WARNING: line length of 86 exceeds 80 columns
#126: FILE: tools/testing/selftests/net/forwarding/ipmr.c:74:
+static int nl_sendmsg_mfc(struct __test_metadata *_metadata, FIXTURE_DATA(ipmr) *self,

CHECK: spaces preferred around that '*' (ctx:WxV)
#126: FILE: tools/testing/selftests/net/forwarding/ipmr.c:74:
+static int nl_sendmsg_mfc(struct __test_metadata *_metadata, FIXTURE_DATA(ipmr) *self,
                                                                                 ^

WARNING: line length of 86 exceeds 80 columns
#135: FILE: tools/testing/selftests/net/forwarding/ipmr.c:83:
+			/* ipmr does not care about NLM_F_CREATE and NLM_F_EXCL ... */

WARNING: line length of 94 exceeds 80 columns
#155: FILE: tools/testing/selftests/net/forwarding/ipmr.c:103:
+	rta = nl_add_rtattr(nlmsg, rta, RTA_TABLE, &mfc_attr->table, sizeof(mfc_attr->table));

WARNING: line length of 94 exceeds 80 columns
#156: FILE: tools/testing/selftests/net/forwarding/ipmr.c:104:
+	rta = nl_add_rtattr(nlmsg, rta, RTA_SRC, &mfc_attr->origin, sizeof(mfc_attr->origin));

WARNING: line length of 92 exceeds 80 columns
#157: FILE: tools/testing/selftests/net/forwarding/ipmr.c:105:
+	rta = nl_add_rtattr(nlmsg, rta, RTA_DST, &mfc_attr->group, sizeof(mfc_attr->group));

WARNING: line length of 104 exceeds 80 columns
#159: FILE: tools/testing/selftests/net/forwarding/ipmr.c:107:
+		rta = nl_add_rtattr(nlmsg, rta, RTA_IIF, &mfc_attr->ifindex, sizeof(mfc_attr->ifindex));

WARNING: line length of 84 exceeds 80 columns
#209: FILE: tools/testing/selftests/net/forwarding/ipmr.c:157:
+	int err, val = 0;  /* any value is ok, but size must be int for MRT_INIT. */

WARNING: line length of 90 exceeds 80 columns
#295: FILE: tools/testing/selftests/net/forwarding/ipmr.c:243:
+	/* MRT_ADD_MFC / MRT_ADD_MFC_PROXY does not need vif to exist (unlike netlink). */

WARNING: line length of 81 exceeds 80 columns
#302: FILE: tools/testing/selftests/net/forwarding/ipmr.c:250:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 85 exceeds 80 columns
#316: FILE: tools/testing/selftests/net/forwarding/ipmr.c:264:
+			 variant->level, variant->opts[MRT_ADD_MFC_PROXY - MRT_BASE],

WARNING: line length of 81 exceeds 80 columns
#320: FILE: tools/testing/selftests/net/forwarding/ipmr.c:268:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 85 exceeds 80 columns
#324: FILE: tools/testing/selftests/net/forwarding/ipmr.c:272:
+			 variant->level, variant->opts[MRT_DEL_MFC_PROXY - MRT_BASE],

WARNING: line length of 81 exceeds 80 columns
#352: FILE: tools/testing/selftests/net/forwarding/ipmr.c:300:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 81 exceeds 80 columns
#383: FILE: tools/testing/selftests/net/forwarding/ipmr.c:331:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 87 exceeds 80 columns
#436: FILE: tools/testing/selftests/net/forwarding/ipmr.c:384:
+				 variant->level, variant->opts[MRT_ADD_VIF - MRT_BASE],

WARNING: line length of 81 exceeds 80 columns
#445: FILE: tools/testing/selftests/net/forwarding/ipmr.c:393:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 81 exceeds 80 columns
#453: FILE: tools/testing/selftests/net/forwarding/ipmr.c:401:
+	err = system("cat /proc/net/ip_mr_cache | grep -q '00000000 00000000' ");

WARNING: line length of 88 exceeds 80 columns
#462: FILE: tools/testing/selftests/net/forwarding/ipmr.c:410:
+	/* It can be removed by setsockopt(), but let cleanup_net() remove this time. */

total: 0 errors, 18 warnings, 1 checks, 465 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 1a09168aa263 ("selftest: net: Add basic functionality tests for ipmr.") 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, 18 warnings, 1 checks, 465 lines checked