From: Andi Kleen <andi@firstfloor.org>
References: <200912271003.631128760@firstfloor.org>
In-Reply-To: <200912271003.631128760@firstfloor.org>
To: stefani@seibold.net, linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: [PATCH] [5/6] kfifo: Add kfifo_initialized
Message-Id: <20091227210315.AE55EB17C3@basil.firstfloor.org>
Date: Sun, 27 Dec 2009 22:03:15 +0100 (CET)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1237
Lines: 39


Simple inline that checks if kfifo_init() has been executed
on a fifo.

This is useful for walking all per CPU fifos, when some of them
might not have been brought up yet.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
 include/linux/kfifo.h |   10 ++++++++++
 1 file changed, 10 insertions(+)

Index: linux/include/linux/kfifo.h
===================================================================
--- linux.orig/include/linux/kfifo.h
+++ linux/include/linux/kfifo.h
@@ -117,6 +117,16 @@ extern __must_check unsigned int kfifo_o
 extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
 				void *to, unsigned int len, unsigned offset);
 
+/**
+ * kfifo_initialized - Check if kfifo is initialized.
+ * @fifo: fifo to check
+ * Return %true if FIFO is initialized, otherwise %false.
+ * Assumes the fifo was 0 before.
+ */
+static inline bool kfifo_initialized(struct kfifo *fifo)
+{
+	return fifo->buffer != 0;
+}
 
 /**
  * kfifo_reset - removes the entire FIFO contents
--
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