Re: [PATCH] dm: remove unneeded variable 'sz'

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

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Hi Yang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on dm/for-next]
[also build test ERROR on v5.12-rc2 next-20210309]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yang-Li/dm-remove-unneeded-variable-sz/20210309-173431
base:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next
config: x86_64-rhel-7.6-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/a0feb390ae71f527ea5582a23afa1889bba31eab
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yang-Li/dm-remove-unneeded-variable-sz/20210309-173431
        git checkout a0feb390ae71f527ea5582a23afa1889bba31eab
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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 drivers/md/dm.h:14,
                    from drivers/md/dm-ps-service-time.c:11:
   drivers/md/dm-ps-service-time.c: In function 'st_status':
>> include/linux/device-mapper.h:588:22: error: 'sz' undeclared (first use in this function); did you mean 's8'?
     588 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
         |                      ^~
   drivers/md/dm-ps-service-time.c:88:3: note: in expansion of macro 'DMEMIT'
      88 |   DMEMIT("0 ");
         |   ^~~~~~
   include/linux/device-mapper.h:588:22: note: each undeclared identifier is reported only once for each function it appears in
     588 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
         |                      ^~
   drivers/md/dm-ps-service-time.c:88:3: note: in expansion of macro 'DMEMIT'
      88 |   DMEMIT("0 ");
         |   ^~~~~~


vim +588 include/linux/device-mapper.h

0da336e5fab75c Alasdair G Kergon 2008-04-24  587  
0da336e5fab75c Alasdair G Kergon 2008-04-24 @588  #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
0da336e5fab75c Alasdair G Kergon 2008-04-24  589  			  0 : scnprintf(result + sz, maxlen - sz, x))
0da336e5fab75c Alasdair G Kergon 2008-04-24  590  

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

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