Hi Changbin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v4.17 next-20180605] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/changbin-du-intel-com/kernel-hacking-GCC-optimization-for-better-debug-experience-Og/20180606-001415 config: ia64-allmodconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 8.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=ia64 All warnings (new ones prefixed by >>): drivers//staging/greybus/fw-management.c: In function 'fw_mgmt_load_and_validate_operation': >> drivers//staging/greybus/fw-management.c:153:2: warning: 'strncpy' specified bound 10 equals destination size [-Wstringop-truncation] strncpy(request.firmware_tag, tag, GB_FIRMWARE_TAG_MAX_SIZE); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers//staging/greybus/fw-management.c: In function 'fw_mgmt_backend_fw_update_operation': drivers//staging/greybus/fw-management.c:304:2: warning: 'strncpy' specified bound 10 equals destination size [-Wstringop-truncation] strncpy(request.firmware_tag, tag, GB_FIRMWARE_TAG_MAX_SIZE); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/auxdisplay/panel.c: In function 'panel_bind_key': >> drivers/auxdisplay/panel.c:1509:2: warning: 'strncpy' specified bound 12 equals destination size [-Wstringop-truncation] strncpy(key->u.kbd.press_str, press, sizeof(key->u.kbd.press_str)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/auxdisplay/panel.c:1510:2: warning: 'strncpy' specified bound 12 equals destination size [-Wstringop-truncation] strncpy(key->u.kbd.repeat_str, repeat, sizeof(key->u.kbd.repeat_str)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strncpy +153 drivers//staging/greybus/fw-management.c 013e6653 Viresh Kumar 2016-05-14 138 013e6653 Viresh Kumar 2016-05-14 139 static int fw_mgmt_load_and_validate_operation(struct fw_mgmt *fw_mgmt, 013e6653 Viresh Kumar 2016-05-14 140 u8 load_method, const char *tag) 013e6653 Viresh Kumar 2016-05-14 141 { 013e6653 Viresh Kumar 2016-05-14 142 struct gb_fw_mgmt_load_and_validate_fw_request request; 013e6653 Viresh Kumar 2016-05-14 143 int ret; 013e6653 Viresh Kumar 2016-05-14 144 013e6653 Viresh Kumar 2016-05-14 145 if (load_method != GB_FW_LOAD_METHOD_UNIPRO && 013e6653 Viresh Kumar 2016-05-14 146 load_method != GB_FW_LOAD_METHOD_INTERNAL) { 013e6653 Viresh Kumar 2016-05-14 147 dev_err(fw_mgmt->parent, 013e6653 Viresh Kumar 2016-05-14 148 "invalid load-method (%d)\n", load_method); 013e6653 Viresh Kumar 2016-05-14 149 return -EINVAL; 013e6653 Viresh Kumar 2016-05-14 150 } 013e6653 Viresh Kumar 2016-05-14 151 013e6653 Viresh Kumar 2016-05-14 152 request.load_method = load_method; b2abeaa1 Viresh Kumar 2016-08-11 @153 strncpy(request.firmware_tag, tag, GB_FIRMWARE_TAG_MAX_SIZE); 013e6653 Viresh Kumar 2016-05-14 154 013e6653 Viresh Kumar 2016-05-14 155 /* 013e6653 Viresh Kumar 2016-05-14 156 * The firmware-tag should be NULL terminated, otherwise throw error and 013e6653 Viresh Kumar 2016-05-14 157 * fail. 013e6653 Viresh Kumar 2016-05-14 158 */ b2abeaa1 Viresh Kumar 2016-08-11 159 if (request.firmware_tag[GB_FIRMWARE_TAG_MAX_SIZE - 1] != '\0') { 013e6653 Viresh Kumar 2016-05-14 160 dev_err(fw_mgmt->parent, "load-and-validate: firmware-tag is not NULL terminated\n"); 013e6653 Viresh Kumar 2016-05-14 161 return -EINVAL; 013e6653 Viresh Kumar 2016-05-14 162 } 013e6653 Viresh Kumar 2016-05-14 163 013e6653 Viresh Kumar 2016-05-14 164 /* Allocate ids from 1 to 255 (u8-max), 0 is an invalid id */ 013e6653 Viresh Kumar 2016-05-14 165 ret = ida_simple_get(&fw_mgmt->id_map, 1, 256, GFP_KERNEL); 013e6653 Viresh Kumar 2016-05-14 166 if (ret < 0) { 013e6653 Viresh Kumar 2016-05-14 167 dev_err(fw_mgmt->parent, "failed to allocate request id (%d)\n", 013e6653 Viresh Kumar 2016-05-14 168 ret); 013e6653 Viresh Kumar 2016-05-14 169 return ret; 013e6653 Viresh Kumar 2016-05-14 170 } 013e6653 Viresh Kumar 2016-05-14 171 013e6653 Viresh Kumar 2016-05-14 172 fw_mgmt->intf_fw_request_id = ret; 04f0e6eb Viresh Kumar 2016-05-14 173 fw_mgmt->intf_fw_loaded = false; 013e6653 Viresh Kumar 2016-05-14 174 request.request_id = ret; 013e6653 Viresh Kumar 2016-05-14 175 013e6653 Viresh Kumar 2016-05-14 176 ret = gb_operation_sync(fw_mgmt->connection, 013e6653 Viresh Kumar 2016-05-14 177 GB_FW_MGMT_TYPE_LOAD_AND_VALIDATE_FW, &request, 013e6653 Viresh Kumar 2016-05-14 178 sizeof(request), NULL, 0); 013e6653 Viresh Kumar 2016-05-14 179 if (ret) { 013e6653 Viresh Kumar 2016-05-14 180 ida_simple_remove(&fw_mgmt->id_map, 013e6653 Viresh Kumar 2016-05-14 181 fw_mgmt->intf_fw_request_id); 013e6653 Viresh Kumar 2016-05-14 182 fw_mgmt->intf_fw_request_id = 0; 013e6653 Viresh Kumar 2016-05-14 183 dev_err(fw_mgmt->parent, 013e6653 Viresh Kumar 2016-05-14 184 "load and validate firmware request failed (%d)\n", 013e6653 Viresh Kumar 2016-05-14 185 ret); 013e6653 Viresh Kumar 2016-05-14 186 return ret; 013e6653 Viresh Kumar 2016-05-14 187 } 013e6653 Viresh Kumar 2016-05-14 188 013e6653 Viresh Kumar 2016-05-14 189 return 0; 013e6653 Viresh Kumar 2016-05-14 190 } 013e6653 Viresh Kumar 2016-05-14 191 :::::: The code at line 153 was first introduced by commit :::::: b2abeaa10d5711e7730bb07120dd60ae27d7b930 greybus: firmware: s/_LEN/_SIZE :::::: TO: Viresh Kumar <viresh.kumar@xxxxxxxxxx> :::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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