kfifo: add kfifo_initialized
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> Acked-by: Stefani Seibold <stefani@seibold.net> Cc: Roland Dreier <rdreier@cisco.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Andy Walls <awalls@radix.net> Cc: Vikram Dhillon <dhillonv10@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -116,6 +116,16 @@ extern __must_check unsigned int kfifo_out(struct kfifo *fifo,
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extern __must_check unsigned int kfifo_out_peek(struct kfifo *fifo,
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void *to, unsigned int len, unsigned offset);
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/**
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* kfifo_initialized - Check if kfifo is initialized.
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* @fifo: fifo to check
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* Return %true if FIFO is initialized, otherwise %false.
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* Assumes the fifo was 0 before.
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*/
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static inline bool kfifo_initialized(struct kfifo *fifo)
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{
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return fifo->buffer != 0;
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}
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/**
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* kfifo_reset - removes the entire FIFO contents
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