linux-kernel - [PATCH] audit: use atomic_t to simplify audit

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Message-Id: <2fe582f41341249b34a76b8507e6b2589fa5f676.1402946960.git.rgb@redhat.com>
Date:	Mon, 16 Jun 2014 15:56:15 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	linux-audit@...hat.com, linux-kernel@...r.kernel.org
Cc:	Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH] audit: use atomic_t to simplify audit_serial()

Since there is already a primitive to do this operation in the atomic_t, use it
to simplify audit_serial().

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 kernel/audit.c |   14 ++------------
 1 files changed, 2 insertions(+), 12 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 218899b..d41266c 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1257,19 +1257,9 @@ err:
  */
 unsigned int audit_serial(void)
 {
-	static DEFINE_SPINLOCK(serial_lock);
-	static unsigned int serial = 0;
+	static atomic_t serial = ATOMIC_INIT(0);
 
-	unsigned long flags;
-	unsigned int ret;
-
-	spin_lock_irqsave(&serial_lock, flags);
-	do {
-		ret = ++serial;
-	} while (unlikely(!ret));
-	spin_unlock_irqrestore(&serial_lock, flags);
-
-	return ret;
+	return atomic_add_return(1, &serial);
 }
 
 static inline void audit_get_stamp(struct audit_context *ctx,
-- 
1.7.1

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