From: David Howells <dhowells@redhat.com>
To: Nick Piggin <npiggin@suse.de>
Cc: dhowells@redhat.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hugh@veritas.com>,
Jared Hulbert <jaredeh@gmail.com>,
Carsten Otte <cotte@de.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-arch@vger.kernel.org
Subject: Re: [rfc][patch 2/2] mm: introduce optional pte_special pte bit
Date: Wed, 16 Jan 2008 17:14:35 +0000 [thread overview]
Message-ID: <16391.1200503675@redhat.com> (raw)
In-Reply-To: <20080113031013.GD22285@wotan.suse.de>
Nick Piggin <npiggin@suse.de> wrote:
> Unfortunately, not all architectures can spare a bit in the pte for this. So
> add an ifdefs, depending on whether the arch can support it or not. Although
> pte_special can remove all restrictions that pfn mappings currently have, we
> continue to enforce those restrictions even on architectures that have the new
> pte bit, for consistency.
FRV has a single bit to spare in its PTEs (xAMPRx_RESERVED13) that you could
use.
MN10300 (which is currently lurking in the -mm tree) has no spare bits unless
I can drop either the PAGE_ACCESSED or PAGE_NX bits.
David
prev parent reply other threads:[~2008-01-16 17:15 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-13 3:08 [rfc] changes to user memory mapping scheme Nick Piggin
2008-01-13 3:09 ` [rfc][patch 1/2] mm: introduce VM_MIXEDMAP Nick Piggin
2008-01-13 3:10 ` [rfc][patch 2/2] mm: introduce optional pte_special pte bit Nick Piggin
2008-01-13 3:41 ` Linus Torvalds
2008-01-13 4:39 ` Nick Piggin
2008-01-13 4:45 ` Linus Torvalds
2008-01-13 5:06 ` Nick Piggin
2008-01-13 16:50 ` Linus Torvalds
2008-01-13 20:46 ` Martin Schwidefsky
2008-01-14 21:04 ` Jared Hulbert
2008-01-15 9:18 ` Carsten Otte
2008-01-16 3:38 ` Nick Piggin
2008-01-16 4:04 ` Linus Torvalds
2008-01-16 4:37 ` Nick Piggin
2008-01-16 4:48 ` Linus Torvalds
2008-01-16 4:51 ` David Miller
2008-01-16 5:23 ` Linus Torvalds
2008-01-16 5:48 ` Nick Piggin
2008-01-16 9:52 ` Martin Schwidefsky
2008-01-16 5:17 ` Nick Piggin
2008-01-16 10:52 ` Catalin Marinas
2008-01-16 18:18 ` Russell King
2008-01-16 17:21 ` Linus Torvalds
2008-01-16 17:14 ` David Howells [this message]
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