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Message-ID: <3DE7B0C2.7050301@colorfullife.com>
Date: Fri, 29 Nov 2002 19:24:02 +0100
From: Manfred Spraul <manfred@colorfullife.com>
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To: Russell King <rmk@arm.linux.org.uk>
CC: Georg Nikodym <georgn@somanetworks.com>, linux-kernel@vger.kernel.org
Subject: Re: v2.4.19-rmk4 slab.c: /proc/slabinfo uses broken instead of slab
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Russell King wrote:

>On Thu, Nov 28, 2002 at 11:34:20PM +0100, Manfred Spraul wrote:
>  
>
>>On i386, it's possible to skip set_fs() and use __get_user() - but 
>>that's i386 specific. For example the i386 oops code uses that.
>>    
>>
>
>That isn't actually an x86 specific feature - it is a requirement across
>all architectures that get_user() and friends can access kernel areas
>after set_fs(get_ds())
>  
>
It's i386 specific that
    __get_user().
is equivalent to
    set_fs(KERNEL_DS)
    get_user()
arch/i386/kernel/traps.c uses that in the fault code.

Portable code must use set_fs()/get_user(), i386 specific code can 
continue to use __get_user().

--
    Manfred

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