[linux-stable-rc:linux-4.14.y 9784/9999] arch/powerpc/platforms/cell/spufs/file.c:2076:6: error: variable 'wbox_stat' set but not used

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
head:   1c6114e2593492f39e02c775d117c95d86f9ae83
commit: 2de3b1d513e50b0b26dd90410842968118a6f46f [9784/9999] powerpc/spufs: fix copy_to_user while atomic
config: powerpc64-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=2de3b1d513e50b0b26dd90410842968118a6f46f
        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-4.14.y
        git checkout 2de3b1d513e50b0b26dd90410842968118a6f46f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc64 

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/include/asm/book3s/64/mmu-hash.h:24:0,
                    from arch/powerpc/include/asm/book3s/64/mmu.h:30,
                    from arch/powerpc/include/asm/mmu.h:305,
                    from arch/powerpc/include/asm/lppaca.h:36,
                    from arch/powerpc/include/asm/paca.h:21,
                    from arch/powerpc/include/asm/hw_irq.h:43,
                    from arch/powerpc/include/asm/irqflags.h:12,
                    from include/linux/irqflags.h:16,
                    from include/linux/spinlock.h:54,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from arch/powerpc/platforms/cell/spufs/file.c:25:
   arch/powerpc/include/asm/book3s/64/pgtable.h:1203:15: error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers]
    static inline const int pud_pfn(pud_t pud)
                  ^~~~~
   arch/powerpc/platforms/cell/spufs/file.c: In function '__spufs_wbox_info_read':
>> arch/powerpc/platforms/cell/spufs/file.c:2076:6: error: variable 'wbox_stat' set but not used [-Werror=unused-but-set-variable]
     u32 wbox_stat;
         ^~~~~~~~~
   cc1: all warnings being treated as errors


vim +/wbox_stat +2076 arch/powerpc/platforms/cell/spufs/file.c

2de3b1d513e50b Jeremy Kerr            2020-05-05  2070  
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2071  static ssize_t __spufs_wbox_info_read(struct spu_context *ctx,
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2072  			char __user *buf, size_t len, loff_t *pos)
69a2f00ce5d3a1 Dwayne Grant McConnell 2006-11-20  2073  {
69a2f00ce5d3a1 Dwayne Grant McConnell 2006-11-20  2074  	int i, cnt;
69a2f00ce5d3a1 Dwayne Grant McConnell 2006-11-20  2075  	u32 data[4];
69a2f00ce5d3a1 Dwayne Grant McConnell 2006-11-20 @2076  	u32 wbox_stat;
69a2f00ce5d3a1 Dwayne Grant McConnell 2006-11-20  2077  
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2078  	wbox_stat = ctx->csa.prob.mb_stat_R;
2de3b1d513e50b Jeremy Kerr            2020-05-05  2079  	cnt = spufs_wbox_info_cnt(ctx);
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2080  	for (i = 0; i < cnt; i++) {
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2081  		data[i] = ctx->csa.spu_mailbox_data[i];
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2082  	}
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2083  
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2084  	return simple_read_from_buffer(buf, len, pos, &data,
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2085  				cnt * sizeof(u32));
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2086  }
bf1ab978be2318 Dwayne Grant McConnell 2006-11-23  2087  

:::::: The code at line 2076 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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