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Message-Id: <1250029920.17599.103.camel@wall-e>
Date: Wed, 12 Aug 2009 00:32:00 +0200
From: Stefani Seibold <stefani@...bold.net>
To: linux-kernel <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>, Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 5/7] new kfifo API
kfifo.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
Signed-off-by: Stefani Seibold <stefani@...bold.net>
diff -u -N -r linux-2.6.31-rc4-kfifo4/include/linux/kfifo.h linux-2.6.31-rc4-kfifo5/include/linux/kfifo.h
--- linux-2.6.31-rc4-kfifo4/include/linux/kfifo.h 2009-08-11 22:14:19.000000000 +0200
+++ linux-2.6.31-rc4-kfifo5/include/linux/kfifo.h 2009-08-11 22:53:29.000000000 +0200
@@ -32,6 +32,28 @@
unsigned int out; /* data is extracted from off. (out % size) */
};
+#define KFIFO_INIT(s, b) \
+ (struct kfifo) { \
+ .size = s, \
+ .in = 0, \
+ .out = 0, \
+ .buffer = b \
+ }
+
+
+#define DECLARE_KFIFO(name, size) \
+union { \
+ struct kfifo name; \
+ unsigned char name##_buffer[size + sizeof(struct kfifo)]; \
+}
+
+#define DEFINE_KFIFO(name, size) \
+ DECLARE_KFIFO(name, size) = KFIFO_INIT(name, size)
+
+#define INIT_KFIFO(name) \
+ name = KFIFO_INIT(sizeof(name##_buffer) - sizeof(struct kfifo), \
+ name##_buffer)
+
extern void kfifo_init(struct kfifo *fifo,
unsigned char *buffer, unsigned int size);
extern __must_check int kfifo_alloc(struct kfifo *fifo,
@@ -52,6 +74,24 @@
}
/**
+ * kfifo_reset_in - skip input FIFO contents
+ * @fifo: the fifo to be emptied.
+ */
+static inline void kfifo_reset_in(struct kfifo *fifo)
+{
+ fifo->in = fifo->out;
+}
+
+/**
+ * kfifo_reset_in - skip output FIFO contents
+ * @fifo: the fifo to be emptied.
+ */
+static inline void kfifo_reset_out(struct kfifo *fifo)
+{
+ fifo->out = fifo->in;
+}
+
+/**
* kfifo_in_locked - puts some data into the FIFO using a spinlock for locking
* @fifo: the fifo to be used.
* @buffer: the data to be added.
@@ -122,4 +162,40 @@
return fifo->in - out;
}
+/**
+ * kfifo_size - returns the size of the fifo in bytes
+ * @fifo: the fifo to be used.
+ */
+static inline __must_check unsigned int kfifo_size(struct kfifo *fifo)
+{
+ return fifo->size;
+}
+
+/**
+ * kfifo_is_empty - returns true if the fifo is empty
+ * @fifo: the fifo to be used.
+ */
+static inline __must_check int kfifo_is_empty(struct kfifo *fifo)
+{
+ return fifo->in == fifo->out;
+}
+
+/**
+ * kfifo_is_full - returns true if the fifo is full
+ * @fifo: the fifo to be used.
+ */
+static inline __must_check int kfifo_is_full(struct kfifo *fifo)
+{
+ return kfifo_len(fifo) == kfifo_size(fifo);
+}
+
+/**
+ * kfifo_avail - returns the number of bytes available in the FIFO
+ * @fifo: the fifo to be used.
+ */
+static inline __must_check unsigned int kfifo_avail(struct kfifo *fifo)
+{
+ return kfifo_size(fifo) - kfifo_len(fifo);
+}
+
#endif
--
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