[dm-devel] [dm:dm-5.8 47/54] drivers/md/dm-zoned-reclaim.c:350:18: warning: variable 'dev' set but not used

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git dm-5.8
head:   44eaf01834bc7414ab5298d097ed4e142a714420
commit: 21a33c39f41e5fc4e9ecfdf958190c9dc4a86b94 [47/54] dm zoned: remove 'dev' argument from reclaim
config: parisc-randconfig-r024-20200519 (attached as .config)
compiler: hppa-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
        git checkout 21a33c39f41e5fc4e9ecfdf958190c9dc4a86b94
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

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

All warnings (new ones prefixed by >>, old ones prefixed by <<):

In file included from include/linux/mm.h:94,
from include/linux/bvec.h:13,
from include/linux/blk_types.h:10,
from include/linux/genhd.h:19,
from include/linux/blkdev.h:11,
from drivers/md/dm-zoned.h:12,
from drivers/md/dm-zoned-reclaim.c:8:
include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 |   pte_t old_pte;              |         ^~~~~~~
arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at'
322 | #define pte_clear(mm, addr, xp)  set_pte_at(mm, addr, xp, __pte(0))
|                                  ^~~~~~~~~~
include/asm-generic/pgtable.h:201:2: note: in expansion of macro 'pte_clear'
201 |  pte_clear(mm, address, ptep);
|  ^~~~~~~~~
include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit':
arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
96 |   pte_t old_pte;              |         ^~~~~~~
include/asm-generic/pgtable.h:640:2: note: in expansion of macro 'set_pte_at'
640 |  set_pte_at(vma->vm_mm, addr, ptep, pte);
|  ^~~~~~~~~~
drivers/md/dm-zoned-reclaim.c: In function 'dmz_do_reclaim':
>> drivers/md/dm-zoned-reclaim.c:350:18: warning: variable 'dev' set but not used [-Wunused-but-set-variable]
350 |  struct dmz_dev *dev;
|                  ^~~

vim +/dev +350 drivers/md/dm-zoned-reclaim.c

   341	
   342	/*
   343	 * Find a candidate zone for reclaim and process it.
   344	 */
   345	static int dmz_do_reclaim(struct dmz_reclaim *zrc)
   346	{
   347		struct dmz_metadata *zmd = zrc->metadata;
   348		struct dm_zone *dzone;
   349		struct dm_zone *rzone;
 > 350		struct dmz_dev *dev;
   351		unsigned long start;
   352		int ret;
   353	
   354		/* Get a data zone */
   355		dzone = dmz_get_zone_for_reclaim(zmd);
   356		if (IS_ERR(dzone))
   357			return PTR_ERR(dzone);
   358	
   359		start = jiffies;
   360		dev = dmz_zone_to_dev(zmd, dzone);
   361		if (dmz_is_rnd(dzone)) {
   362			if (!dmz_weight(dzone)) {
   363				/* Empty zone */
   364				dmz_reclaim_empty(zrc, dzone);
   365				ret = 0;
   366			} else {
   367				/*
   368				 * Reclaim the random data zone by moving its
   369				 * valid data blocks to a free sequential zone.
   370				 */
   371				ret = dmz_reclaim_rnd_data(zrc, dzone);
   372			}
   373			rzone = dzone;
   374	
   375		} else {
   376			struct dm_zone *bzone = dzone->bzone;
   377			sector_t chunk_block = 0;
   378	
   379			ret = dmz_first_valid_block(zmd, bzone, &chunk_block);
   380			if (ret < 0)
   381				goto out;
   382	
   383			if (ret == 0 || chunk_block >= dzone->wp_block) {
   384				/*
   385				 * The buffer zone is empty or its valid blocks are
   386				 * after the data zone write pointer.
   387				 */
   388				ret = dmz_reclaim_buf(zrc, dzone);
   389				rzone = bzone;
   390			} else {
   391				/*
   392				 * Reclaim the data zone by merging it into the
   393				 * buffer zone so that the buffer zone itself can
   394				 * be later reclaimed.
   395				 */
   396				ret = dmz_reclaim_seq_data(zrc, dzone);
   397				rzone = dzone;
   398			}
   399		}
   400	out:
   401		if (ret) {
   402			dmz_unlock_zone_reclaim(dzone);
   403			return ret;
   404		}
   405	
   406		ret = dmz_flush_metadata(zrc->metadata);
   407		if (ret) {
   408			DMDEBUG("(%s): Metadata flush for zone %u failed, err %d\n",
   409				dmz_metadata_label(zmd), rzone->id, ret);
   410			return ret;
   411		}
   412	
   413		DMDEBUG("(%s): Reclaimed zone %u in %u ms",
   414			dmz_metadata_label(zmd),
   415			rzone->id, jiffies_to_msecs(jiffies - start));
   416		return 0;
   417	}
   418	

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