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SubjectRe: [PATCH 2/4] drivers core: Remove strcat uses around sysfs_emit and neaten
Hi Joe,

I love your patch! Yet something to improve:

[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on pm/linux-next linus/master v5.9-rc4 next-20200903]
[cannot apply to linux/master]
[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/Joe-Perches/drivers-core-Use-sysfs_emit-functions/20200908-021333
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 4024823563d05bbe880885c9987d14a7130801da
config: s390-randconfig-s031-20200908 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.2-191-g10164920-dirty
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=s390

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 >>):

drivers/base/memory.c: In function 'phys_index_show':
drivers/base/memory.c:122:9: error: implicit declaration of function 'sysfs_emit'; did you mean 'sysfs_init'? [-Werror=implicit-function-declaration]
122 | return sysfs_emit(buf, "%08lx\n", phys_index);
| ^~~~~~~~~~
| sysfs_init
drivers/base/memory.c: In function 'print_allowed_zone':
>> drivers/base/memory.c:317:9: error: implicit declaration of function 'sysfs_emit_at'; did you mean 'sysfs_init'? [-Werror=implicit-function-declaration]
317 | return sysfs_emit_at(buf, len, " %s", zone->name);
| ^~~~~~~~~~~~~
| sysfs_init
cc1: some warnings being treated as errors

# https://github.com/0day-ci/linux/commit/a8789a23413de463f5e591d57748493242aa4be4
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Joe-Perches/drivers-core-Use-sysfs_emit-functions/20200908-021333
git checkout a8789a23413de463f5e591d57748493242aa4be4
vim +317 drivers/base/memory.c

306
307 #ifdef CONFIG_MEMORY_HOTREMOVE
308 static int print_allowed_zone(char *buf, int len, int nid,
309 unsigned long start_pfn, unsigned long nr_pages,
310 int online_type, struct zone *default_zone)
311 {
312 struct zone *zone;
313
314 zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages);
315 if (zone == default_zone)
316 return 0;
> 317 return sysfs_emit_at(buf, len, " %s", zone->name);
318 }
319

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