linux-kernel - Re: SCSI RAM driver ported to 3.3 kernel for file system and I/O testing

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Message-ID: <4FB3E6B8.7050909@acm.org>
Date:	Wed, 16 May 2012 17:41:12 +0000
From:	Bart Van Assche <bvanassche@....org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
CC:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: SCSI RAM driver ported to 3.3 kernel for file system and I/O
 testing

On 05/16/12 17:07, Tim Chen wrote:

> +/*
> + * SCSI requires quantities to be written MSB.  They're frequently misaligned,
> + * so don't mess about with cpu_to_beN, just access it byte-wise
> + */
> +static void scsi_ram_put_u32(unsigned char *addr, unsigned int data)
> +{
> +	addr[0] = data >> 24;
> +	addr[1] = data >> 16;
> +	addr[2] = data >> 8;
> +	addr[3] = data;
> +}
> +
> +static unsigned int scsi_ram_get_u16(unsigned char *addr)
> +{
> +	unsigned int data;
> +	data = addr[0] << 8;
> +	data |= addr[1];
> +
> +	return data;
> +}
> +
> +static unsigned int scsi_ram_get_u24(unsigned char *addr)
> +{
> +	unsigned int data;
> +	data = addr[0] << 16;
> +	data |= addr[1] << 8;
> +	data |= addr[2];
> +
> +	return data;
> +}
> +
> +static unsigned int scsi_ram_get_u32(unsigned char *addr)
> +{
> +	unsigned int data;
> +	data = addr[0] << 24;
> +	data |= addr[1] << 16;
> +	data |= addr[2] << 8;
> +	data |= addr[3];
> +
> +	return data;
> +}


Please drop these functions and use get/put_unaligned_be*() instead.
Maybe it's a good idea to add get/put_unaligned_be24() helper functions
in the appropriate <linux/unaligned/...> header file - there is more
SCSI code that stores and retrieves 24-bit numbers.

Thanks,

Bart.
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