linux-kernel - [PATCH] kernel/kprobes.c: move cleanup_rp_inst() to where CONFIG

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Date:	Sat, 01 Feb 2014 20:17:28 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	ananth@...ibm.com, anil.s.keshavamurthy@...el.com,
	masami.hiramatsu.pt@...achi.com
CC:	hskinnemoen@...il.com, David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	egtvedt@...fundet.no
Subject: [PATCH] kernel/kprobes.c: move cleanup_rp_inst() to where CONFIG_KRETPROBES
 enabled

When CONFIG_KRETPROBES disabled, cleanup_rp_inst() is useless too. It
is only called by unregister_kretprobes() which is in CONFIG_KRETPROBES
enabled area.

The related warning (allmodconfig under avr32):

  kernel/kprobes.c:1181: warning: 'cleanup_rp_inst' defined but not used


Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 kernel/kprobes.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index ceeadfc..18a520d 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1178,26 +1178,6 @@ static inline void free_rp_inst(struct kretprobe *rp)
 	}
 }
 
-static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
-{
-	unsigned long flags, hash;
-	struct kretprobe_instance *ri;
-	struct hlist_node *next;
-	struct hlist_head *head;
-
-	/* No race here */
-	for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) {
-		kretprobe_table_lock(hash, &flags);
-		head = &kretprobe_inst_table[hash];
-		hlist_for_each_entry_safe(ri, next, head, hlist) {
-			if (ri->rp == rp)
-				ri->rp = NULL;
-		}
-		kretprobe_table_unlock(hash, &flags);
-	}
-	free_rp_inst(rp);
-}
-
 /*
 * Add the new probe to ap->list. Fail if this is the
 * second jprobe at the address - two jprobes can't coexist
@@ -1885,6 +1865,26 @@ void __kprobes unregister_kretprobe(struct kretprobe *rp)
 }
 EXPORT_SYMBOL_GPL(unregister_kretprobe);
 
+static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
+{
+	unsigned long flags, hash;
+	struct kretprobe_instance *ri;
+	struct hlist_node *next;
+	struct hlist_head *head;
+
+	/* No race here */
+	for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) {
+		kretprobe_table_lock(hash, &flags);
+		head = &kretprobe_inst_table[hash];
+		hlist_for_each_entry_safe(ri, next, head, hlist) {
+			if (ri->rp == rp)
+				ri->rp = NULL;
+		}
+		kretprobe_table_unlock(hash, &flags);
+	}
+	free_rp_inst(rp);
+}
+
 void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
 {
 	int i;
-- 
1.7.11.7
--
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