[xiang-erofs:dev-test 5/6] fs/erofs/fscache.c:535:23: warning: no previous prototype for function 'erofs_fscache_acquire_cookie'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
head:   73ac9605cc83179e0d44a8c64d85ab81d5d7a57e
commit: 0c8acee18add4f65597f6a2a3111256bee50ffc8 [5/6] erofs: Support sharing cookies in the same domain
config: hexagon-randconfig-r025-20220918 (https://download.01.org/0day-ci/archive/20220918/202209181550.IB5iSy64-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git/commit/?id=0c8acee18add4f65597f6a2a3111256bee50ffc8
        git remote add xiang-erofs https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
        git fetch --no-tags xiang-erofs dev-test
        git checkout 0c8acee18add4f65597f6a2a3111256bee50ffc8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash fs/erofs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/erofs/fscache.c:535:23: warning: no previous prototype for function 'erofs_fscache_acquire_cookie' [-Wmissing-prototypes]
   struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
                         ^
   fs/erofs/fscache.c:535:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
   ^
   static 
   1 warning generated.


vim +/erofs_fscache_acquire_cookie +535 fs/erofs/fscache.c

   534	
 > 535	struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
   536							    char *name, bool need_inode)
   537	{
   538		struct fscache_volume *volume = EROFS_SB(sb)->volume;
   539		struct erofs_fscache *ctx;
   540		struct fscache_cookie *cookie;
   541		int ret;
   542	
   543		ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
   544		if (!ctx)
   545			return ERR_PTR(-ENOMEM);
   546	
   547		cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE,
   548						name, strlen(name), NULL, 0, 0);
   549		if (!cookie) {
   550			erofs_err(sb, "failed to get cookie for %s", name);
   551			ret = -EINVAL;
   552			goto err;
   553		}
   554	
   555		fscache_use_cookie(cookie, false);
   556		ctx->cookie = cookie;
   557	
   558		if (need_inode) {
   559			struct inode *const inode = new_inode(sb);
   560	
   561			if (!inode) {
   562				erofs_err(sb, "failed to get anon inode for %s", name);
   563				ret = -ENOMEM;
   564				goto err_cookie;
   565			}
   566	
   567			set_nlink(inode, 1);
   568			inode->i_size = OFFSET_MAX;
   569			inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
   570			mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
   571	
   572			ctx->inode = inode;
   573		}
   574	
   575		return ctx;
   576	
   577	err_cookie:
   578		fscache_unuse_cookie(ctx->cookie, NULL, NULL);
   579		fscache_relinquish_cookie(ctx->cookie, false);
   580	err:
   581		kfree(ctx);
   582		return ERR_PTR(ret);
   583	}
   584	

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