From: Carsten Otte <cotte@de.ibm.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Jes Sorensen <jes@sgi.com>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Hugh Dickins <hugh@veritas.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
bjorn_helgaas@hp.com
Subject: Re: [patch] do_no_pfn handler
Date: Tue, 11 Apr 2006 17:26:16 +0200 [thread overview]
Message-ID: <443BCA98.1020805@de.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0604110751510.10745@g5.osdl.org>
Linus Torvalds wrote:
> At the very least, it would also need a
>
> BUG_ON(is_cow_mapping(vma->vm_flags));
>
> (or at least make it return VM_FAULT_SIGBUS). Because a COW mapping _will_
> confuse the VM and cause it to do random bad things in vm_normal_page().
That leaves my use-case out for now. I will need COW for my mapping when
switching to this interface. Looks like a lot of things need rethinking
in memory.c for COW with no struct page behind.
--
Carsten Otte
IBM Linux technology center
ARCH=s390
next prev parent reply other threads:[~2006-04-11 15:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-03 11:32 [patch] do_no_pfn handler Jes Sorensen
2006-04-03 11:46 ` Nick Piggin
2006-04-03 14:49 ` Jes Sorensen
2006-04-04 10:58 ` Jes Sorensen
2006-04-04 11:05 ` Nick Piggin
2006-04-05 9:34 ` Jes Sorensen
2006-04-19 14:10 ` [patch - repost] " Jes Sorensen
2006-04-21 10:41 ` Nick Piggin
2006-04-24 7:55 ` Jes Sorensen
2006-04-11 14:29 ` [patch] " Jes Sorensen
2006-04-11 15:10 ` Linus Torvalds
2006-04-11 15:26 ` Carsten Otte [this message]
2006-04-11 15:35 ` Linus Torvalds
2006-04-11 20:03 ` Carsten Otte
2006-04-11 20:30 ` Linus Torvalds
2006-04-11 20:53 ` Carsten Otte
2006-04-12 9:09 ` Jes Sorensen
2006-04-12 9:16 ` Carsten Otte
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