ERROR: Macros with complex values should be enclosed in parentheses
#127: FILE: include/net/dropreason-qdisc.h:7:
+#define DEFINE_QDISC_DROP_REASON(FN, FNe)	\
+	FN(UNSPEC)			\
+	FN(GENERIC)			\
+	FN(OVERLIMIT)			\
+	FN(CONGESTED)			\
+	FN(CAKE_FLOOD)			\
+	FN(FQ_BAND_LIMIT)		\
+	FN(FQ_HORIZON_LIMIT)		\
+	FN(FQ_FLOW_LIMIT)		\
+	FNe(MAX)

BUT SEE:

   do {} while (0) advice is over-stated in a few situations:

   The more obvious case is macros, like MODULE_PARM_DESC, invoked at
   file-scope, where C disallows code (it must be in functions).  See
   $exceptions if you have one to add by name.

   More troublesome is declarative macros used at top of new scope,
   like DECLARE_PER_CPU.  These might just compile with a do-while-0
   wrapper, but would be incorrect.  Most of these are handled by
   detecting struct,union,etc declaration primitives in $exceptions.

   Theres also macros called inside an if (block), which "return" an
   expression.  These cannot do-while, and need a ({}) wrapper.

   Enjoy this qualification while we work to improve our heuristics.

WARNING: line length of 87 exceeds 80 columns
#155: FILE: include/net/dropreason-qdisc.h:35:
+	 * Value 0 serves as analogous to SKB_NOT_DROPPED_YET for enum skb_drop_reason.

WARNING: macros should not use a trailing semicolon
#336: FILE: include/trace/events/qdisc.h:79:
+#define FN(reason)	TRACE_DEFINE_ENUM(QDISC_DROP_##reason);

WARNING: macros should not use a trailing semicolon
#337: FILE: include/trace/events/qdisc.h:80:
+#define FNe(reason)	TRACE_DEFINE_ENUM(QDISC_DROP_##reason);

CHECK: Alignment should match open parenthesis
#346: FILE: include/trace/events/qdisc.h:89:
+TRACE_EVENT(qdisc_drop,
+

CHECK: Lines should not end with a '('
#353: FILE: include/trace/events/qdisc.h:96:
+	TP_STRUCT__entry(

CHECK: Lines should not end with a '('
#364: FILE: include/trace/events/qdisc.h:107:
+	TP_fast_assign(

WARNING: line length of 82 exceeds 80 columns
#532: FILE: net/sched/sch_dualpi2.c:396:
+		return qdisc_drop_reason(skb, sch, to_free, QDISC_DROP_OVERLIMIT);

WARNING: line length of 84 exceeds 80 columns
#661: FILE: net/sched/sch_generic.c:53:
+		if ((reason & SKB_DROP_REASON_SUBSYS_MASK) == __QDISC_DROP_REASON) {

WARNING: line length of 91 exceeds 80 columns
#662: FILE: net/sched/sch_generic.c:54:
+			trace_qdisc_drop(q, txq, dev, skb, (enum qdisc_drop_reason)reason);

total: 1 errors, 6 warnings, 3 checks, 612 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 44d10146e4e6 ("net: sched: introduce qdisc-specific drop reason tracing") 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.