linux-kernel - Re: [RFC v2] Documentation about unaligned memory access

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Message-ID: <Pine.LNX.4.64.0711291859330.13075@fbirervta.pbzchgretzou.qr>
Date:	Thu, 29 Nov 2007 19:00:52 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Kyle McMartin <kyle@...artin.ca>
cc:	Daniel Drake <dsd@...too.org>, linux-kernel@...r.kernel.org,
	avuton@...il.com, hancockr@...w.ca, alan@...rguk.ukuu.org.uk,
	andi@...stfloor.org, mrmacman_g4@....com, dean@...tic.org,
	argggh@...phinics.no, shdl@...alwe.fi, vlobanov@...akeasy.net,
	drzeus-list@...eus.cx, strange@....no-ip.org, dm.n9107@...il.com,
	johannes@...solutions.net
Subject: Re: [RFC v2] Documentation about unaligned memory access


On Nov 29 2007 12:04, Kyle McMartin wrote:
>
>For example, if you had 4GB of virtual memory, picture it as an
>array of bytes,
>	u8 memory[4096 * (1024 * 1024)];	/* 4G bytes */

uint8_t memory[4096UL * 1024 * 1024];

>Aligned accesses would be accessing this array in this manner,
>	u16 memory[(4096 * (1024 * 1024)) / sizeof(u16)] /* 2G bytes */
>	u32 memory[(4096 * (1024 * 1024)) / sizeof(u32)] /* 1G bytes */
>	u64 memory[(4096 * (1024 * 1024)) / sizeof(u64)] /* 512M bytes */

	u64 memory[4096UL * 1024 * 1024 / sizeof(u64)] /* 4G too */
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