fs/gfs2/log.c:717: undefined reference to `crc32c'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   255442c93843f52b6891b21d0b485bf2c97f93c3
commit: c1696fb85d33194cf65c7ebfc82a75696299c3a3 GFS2: Introduce new gfs2_log_header_v2
date:   9 days ago
config: x86_64-randconfig-a0-02011154 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        git checkout c1696fb85d33194cf65c7ebfc82a75696299c3a3
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/gfs2/log.o: In function `gfs2_write_log_header':
>> fs/gfs2/log.c:717: undefined reference to `crc32c'
   fs/gfs2/recovery.o: In function `get_log_header':
>> fs/gfs2/recovery.c:152: undefined reference to `crc32c'

vim +717 fs/gfs2/log.c

   653	
   654	/**
   655	 * write_log_header - Write a journal log header buffer at sd_log_flush_head
   656	 * @sdp: The GFS2 superblock
   657	 * @jd: journal descriptor of the journal to which we are writing
   658	 * @seq: sequence number
   659	 * @tail: tail of the log
   660	 * @flags: log header flags GFS2_LOG_HEAD_*
   661	 * @op_flags: flags to pass to the bio
   662	 *
   663	 * Returns: the initialized log buffer descriptor
   664	 */
   665	
   666	void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
   667				   u64 seq, u32 tail, u32 flags, int op_flags)
   668	{
   669		struct gfs2_log_header *lh;
   670		u32 hash, crc;
   671		struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
   672		struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
   673		struct timespec64 tv;
   674		struct super_block *sb = sdp->sd_vfs;
   675		u64 addr;
   676	
   677		lh = page_address(page);
   678		clear_page(lh);
   679	
   680		lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
   681		lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
   682		lh->lh_header.__pad0 = cpu_to_be64(0);
   683		lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
   684		lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
   685		lh->lh_sequence = cpu_to_be64(seq);
   686		lh->lh_flags = cpu_to_be32(flags);
   687		lh->lh_tail = cpu_to_be32(tail);
   688		lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
   689		hash = ~crc32(~0, lh, LH_V1_SIZE);
   690		lh->lh_hash = cpu_to_be32(hash);
   691	
   692		tv = current_kernel_time64();
   693		lh->lh_nsec = cpu_to_be32(tv.tv_nsec);
   694		lh->lh_sec = cpu_to_be64(tv.tv_sec);
   695		addr = gfs2_log_bmap(sdp);
   696		lh->lh_addr = cpu_to_be64(addr);
   697		lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr);
   698	
   699		/* We may only write local statfs, quota, etc., when writing to our
   700		   own journal. The values are left 0 when recovering a journal
   701		   different from our own. */
   702		if (!(flags & GFS2_LOG_HEAD_RECOVERY)) {
   703			lh->lh_statfs_addr =
   704				cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr);
   705			lh->lh_quota_addr =
   706				cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr);
   707	
   708			spin_lock(&sdp->sd_statfs_spin);
   709			lh->lh_local_total = cpu_to_be64(l_sc->sc_total);
   710			lh->lh_local_free = cpu_to_be64(l_sc->sc_free);
   711			lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes);
   712			spin_unlock(&sdp->sd_statfs_spin);
   713		}
   714	
   715		BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE);
   716	
 > 717		crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
   718			     sb->s_blocksize - LH_V1_SIZE - 4);
   719		lh->lh_crc = cpu_to_be32(crc);
   720	
   721		gfs2_log_write(sdp, page, sb->s_blocksize, 0, addr);
   722		gfs2_log_flush_bio(sdp, REQ_OP_WRITE, op_flags);
   723		log_flush_wait(sdp);
   724	}
   725	

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