[linux-stable-rc:linux-4.4.y 9896/9999] arch/powerpc/platforms/cell/spufs/file.c:2132:6: error: variable 'wbox_stat' set but not used

[linux-stable-rc:linux-4.4.y 9896/9999] arch/powerpc/platforms/cell/spufs/file.c:2132:6: error: variable 'wbox_stat' set but not used

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y
head:   97fdbef74916fdbf7b965f6d0af619c09fc650bc
commit: cbd4cbc1e68408305476174479579276accd3595 [9896/9999] powerpc/spufs: fix copy_to_user while atomic
config: powerpc-cell_defconfig (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 7.5.0
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/stable/linux-stable-rc.git/commit/?id=cbd4cbc1e68408305476174479579276accd3595
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-4.4.y
        git checkout cbd4cbc1e68408305476174479579276accd3595
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/platforms/cell/spufs/file.c:28:0:
   include/linux/pagemap.h: In function 'fault_in_multipages_readable':
   include/linux/pagemap.h:632:16: error: variable 'c' set but not used [-Werror=unused-but-set-variable]
     volatile char c;
                   ^
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_regs_read':
   arch/powerpc/platforms/cell/spufs/file.c:492:11: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if (*pos >= sizeof(ctx->csa.lscsa->gprs))
              ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_regs_write':
   arch/powerpc/platforms/cell/spufs/file.c:511:11: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if (*pos >= sizeof(lscsa->gprs))
              ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_fpcr_write':
   arch/powerpc/platforms/cell/spufs/file.c:564:11: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if (*pos >= sizeof(lscsa->fpcr))
              ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_mbox_read':
   arch/powerpc/platforms/cell/spufs/file.c:621:30: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (count = 0; (count + 4) <= len; count += 4, udata++) {
                                 ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_ibox_read':
   arch/powerpc/platforms/cell/spufs/file.c:757:39: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
                                          ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_wbox_write':
   arch/powerpc/platforms/cell/spufs/file.c:911:39: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (count = 4, udata++; (count + 4) <= len; count += 4, udata++) {
                                          ^~
   arch/powerpc/platforms/cell/spufs/file.c: In function '__spufs_wbox_info_read':
>> arch/powerpc/platforms/cell/spufs/file.c:2132:6: error: variable 'wbox_stat' set but not used [-Werror=unused-but-set-variable]
     u32 wbox_stat;
         ^~~~~~~~~
   arch/powerpc/platforms/cell/spufs/file.c: In function '__spufs_proxydma_info_read':
   arch/powerpc/platforms/cell/spufs/file.c:2259:10: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if (len < ret)
             ^
   arch/powerpc/platforms/cell/spufs/file.c: In function 'spufs_switch_log_read':
   arch/powerpc/platforms/cell/spufs/file.c:2494:13: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     while (cnt < len) {
                ^
   arch/powerpc/platforms/cell/spufs/file.c:2531:13: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
      if (width < len)
                ^
   cc1: all warnings being treated as errors


vim +/wbox_stat +2132 arch/powerpc/platforms/cell/spufs/file.c

cbd4cbc1e684083 Jeremy Kerr            2020-05-05  2126  
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2127  static ssize_t __spufs_wbox_info_read(struct spu_context *ctx,
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2128  			char __user *buf, size_t len, loff_t *pos)
69a2f00ce5d3a19 Dwayne Grant McConnell 2006-11-20  2129  {
69a2f00ce5d3a19 Dwayne Grant McConnell 2006-11-20  2130  	int i, cnt;
69a2f00ce5d3a19 Dwayne Grant McConnell 2006-11-20  2131  	u32 data[4];
69a2f00ce5d3a19 Dwayne Grant McConnell 2006-11-20 @2132  	u32 wbox_stat;
69a2f00ce5d3a19 Dwayne Grant McConnell 2006-11-20  2133  
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2134  	wbox_stat = ctx->csa.prob.mb_stat_R;
cbd4cbc1e684083 Jeremy Kerr            2020-05-05  2135  	cnt = spufs_wbox_info_cnt(ctx);
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2136  	for (i = 0; i < cnt; i++) {
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2137  		data[i] = ctx->csa.spu_mailbox_data[i];
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2138  	}
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2139  
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2140  	return simple_read_from_buffer(buf, len, pos, &data,
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2141  				cnt * sizeof(u32));
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2142  }
bf1ab978be2318c Dwayne Grant McConnell 2006-11-23  2143  

:::::: The code at line 2132 was first introduced by commit
:::::: 69a2f00ce5d3a19a70b36f08eaf9049677277710 [POWERPC] spufs: Implement /mbox_info, /ibox_info, and /wbox_info.

:::::: TO: Dwayne Grant McConnell <decimal@us.ibm.com>
:::::: CC: Paul Mackerras <paulus@samba.org>

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

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