linux-kernel - [RFC PATCH 4/4] tracing/timer: use __print

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Message-ID: <20230921105129.e76b17c18447.I5e112e423a69704fa05db74a05a6ebaad45d4f6e@changeid>
Date:   Thu, 21 Sep 2023 10:51:34 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-kernel@...r.kernel.org
Cc:     linux-trace-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Johannes Berg <johannes.berg@...el.com>
Subject: [RFC PATCH 4/4] tracing/timer: use __print_sym()

From: Johannes Berg <johannes.berg@...el.com>

Use the new __print_sym() in the timer tracing, just to show
how to convert something. This adds ~80 bytes of .text for a
saving of ~1.5K of data in my builds.

Note the format changes from

print fmt: "success=%d dependency=%s", REC->success, __print_symbolic(REC->dependency, { 0, "NONE" }, { (1 << 0), "POSIX_TIMER" }, { (1 << 1), "PERF_EVENTS" }, { (1 << 2), "SCHED" }, { (1 << 3), "CLOCK_UNSTABLE" }, { (1 << 4), "RCU" }, { (1 << 5), "RCU_EXP" })

to

print fmt: "success=%d dependency=%s", REC->success, __print_symbolic(REC->dependency, { 0, "NONE" }, { 1, "POSIX_TIMER" }, { 2, "PERF_EVENTS" }, { 4, "SCHED" }, { 8, "CLOCK_UNSTABLE" }, { 16, "RCU" }, { 32, "RCU_EXP" })

Since the values are now just printed in the show function as
pure decimal values.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 include/trace/events/timer.h | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index b4bc2828fa09..cb8294da29d0 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -382,26 +382,18 @@ TRACE_EVENT(itimer_expire,
 #undef tick_dep_mask_name
 #undef tick_dep_name_end
 
-/* The MASK will convert to their bits and they need to be processed too */
-#define tick_dep_name(sdep) TRACE_DEFINE_ENUM(TICK_DEP_BIT_##sdep); \
-	TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
-#define tick_dep_name_end(sdep)  TRACE_DEFINE_ENUM(TICK_DEP_BIT_##sdep); \
-	TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
-/* NONE only has a mask defined for it */
-#define tick_dep_mask_name(sdep) TRACE_DEFINE_ENUM(TICK_DEP_MASK_##sdep);
-
-TICK_DEP_NAMES
-
-#undef tick_dep_name
-#undef tick_dep_mask_name
-#undef tick_dep_name_end
-
 #define tick_dep_name(sdep) { TICK_DEP_MASK_##sdep, #sdep },
 #define tick_dep_mask_name(sdep) { TICK_DEP_MASK_##sdep, #sdep },
 #define tick_dep_name_end(sdep) { TICK_DEP_MASK_##sdep, #sdep }
 
+TRACE_DEFINE_SYM_LIST(tick_dep_names, TICK_DEP_NAMES);
+
+#undef tick_dep_name
+#undef tick_dep_mask_name
+#undef tick_dep_name_end
+
 #define show_tick_dep_name(val)				\
-	__print_symbolic(val, TICK_DEP_NAMES)
+	__print_sym(val, tick_dep_names)
 
 TRACE_EVENT(tick_stop,
 
-- 
2.41.0