linux-kernel - [PATCH v2 3/4] tracing: Use ? : shortcut in trace macros

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Date: Thu, 22 Feb 2024 16:14:18 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Ville Syrjälä <ville.syrjala@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v2 3/4] tracing: Use ? : shortcut in trace macros

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

Instead of having:

  #define __assign_str(dst, src)					\
	memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ?		\
		__data_offsets.dst##_ptr_ : "(null)",			\
		__get_dynamic_array_len(dst))

Use the ? : shortcut and compact it down to:

  #define __assign_str(dst, src)					\
	memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ? : "(null)",	\
	       __get_dynamic_array_len(dst))

Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/trace/stages/stage5_get_offsets.h    |  4 ++--
 include/trace/stages/stage6_event_callback.h | 14 ++++++--------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/include/trace/stages/stage5_get_offsets.h b/include/trace/stages/stage5_get_offsets.h
index 45f8151cf622..20b801ed3fd4 100644
--- a/include/trace/stages/stage5_get_offsets.h
+++ b/include/trace/stages/stage5_get_offsets.h
@@ -47,7 +47,7 @@
 
 #undef __string
 #define __string(item, src) __dynamic_array(char, item,			\
-		    strlen((src) ? (const char *)(src) : "(null)") + 1)	\
+		    strlen((const char *)(src) ? : "(null)") + 1)	\
 	__data_offsets->item##_ptr_ = src;
 
 #undef __string_len
@@ -70,7 +70,7 @@
 
 #undef __rel_string
 #define __rel_string(item, src) __rel_dynamic_array(char, item,		\
-		    strlen((src) ? (const char *)(src) : "(null)") + 1)	\
+		    strlen((const char *)(src) ? : "(null)") + 1)	\
 	__data_offsets->item##_ptr_ = src;
 
 #undef __rel_string_len
diff --git a/include/trace/stages/stage6_event_callback.h b/include/trace/stages/stage6_event_callback.h
index c0e5d097324e..38732855eadb 100644
--- a/include/trace/stages/stage6_event_callback.h
+++ b/include/trace/stages/stage6_event_callback.h
@@ -32,15 +32,14 @@
 
 #undef __assign_str
 #define __assign_str(dst, src)						\
-	memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ?		\
-	       __data_offsets.dst##_ptr_ : "(null)",			\
+	memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ? : "(null)",	\
 	       __get_dynamic_array_len(dst))
 
 #undef __assign_str_len
 #define __assign_str_len(dst, src, len)					\
 	do {								\
-		memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ?	\
-		       __data_offsets.dst##_ptr_ : "(null)", len);	\
+		memcpy(__get_str(dst),					\
+		       __data_offsets.dst##_ptr_ ? : "(null)", len);	\
 		__get_str(dst)[len] = '\0';				\
 	} while(0)
 
@@ -95,15 +94,14 @@
 
 #undef __assign_rel_str
 #define __assign_rel_str(dst, src)					\
-	memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ?		\
-	       __data_offsets.dst##_ptr_ : "(null)",			\
+	memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ? : "(null)", \
 	       __get_rel_dynamic_array_len(dst))
 
 #undef __assign_rel_str_len
 #define __assign_rel_str_len(dst, src, len)				\
 	do {								\
-		memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ?	\
-		       __data_offsets.dst##_ptr_ : "(null)", len);	\
+		memcpy(__get_rel_str(dst),				\
+		       __data_offsets.dst##_ptr_ ? : "(null)", len);	\
 		__get_rel_str(dst)[len] = '\0';				\
 	} while (0)
 
-- 
2.43.0