[PATCH] erofs: add sysfs node to drop all compression-related caches

[kernel test robot]

Hi Chunhai,

kernel test robot noticed the following build errors:

[auto build test ERROR on xiang-erofs/dev-test]
[also build test ERROR on xiang-erofs/dev xiang-erofs/fixes linus/master v6.12-rc7 next-20241112]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chunhai-Guo/erofs-add-sysfs-node-to-drop-all-compression-related-caches/20241112-170412
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
patch link:    https://lore.kernel.org/r/20241112091403.586545-1-guochunhai%40vivo.com
patch subject: [PATCH] erofs: add sysfs node to drop all compression-related caches
config: i386-randconfig-003-20241112 (https://download.01.org/0day-ci/archive/20241113/202411130033.ZP2Akhk8-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241113/202411130033.ZP2Akhk8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411130033.ZP2Akhk8-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from fs/erofs/sysfs.c:9:
   In file included from fs/erofs/internal.h:11:
   In file included from include/linux/dax.h:6:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> fs/erofs/sysfs.c:175:3: error: call to undeclared function 'z_erofs_shrink_scan'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     175 |                 z_erofs_shrink_scan(sbi, ~0UL);
         |                 ^
   1 warning and 1 error generated.


vim +/z_erofs_shrink_scan +175 fs/erofs/sysfs.c

   132	
   133	static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
   134							const char *buf, size_t len)
   135	{
   136		struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
   137							s_kobj);
   138		struct erofs_attr *a = container_of(attr, struct erofs_attr, attr);
   139		unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset);
   140		unsigned long t;
   141		int ret;
   142	
   143		switch (a->attr_id) {
   144		case attr_pointer_ui:
   145			if (!ptr)
   146				return 0;
   147			ret = kstrtoul(skip_spaces(buf), 0, &t);
   148			if (ret)
   149				return ret;
   150			if (t != (unsigned int)t)
   151				return -ERANGE;
   152	#ifdef CONFIG_EROFS_FS_ZIP
   153			if (!strcmp(a->attr.name, "sync_decompress") &&
   154			    (t > EROFS_SYNC_DECOMPRESS_FORCE_OFF))
   155				return -EINVAL;
   156	#endif
   157			*(unsigned int *)ptr = t;
   158			return len;
   159		case attr_pointer_bool:
   160			if (!ptr)
   161				return 0;
   162			ret = kstrtoul(skip_spaces(buf), 0, &t);
   163			if (ret)
   164				return ret;
   165			if (t != 0 && t != 1)
   166				return -EINVAL;
   167			*(bool *)ptr = !!t;
   168			return len;
   169		case attr_drop_caches:
   170			ret = kstrtoul(skip_spaces(buf), 0, &t);
   171			if (ret)
   172				return ret;
   173			if (t != 1)
   174				return -EINVAL;
 > 175			z_erofs_shrink_scan(sbi, ~0UL);
   176			return len;
   177		}
   178		return 0;
   179	}
   180	

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