linux-kernel - Re: single bit flip detector.

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Message-Id: <1154470467.15540.88.camel@localhost.localdomain>
Date:	Tue, 01 Aug 2006 23:14:27 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: single bit flip detector.

Ar Maw, 2006-08-01 am 14:44 -0400, ysgrifennodd Dave Jones:
> +		case POISON_FREE ^ 0x01:
> +		case POISON_FREE ^ 0x02:
> +		case POISON_FREE ^ 0x04:
> +		case POISON_FREE ^ 0x08:
> +		case POISON_FREE ^ 0x10:
> +		case POISON_FREE ^ 0x20:
> +		case POISON_FREE ^ 0x40:
> +		case POISON_FREE ^ 0x80:
> +			printk (KERN_ERR "Single bit error detected. Possibly bad RAM.\n");
> +#ifdef CONFIG_X86
> +			printk (KERN_ERR "Run memtest86 or other memory test tool.\n");
> +#endif
> +			return;

Gack .. NAK

#1: Do we want memtest86 or memtest86+ ?
#2: The check is horrible and there is an elegant implementation for
single bit.

	errors = value ^ expected;
	if (errors && !(errors & (errors - 1)))
		printk(KERN_ERR "Single bit error detected....");

Alan
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