WARNING: please write a help paragraph that fully describes the config symbol with at least 4 lines
#26: FILE: drivers/i2c/Kconfig:137:
+config I2C_TARGET_ARP
+	tristate "SMBus ARP target mode test driver"
+	help
+	  This backend makes Linux respond to SMBus Address Resolution Protocol
+	  commands.
+

WARNING: line length of 92 exceeds 80 columns
#113: FILE: drivers/i2c/i2c-target-arp.c:62:
+static int i2c_target_arp_cb(struct i2c_client *target, enum i2c_slave_event event, u8 *val)

WARNING: line length of 81 exceeds 80 columns
#115: FILE: drivers/i2c/i2c-target-arp.c:64:
+	struct arp_target *arp = container_of(target, struct arp_target, target);

WARNING: line length of 91 exceeds 80 columns
#142: FILE: drivers/i2c/i2c-target-arp.c:91:
+			if (!memcmp(&arp->buf[2], &arp->data.udid, sizeof(arp->data.udid)))

WARNING: line length of 85 exceeds 80 columns
#143: FILE: drivers/i2c/i2c-target-arp.c:92:
+				arp->flag = ARP_ADDRESS_VALID | ARP_ADDRESS_RESOLVED;

WARNING: line length of 86 exceeds 80 columns
#177: FILE: drivers/i2c/i2c-target-arp.c:126:
+		dev_warn(&client->dev, "Failed to Notify ARP Controller (%d)\n", ret);

total: 0 errors, 6 warnings, 0 checks, 219 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 49eb8b547f18 ("i2c: Add SMBus ARP target mode test driver") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 6 warnings, 0 checks, 219 lines checked