~~~~~~~~~~
   mm/maccess.c:34:2: note: in expansion of macro 'copy_from_kernel_nofault_loop'
      34 |  copy_from_kernel_nofault_loop(dst, src, size, u8, Efault);
         |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   mm/maccess.c: In function 'strncpy_from_kernel_nofault':
>> arch/m68k/include/asm/uaccess.h:197:7: warning: variable '__gk_dst' set but not used [-Wunused-but-set-variable]
     197 |  type __gk_dst = *(type *)(dst);     \
         |       ^~~~~~~~
   mm/maccess.c:76:3: note: in expansion of macro '__get_kernel_nofault'
      76 |   __get_kernel_nofault(dst, src, u8, Efault);
         |   ^~~~~~~~~~~~~~~~~~~~


vim +/__gk_dst +197 arch/m68k/include/asm/uaccess.h

   194	
   195	#define __get_kernel_nofault(dst, src, type, err_label)			\
   196	do {									\
 > 197		type __gk_dst = *(type *)(dst);					\
   198		type *__gk_src = (type *)(src);					\
   199		int __gk_err = 0;						\
   200										\
   201		switch (sizeof(type)) {						\
   202		case 1:								\
   203			__get_user_asm("move", __gk_err, __gk_dst, __gk_src, u8, b, d); \
   204			break;							\
   205		case 2:								\
   206			__get_user_asm("move", __gk_err, __gk_dst, __gk_src, u16, w, r); \
   207			break;							\
   208		case 4:								\
   209			__get_user_asm("move", __gk_err, __gk_dst, __gk_src, u32, l, r); \
   210			break;							\
   211		case 8:								\
   212			__get_user_asm8("move", __gk_err, __gk_dst, __gk_src);	\
   213			break;							\
   214		default:							\
   215			BUILD_BUG();						\
   216			break;							\
   217		}								\
   218		if (unlikely(__gk_err))						\
   219			goto err_label;						\
   220	} while (0)
   221	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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