linux-kernel - Re: [BUG] __copy_to_user_inatomic broken on non Pentium machines

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Message-Id: <1174851671.3892.2.camel@chaos>
Date:	Sun, 25 Mar 2007 21:41:11 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Stable Kernel Team <stable@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>
Subject: Re: [BUG] __copy_to_user_inatomic broken on non Pentium machines

On Sun, 2007-03-25 at 11:14 -0700, Linus Torvalds wrote:
> > Environment: Pre Pentium systems, (boot_cpu_data.wp_works_ok == 0)
> 
> This shouldn't be "pre-pentium", afaik. WP-works-ok on i486 too. I think 
> only the original i386 had this bug ("feature").
>
> But I agree, it does seem to be broken on such machines (I assume you 
> don't actually have one, but just tested by forcing it by hand ;)

Yes, it's a genuine i386 embedded system and AFAIK the same feature is
available on 486 clones. i386 and Co are still in used in the embedded
space.

	tglx




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