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Subject[hare-scsi-devel:auth.v2 7/12] drivers/nvme/target/../target/nvmet.h:728:1: warning: type qualifiers ignored on function return type
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git auth.v2
head: 9107ea4a3526c6801b38b7a2345b7372278a35ba
commit: ca7a6b4cc19e4383ec693c75bb5c6f678b692a14 [7/12] nvmet: Implement basic In-Band Authentication
config: parisc-randconfig-r011-20210712 (attached as .config)
compiler: hppa64-linux-gcc (GCC) 9.3.0
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/hare/scsi-devel.git/commit/?id=ca7a6b4cc19e4383ec693c75bb5c6f678b692a14
git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git
git fetch --no-tags hare-scsi-devel auth.v2
git checkout ca7a6b4cc19e4383ec693c75bb5c6f678b692a14
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc

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

All warnings (new ones prefixed by >>):

In file included from drivers/nvme/target/fcloop.c:11:
>> drivers/nvme/target/../target/nvmet.h:728:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
728 | const char nvmet_dhchap_dhgroup_name(int dhgid) { return NULL; }
| ^~~~~
>> drivers/nvme/target/../target/nvmet.h:728:12: warning: no previous prototype for 'nvmet_dhchap_dhgroup_name' [-Wmissing-prototypes]
728 | const char nvmet_dhchap_dhgroup_name(int dhgid) { return NULL; }
| ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/uapi/linux/posix_types.h:5,
from include/uapi/linux/types.h:14,
from include/linux/types.h:6,
from include/linux/list.h:5,
from include/linux/module.h:12,
from drivers/nvme/target/fcloop.c:6:
drivers/nvme/target/../target/nvmet.h: In function 'nvmet_dhchap_dhgroup_name':
include/linux/stddef.h:8:14: warning: returning 'void *' from a function with return type 'char' makes integer from pointer without a cast [-Wint-conversion]
8 | #define NULL ((void *)0)
| ^
drivers/nvme/target/../target/nvmet.h:728:58: note: in expansion of macro 'NULL'
728 | const char nvmet_dhchap_dhgroup_name(int dhgid) { return NULL; }
| ^~~~


vim +728 drivers/nvme/target/../target/nvmet.h

687
688 #ifdef CONFIG_NVME_TARGET_AUTH
689 void nvmet_execute_auth_send(struct nvmet_req *req);
690 void nvmet_execute_auth_receive(struct nvmet_req *req);
691 int nvmet_auth_set_host_key(struct nvmet_host *host, const char *secret);
692 int nvmet_auth_set_host_hash(struct nvmet_host *host, const char *hash);
693 int nvmet_auth_get_hash(struct nvmet_ctrl *ctrl, unsigned int *hash_len);
694 const char *nvmet_auth_hmac_name(int hmac_id);
695 int nvmet_auth_set_host_dhgroup(struct nvmet_host *host, const char *hash);
696 const char *nvmet_auth_get_host_dhgroup(struct nvmet_host *host);
697 int nvmet_setup_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req);
698 void nvmet_reset_auth(struct nvmet_ctrl *ctrl);
699 int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, int dhgroup_id);
700 bool nvmet_check_auth_status(struct nvmet_req *req);
701 int nvmet_auth_host_hash(struct nvmet_req *req, u8 *response,
702 unsigned int hash_len);
703 int nvmet_auth_ctrl_hash(struct nvmet_req *req, u8 *response,
704 unsigned int hash_len);
705 static inline bool nvmet_has_auth(struct nvmet_ctrl *ctrl)
706 {
707 return ctrl->shash_tfm != NULL;
708 }
709 const char *nvmet_dhchap_dhgroup_name(int dhgid);
710 int nvmet_auth_ctrl_exponential(struct nvmet_req *req,
711 u8 *buf, int buf_size);
712 int nvmet_auth_ctrl_sesskey(struct nvmet_req *req,
713 u8 *buf, int buf_size);
714 #else
715 static inline int nvmet_setup_auth(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
716 {
717 return 0;
718 }
719 static inline void nvmet_reset_auth(struct nvmet_ctrl *ctrl) {};
720 static inline bool nvmet_check_auth_status(struct nvmet_req *req)
721 {
722 return true;
723 }
724 static inline bool nvmet_has_auth(struct nvmet_ctrl *ctrl)
725 {
726 return false;
727 }
> 728 const char nvmet_dhchap_dhgroup_name(int dhgid) { return NULL; }
729 #endif
730

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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