WARNING: function definition argument 'const struct xt_mtchk_param *' should also have an identifier name
#48: FILE: include/linux/netfilter/x_tables.h:150:
+	int (*check_hooks)(const struct xt_mtchk_param *);

WARNING: function definition argument 'const struct xt_tgchk_param *' should also have an identifier name
#58: FILE: include/linux/netfilter/x_tables.h:194:
+	int (*check_hooks)(const struct xt_tgchk_param *);

CHECK: Comparison to NULL could be written "par->match->check_hooks"
#117: FILE: net/netfilter/x_tables.c:553:
+	if (par->match->check_hooks != NULL)

CHECK: Comparison to NULL could be written "par->target->check_hooks"
#166: FILE: net/netfilter/x_tables.c:1100:
+	if (par->target->check_hooks != NULL)

WARNING: line length of 98 exceeds 80 columns
#314: FILE: net/netfilter/xt_addrtype.c:183:
+	const char *errmsg = "both incoming and outgoing interface limitation cannot be selected";

CHECK: spaces preferred around that '|' (ctx:VxV)
#473: FILE: net/netfilter/xt_policy.c:156:
+	if (!(info->flags & (XT_POLICY_MATCH_IN|XT_POLICY_MATCH_OUT)))
 	                                       ^

total: 0 errors, 3 warnings, 3 checks, 463 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 e633ec7ed4f0 ("netfilter: x_tables: add .check_hooks to matches and targets") 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, 3 warnings, 3 checks, 463 lines checked