linux-kernel - [PATCH v8 7/7] jump_label: use defined macros instead of hard-coding for better readability

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Message-Id: <1389104234-15239-8-git-send-email-liuj97@gmail.com>
Date:	Tue,  7 Jan 2014 22:17:14 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Andrew Jones <drjones@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Cc:	Jiang Liu <liuj97@...il.com>, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v8 7/7] jump_label: use defined macros instead of hard-coding for better readability

Use macro JUMP_LABEL_TRUE_BRANCH instead of hard-coding for better
readability.

Acked-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Jason Baron <jbaron@...mai.com>
Signed-off-by: Jiang Liu <liuj97@...il.com>
---
 include/linux/jump_label.h | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 3999977..5c1dfb2 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -81,18 +81,21 @@ struct module;
 #include <linux/atomic.h>
 #ifdef HAVE_JUMP_LABEL
 
-#define JUMP_LABEL_TRUE_BRANCH 1UL
+#define JUMP_LABEL_TYPE_FALSE_BRANCH	0UL
+#define JUMP_LABEL_TYPE_TRUE_BRANCH	1UL
+#define JUMP_LABEL_TYPE_MASK		1UL
 
 static
 inline struct jump_entry *jump_label_get_entries(struct static_key *key)
 {
 	return (struct jump_entry *)((unsigned long)key->entries
-						& ~JUMP_LABEL_TRUE_BRANCH);
+						& ~JUMP_LABEL_TYPE_MASK);
 }
 
 static inline bool jump_label_get_branch_default(struct static_key *key)
 {
-	if ((unsigned long)key->entries & JUMP_LABEL_TRUE_BRANCH)
+	if (((unsigned long)key->entries & JUMP_LABEL_TYPE_MASK) ==
+	    JUMP_LABEL_TYPE_TRUE_BRANCH)
 		return true;
 	return false;
 }
@@ -122,10 +125,12 @@ extern void static_key_slow_inc(struct static_key *key);
 extern void static_key_slow_dec(struct static_key *key);
 extern void jump_label_apply_nops(struct module *mod);
 
-#define STATIC_KEY_INIT_TRUE ((struct static_key) \
-	{ .enabled = ATOMIC_INIT(1), .entries = (void *)1 })
-#define STATIC_KEY_INIT_FALSE ((struct static_key) \
-	{ .enabled = ATOMIC_INIT(0), .entries = (void *)0 })
+#define STATIC_KEY_INIT_TRUE ((struct static_key)		\
+	{ .enabled = ATOMIC_INIT(1),				\
+	  .entries = (void *)JUMP_LABEL_TYPE_TRUE_BRANCH })
+#define STATIC_KEY_INIT_FALSE ((struct static_key)		\
+	{ .enabled = ATOMIC_INIT(0),				\
+	  .entries = (void *)JUMP_LABEL_TYPE_FALSE_BRANCH })
 
 #else  /* !HAVE_JUMP_LABEL */
 
-- 
1.8.1.2

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