[vfs-idmapping:fs.posix_acl.vfsuid 32/37] fs/xattr.c:585: undefined reference to `posix_acl_from_xattr'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git fs.posix_acl.vfsuid
head:   d37e11d9b40fc35810217121aa3205b7975fd4c6
commit: fcb72ace104f57d790022ca5895c44a9379dc0a7 [32/37] xattr: use POSIX ACL api
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220909/202209092359.kTlM7Ca6-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git/commit/?id=fcb72ace104f57d790022ca5895c44a9379dc0a7
        git remote add vfs-idmapping https://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git
        git fetch --no-tags vfs-idmapping fs.posix_acl.vfsuid
        git checkout fcb72ace104f57d790022ca5895c44a9379dc0a7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   /usr/bin/ld: warning: arch/x86/um/checksum_32.o: missing .note.GNU-stack section implies executable stack
   /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
   /usr/bin/ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions
   /usr/bin/ld: fs/xattr.o: in function `setxattr_convert':
>> fs/xattr.c:585: undefined reference to `posix_acl_from_xattr'
   collect2: error: ld returned 1 exit status


vim +585 fs/xattr.c

   575	
   576	static int setxattr_convert(struct user_namespace *mnt_userns, struct dentry *d,
   577				    struct xattr_ctx *ctx)
   578	{
   579		struct posix_acl *acl;
   580	
   581		if (!ctx->size || !is_posix_acl_xattr(ctx->kname->name))
   582			return 0;
   583	
   584		/* TODO: Don't use GFP_NOFS to allocate POSIX ACLs. */
 > 585		acl = posix_acl_from_xattr(current_user_ns(), ctx->kvalue, ctx->size);
   586		if (IS_ERR(acl))
   587			return PTR_ERR(acl);
   588	
   589		ctx->acl = acl;
   590		return 0;
   591	}
   592	

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