[md:devel 19/30] drivers/md/raid5-cache.c:836:24: sparse: incompatible types in comparison expression (different address spaces)

[md:devel 19/30] drivers/md/raid5-cache.c:836:24: sparse: incompatible types in comparison expression (different address spaces)

[kbuild test robot]

tree:   git://neil.brown.name/md devel
head:   c086427458276f6265b609a682651786e1281c82
commit: a62ddcf73e2fe3387dbf27280691045446be0e15 [19/30] raid5: log recovery
reproduce:
  # apt-get install sparse
  git checkout a62ddcf73e2fe3387dbf27280691045446be0e15
  make ARCH=x86_64 allmodconfig
  make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/md/raid5-cache.c:836:24: sparse: incompatible types in comparison expression (different address spaces)
   drivers/md/raid5-cache.c:840:25: sparse: incompatible types in comparison expression (different address spaces)

vim +836 drivers/md/raid5-cache.c

   820				continue;
   821			addr = kmap_atomic(sh->dev[disk_index].page);
   822			checksum = crc32_le(log->uuid_checksum, addr, PAGE_SIZE);
   823			kunmap_atomic(addr);
   824			if (checksum != sh->dev[disk_index].log_checksum)
   825				goto error;
   826		}
   827	
   828		for (disk_index = 0; disk_index < sh->disks; disk_index++) {
   829			struct md_rdev *rdev, *rrdev;
   830	
   831			if (!test_and_clear_bit(R5_Wantwrite,
   832						&sh->dev[disk_index].flags))
   833				continue;
   834	
   835			/* in case device is broken */
 > 836			rdev = rcu_dereference(conf->disks[disk_index].rdev);
   837			if (rdev)
   838				sync_page_io(rdev, stripe_sect, PAGE_SIZE,
   839					     sh->dev[disk_index].page, WRITE, false);
   840			rrdev = rcu_dereference(conf->disks[disk_index].replacement);
   841			if (rrdev)
   842				sync_page_io(rrdev, stripe_sect, PAGE_SIZE,
   843					     sh->dev[disk_index].page, WRITE, false);
   844		}

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