[ambarus:spi-nor/quad-v3 21/38] include/linux/compiler.h:58:31: warning: 'ret' is used uninitialized in this function

[ambarus:spi-nor/quad-v3 21/38] include/linux/compiler.h:58:31: warning: 'ret' is used uninitialized in this function

[kbuild test robot]

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tree:   https://github.com/ambarus/linux-0day spi-nor/quad-v3
head:   1b964e2c2dda78f5abd8245a612def9de93018d3
commit: 7b2087807e922dee46fb271479251023fa127221 [21/38] mtd: spi-nor: Check for errors after each Register Operation
config: i386-randconfig-a003-201943 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-14) 7.4.0
reproduce:
        git checkout 7b2087807e922dee46fb271479251023fa127221
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All warnings (new ones prefixed by >>):

   drivers/mtd/spi-nor/spi-nor.c: In function 'st_micron_set_4byte':
   drivers/mtd/spi-nor/spi-nor.c:598:6: warning: value computed is not used [-Wunused-value]
     ret == spi_nor_write_enable(nor);
     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/err.h:5:0,
                    from drivers/mtd/spi-nor/spi-nor.c:10:
>> include/linux/compiler.h:58:31: warning: 'ret' is used uninitialized in this function [-Wuninitialized]
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                  ^~~~~~~~~~~~~~~~~~~~
   drivers/mtd/spi-nor/spi-nor.c:596:6: note: 'ret' was declared here
     int ret;
         ^~~
--
   drivers/mtd//spi-nor/spi-nor.c: In function 'st_micron_set_4byte':
   drivers/mtd//spi-nor/spi-nor.c:598:6: warning: value computed is not used [-Wunused-value]
     ret == spi_nor_write_enable(nor);
     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/err.h:5:0,
                    from drivers/mtd//spi-nor/spi-nor.c:10:
>> include/linux/compiler.h:58:31: warning: 'ret' is used uninitialized in this function [-Wuninitialized]
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                  ^~~~~~~~~~~~~~~~~~~~
   drivers/mtd//spi-nor/spi-nor.c:596:6: note: 'ret' was declared here
     int ret;
         ^~~

vim +/ret +58 include/linux/compiler.h

a15fd609ad53a6 Linus Torvalds 2019-03-20  57  
a15fd609ad53a6 Linus Torvalds 2019-03-20 @58  #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
a15fd609ad53a6 Linus Torvalds 2019-03-20  59  

:::::: The code at line 58 was first introduced by commit
:::::: a15fd609ad53a631a927c6680e8fb606f42a712b tracing: Simplify "if" macro code

:::::: TO: Linus Torvalds <torvalds@linux-foundation.org>
:::::: CC: Steven Rostedt (VMware) <rostedt@goodmis.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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