linux-kernel - Re: [PATCH 05/44 take 2] [UBI] internal common header

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Date:	Mon, 19 Feb 2007 10:54:45 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Artem Bityutskiy <dedekind@...radead.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Frank Haverkamp <haver@...t.ibm.com>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 05/44 take 2] [UBI] internal common header

On Sat, Feb 17, 2007 at 06:54:49PM +0200, Artem Bityutskiy wrote:
> +#ifndef __UBI_UBI_H__
> +#define __UBI_UBI_H__
> +
> +#include <linux/mtd/ubi.h>
> +
> +/* Version of this UBI implementation */
> +#define UBI_VERSION 1

We shouldn't have versions for inkernel interfaces.

> +/* UBI messages printk level */
> +#define UBI_MSG_LEVEL  KERN_INFO
> +#define UBI_WARN_LEVEL KERN_WARNING
> +#define UBI_ERR_LEVEL  KERN_ERR

Please use the KERN_ macros directly.

> +/* Normal UBI messages */
> +#define ubi_msg(fmt, ...)                                                   \
> +	printk(UBI_MSG_LEVEL UBI_MSG_PREF " " fmt "\n", ##__VA_ARGS__)
> +/* UBI warning messages */
> +#define ubi_warn(fmt, ...)                                                  \
> +	printk(UBI_WARN_LEVEL UBI_WARN_PREF " %s: " fmt "\n", __FUNCTION__, \
> +	       ##__VA_ARGS__)
> +/* UBI error messages */
> +#define ubi_err(fmt, ...)                                                   \
> +	printk(UBI_ERR_LEVEL UBI_ERR_PREF " %s " fmt "\n", __FUNCTION__,    \
> +	       ##__VA_ARGS__)

you should probably use dev_printk and the wrappers around it in most
places.

> +extern int ubis_num;
> +extern struct ubi_info *ubis[UBI_MAX_INSTANCES];

Having this kind of global information directly exposed is a very
bad idea.  In general you only want to access it through more
specific information and avoid allocating the global array at all.

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