linux-kernel - Re: [PATCH] [6/6] kfifo: Document everywhere that size has to be power of two

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Date:	Sun, 27 Dec 2009 22:50:32 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [PATCH] [6/6] kfifo: Document everywhere that size has to be
 power of two

Am Sonntag, den 27.12.2009, 22:03 +0100 schrieb Andi Kleen:
> On my first try using them I missed that the fifos need to 
> be power of two, resulting in a runtime bug. Document that requirement
> everywhere (and fix one grammar bug)
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 

Acked: Stefani Seibold <Stefani@...bold.net>

> ---
>  include/linux/kfifo.h |    4 ++--
>  kernel/kfifo.c        |    2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> Index: linux/include/linux/kfifo.h
> ===================================================================
> --- linux.orig/include/linux/kfifo.h
> +++ linux/include/linux/kfifo.h
> @@ -67,7 +67,7 @@ struct kfifo {
>  /**
>   * DECLARE_KFIFO - macro to declare a kfifo and the associated buffer
>   * @name: name of the declared kfifo datatype
> - * @size: size of the fifo buffer
> + * @size: size of the fifo buffer. Must be a power of two.
>   *
>   * Note1: the macro can be used inside struct or union declaration
>   * Note2: the macro creates two objects:
> @@ -91,7 +91,7 @@ union { \
>  /**
>   * DEFINE_KFIFO - macro to define and initialize a kfifo
>   * @name: name of the declared kfifo datatype
> - * @size: size of the fifo buffer
> + * @size: size of the fifo buffer. Must be a power of two.
>   *
>   * Note1: the macro can be used for global and local kfifo data type variables
>   * Note2: the macro creates two objects:
> Index: linux/kernel/kfifo.c
> ===================================================================
> --- linux.orig/kernel/kfifo.c
> +++ linux/kernel/kfifo.c
> @@ -41,7 +41,7 @@ static void _kfifo_init(struct kfifo *fi
>   * kfifo_init - initialize a FIFO using a preallocated buffer
>   * @fifo: the fifo to assign the buffer
>   * @buffer: the preallocated buffer to be used.
> - * @size: the size of the internal buffer, this have to be a power of 2.
> + * @size: the size of the internal buffer, this has to be a power of 2.
>   *
>   */
>  void kfifo_init(struct kfifo *fifo, void *buffer, unsigned int size)


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