Re: [PATCH v8 04/16] s390/zcrypt: driver callback to indicate resource in use

kernel test robot
2020-06-06T01:35:30Z

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Hi Tony,

I love your patch! Perhaps something to improve:

[auto build test WARNING on kvms390/next]
[also build test WARNING on linus/master v5.7]
[cannot apply to s390/features linux/master next-20200605]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20200606-054350
base: https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git next
config: s390-allyesconfig (attached as .config)
compiler: s390-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
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390

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 >>, old ones prefixed by <<):

drivers/s390/crypto/ap_bus.c: In function '__ap_revise_reserved':
drivers/s390/crypto/ap_bus.c:594:6: warning: variable 'rc' set but not used [-Wunused-but-set-variable]
594 | int rc, card, queue, devres, drvres;
| ^~
drivers/s390/crypto/ap_bus.c: At top level:
>> drivers/s390/crypto/ap_bus.c:1106:5: warning: no previous prototype for '__verify_card_reservations' [-Wmissing-prototypes]
1106 | int __verify_card_reservations(struct device_driver *drv, void *data)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/s390/crypto/ap_bus.c:1195:5: warning: no previous prototype for '__verify_queue_reservations' [-Wmissing-prototypes]
1195 | int __verify_queue_reservations(struct device_driver *drv, void *data)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/__verify_card_reservations +1106 drivers/s390/crypto/ap_bus.c

1105
> 1106 int __verify_card_reservations(struct device_driver *drv, void *data)
1107 {
1108 int rc = 0;
1109 struct ap_driver *ap_drv = to_ap_drv(drv);
1110 unsigned long *newapm = (unsigned long *)data;
1111
1112 /*
1113 * No need to verify whether the driver is using the queues if it is the
1114 * default driver.
1115 */
1116 if (ap_drv->flags & AP_DRIVER_FLAG_DEFAULT)
1117 return 0;
1118
1119 /* The non-default driver's module must be loaded */
1120 if (!try_module_get(drv->owner))
1121 return 0;
1122
1123 if (ap_drv->in_use)
1124 if (ap_drv->in_use(newapm, ap_perms.aqm))
1125 rc = -EADDRINUSE;
1126
1127 module_put(drv->owner);
1128
1129 return rc;
1130 }
1131
1132 static int apmask_commit(unsigned long *newapm)
1133 {
1134 int rc;
1135 unsigned long reserved[BITS_TO_LONGS(AP_DEVICES)];
1136
1137 /*
1138 * Check if any bits in the apmask have been set which will
1139 * result in queues being removed from non-default drivers
1140 */
1141 if (bitmap_andnot(reserved, newapm, ap_perms.apm, AP_DEVICES)) {
1142 rc = bus_for_each_drv(&ap_bus_type, NULL, reserved,
1143 __verify_card_reservations);
1144 if (rc)
1145 return rc;
1146 }
1147
1148 memcpy(ap_perms.apm, newapm, APMASKSIZE);
1149
1150 return 0;
1151 }
1152
1153 static ssize_t apmask_store(struct bus_type *bus, const char *buf,
1154 size_t count)
1155 {
1156 int rc;
1157 DECLARE_BITMAP(newapm, AP_DEVICES);
1158
1159 if (mutex_lock_interruptible(&ap_perms_mutex))
1160 return -ERESTARTSYS;
1161
1162 rc = ap_parse_bitmap_str(buf, ap_perms.apm, AP_DEVICES, newapm);
1163 if (rc)
1164 goto done;
1165
1166 rc = apmask_commit(newapm);
1167
1168 done:
1169 mutex_unlock(&ap_perms_mutex);
1170 if (rc)
1171 return rc;
1172
1173 ap_bus_revise_bindings();
1174
1175 return count;
1176 }
1177
1178 static BUS_ATTR_RW(apmask);
1179
1180 static ssize_t aqmask_show(struct bus_type *bus, char *buf)
1181 {
1182 int rc;
1183
1184 if (mutex_lock_interruptible(&ap_perms_mutex))
1185 return -ERESTARTSYS;
1186 rc = scnprintf(buf, PAGE_SIZE,
1187 "0x%016lx%016lx%016lx%016lx\n",
1188 ap_perms.aqm[0], ap_perms.aqm[1],
1189 ap_perms.aqm[2], ap_perms.aqm[3]);
1190 mutex_unlock(&ap_perms_mutex);
1191
1192 return rc;
1193 }
1194
> 1195 int __verify_queue_reservations(struct device_driver *drv, void *data)
1196 {
1197 int rc = 0;
1198 struct ap_driver *ap_drv = to_ap_drv(drv);
1199 unsigned long *newaqm = (unsigned long *)data;
1200
1201 /*
1202 * If the reserved bits do not identify queues reserved for use by the
1203 * non-default driver, there is no need to verify the driver is using
1204 * the queues.
1205 */
1206 if (ap_drv->flags & AP_DRIVER_FLAG_DEFAULT)
1207 return 0;
1208
1209 /* The non-default driver's module must be loaded */
1210 if (!try_module_get(drv->owner))
1211 return 0;
1212
1213 if (ap_drv->in_use)
1214 if (ap_drv->in_use(ap_perms.apm, newaqm))
1215 rc = -EADDRINUSE;
1216
1217 module_put(drv->owner);
1218
1219 return rc;
1220 }
1221

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

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