Hi Herbert,

[auto build test ERROR on net/master]
[also build test ERROR on v4.4 next-20160122]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Herbert-Xu/crypto-Use-skcipher-and-ahash-shash-where-possible/20160124-212323
config: x86_64-randconfig-x014-201604 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/md/dm-crypt.c: In function 'crypt_iv_essiv_init':

quoted

drivers/md/dm-crypt.c:278:2: error: implicit declaration of function 'ahash_request_zero' [-Werror=implicit-function-declaration]

     ahash_request_zero(req);
     ^
   cc1: some warnings being treated as errors

vim +/ahash_request_zero +278 drivers/md/dm-crypt.c

   272		sg_init_one(&sg, cc->key, cc->key_size);
   273		ahash_request_set_tfm(req, essiv->hash_tfm);
   274		ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP, NULL, NULL);
   275		ahash_request_set_crypt(req, &sg, essiv->salt, cc->key_size);
   276	
   277		err = crypto_ahash_digest(req);
 > 278		ahash_request_zero(req);
   279		if (err)
   280			return err;
   281	

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