From: "Stephen C. Tweedie" <sct@redhat.com>
To: PRASENJIT CHAKRABORTY <pras_chakra@yahoo.com>
Cc: linux-mm@kvack.org, arund@bellatlantic.net
Subject: Re: can i call copy_to_user with interrupts masked
Date: Mon, 27 Aug 2001 16:05:32 +0100 [thread overview]
Message-ID: <20010827160532.H5970@redhat.com> (raw)
In-Reply-To: <20010827145640.79597.qmail@web14201.mail.yahoo.com>; from pras_chakra@yahoo.com on Mon, Aug 27, 2001 at 07:56:40AM -0700
Hi,
On Mon, Aug 27, 2001 at 07:56:40AM -0700, PRASENJIT CHAKRABORTY wrote:
> This is in continuation with my previous mail.
> While debugging I've noticed that __copy_to_user()
> fails when I stop the Bottom Half before the call to
> __copy_to_user(), so if the page in not currently
> mapped then it forbids do_page_fault() to get invoked
> and hence the failure.
You're doing copy_to_user from a bottom half?????? You cannot do
that. *Ever*. It's illegal to take page faults from an interrupt of
any sort.
Cheers,
STephen
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next prev parent reply other threads:[~2001-08-27 15:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-27 14:56 can i call copy_to_user with interrupts masked PRASENJIT CHAKRABORTY
2001-08-27 15:05 ` Stephen C. Tweedie [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-08-27 15:09 Viju
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