From: "Stephen C. Tweedie" <sct@redhat.com>
To: James Simmons <jsimmons@edgeglobal.com>
Cc: Linux MM <linux-mm@kvack.org>
Subject: Re: MMIO regions
Date: Mon, 4 Oct 1999 16:31:52 +0100 (BST) [thread overview]
Message-ID: <14328.51304.207897.182095@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.10.9910041028350.7066-100000@imperial.edgeglobal.com>
Hi,
On Mon, 4 Oct 1999 10:38:13 -0400 (EDT), James Simmons
<jsimmons@edgeglobal.com> said:
> I noticed something for SMP machines with all the dicussion about
> concurrent access to memory regions. What happens when you have two
> processes that have both mmapped the same MMIO region for some card.
The kernel doesn't impose any limits against this. If you want to make
this impossible, then you need to add locking to the driver itself to
prevent multiple processes from conflicting.
--Stephen
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next prev parent reply other threads:[~1999-10-04 15:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-04 14:38 James Simmons
1999-10-04 15:31 ` Stephen C. Tweedie [this message]
1999-10-04 15:52 ` James Simmons
1999-10-04 16:02 ` Benjamin C.R. LaHaise
1999-10-04 17:27 ` James Simmons
1999-10-04 17:56 ` Benjamin C.R. LaHaise
1999-10-04 18:26 ` James Simmons
1999-10-04 19:19 ` Stephen C. Tweedie
1999-10-06 20:15 ` James Simmons
1999-10-11 17:09 ` Stephen C. Tweedie
1999-10-11 17:26 ` Jeff Garzik
1999-10-11 23:14 ` James Simmons
1999-10-11 17:57 ` James Simmons
1999-10-04 16:11 ` Stephen C. Tweedie
1999-10-04 18:29 ` James Simmons
1999-10-04 19:35 ` Stephen C. Tweedie
1999-10-07 19:40 ` James Simmons
1999-10-10 11:24 ` Rik Faith
1999-10-10 14:03 ` Eric W. Biederman
1999-10-10 18:46 ` Rik Faith
1999-10-11 0:21 ` James Simmons
1999-10-11 10:59 ` Rik Faith
1999-10-11 3:38 ` Eric W. Biederman
1999-10-10 14:21 ` James Simmons
1999-10-11 17:22 ` Stephen C. Tweedie
1999-10-04 16:58 ` Marcus Sundberg
1999-10-04 18:27 ` James Simmons
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