From mboxrd@z Thu Jan  1 00:00:00 1970
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To: "Rafael E. Herrera" <raffo@neuronet.pitt.edu>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] EISA 100/10 add-on card causes kernel BUG 
In-Reply-To: Message from "Rafael E. Herrera" <raffo@neuronet.pitt.edu>
   of "Sat, 16 Mar 2002 00:50:13 EST." <3C92DD15.4060008@neuronet.pitt.edu>
References: <3C92DD15.4060008@neuronet.pitt.edu> 
Date: Sat, 16 Mar 2002 11:42:31 -0700
From: Grant Grundler <grundler@dsl2.external.hp.com>
Message-Id: <20020316184231.482C6482C@dsl2.external.hp.com>
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"Rafael E. Herrera" wrote:
...
> WARNING! Stack pointer and cr30 do not correspond!

A few times, this error (it's not a warning) meant the 
driver was attempting to access user space data directly.
This is wrong and unfortunately it *usually* (but not always)
works on x86 arch. The right way to access user space data
is via copy_from_user() or write asm code that explicitly
references Space Registers (eg sr3).

grant