linux-kernel - [PATCH v3 07/22] dyndbg: repack

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Date: Sat, 23 Dec 2023 02:51:16 +0100
From: Łukasz Bartosik <lb@...ihalf.com>
To: Jason Baron <jbaron@...mai.com>,
	Jim Cromie <jim.cromie@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Douglas Anderson <dianders@...omium.org>
Cc: Guenter Roeck <groeck@...gle.com>,
	Yaniv Tzoreff <yanivt@...gle.com>,
	Benson Leung <bleung@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Vincent Whitchurch <vincent.whitchurch@...s.com>,
	Pekka Paalanen <ppaalanen@...il.com>,
	Sean Paul <seanpaul@...omium.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Simon Ser <contact@...rsion.fr>,
	John Ogness <john.ogness@...utronix.de>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org,
	upstream@...ihalf.com
Subject: [PATCH v3 07/22] dyndbg: repack _ddebug structure

From: Jim Cromie <jim.cromie@...il.com>

Move the JUMP_LABEL to the top of the struct, since they're both
align(8) and this closes a pahole (unfortunately trading for padding,
but still).

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 include/linux/dynamic_debug.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 497130816e9c..b9237e4ecd1b 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -14,6 +14,12 @@
  * the special section is treated as an array of these.
  */
 struct _ddebug {
+#ifdef CONFIG_JUMP_LABEL
+	union {
+		struct static_key_true dd_key_true;
+		struct static_key_false dd_key_false;
+	} key;
+#endif
 	/*
 	 * These fields are used to drive the user interface
 	 * for selecting and displaying debug callsites.
@@ -53,12 +59,6 @@ struct _ddebug {
 #define _DPRINTK_FLAGS_DEFAULT 0
 #endif
 	unsigned int flags:8;
-#ifdef CONFIG_JUMP_LABEL
-	union {
-		struct static_key_true dd_key_true;
-		struct static_key_false dd_key_false;
-	} key;
-#endif
 } __attribute__((aligned(8)));
 
 enum class_map_type {
-- 
2.43.0.472.g3155946c3a-goog