From: Nick Piggin <npiggin@suse.de>
To: Thomas Hellstrom <thomas@tungstengraphics.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch 4/5] mm: add vm_insert_pfn helpler
Date: Wed, 11 Oct 2006 13:24:36 +0200 [thread overview]
Message-ID: <20061011112436.GA6835@wotan.suse.de> (raw)
In-Reply-To: <452CC383.4050401@tungstengraphics.com>
On Wed, Oct 11, 2006 at 12:12:19PM +0200, Thomas Hellstrom wrote:
> Nick, I just realized: would it be possible to have a pgprot_t argument
> to this one, instead of it using vma->vm_pgprot?
>
> The motivation for this (DRM again) is that some architectures (powerpc)
> cannot map the AGP aperture through IO space, but needs to remap the
> page from memory with a nocache attribute set. Others need special
> pgprot settings for write-combined mappings.
>
> Now, there's a possibility to change vma->vm_pgprot during the first
> ->fault(), but again, we only have the mmap_sem in read mode.
I don't see a problem with that. It would be nice if vm_pgprot could
be kept in synch with the pte protections, but I guess a crazy
driver should be allowed to do anything it wants ;)
next prev parent reply other threads:[~2006-10-11 11:24 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-10 14:21 [rfc] 2.6.19-rc1-git5: consolidation of file backed fault handlers Nick Piggin
2006-10-10 14:21 ` [patch 1/5] mm: fault vs invalidate/truncate check Nick Piggin
2006-10-10 14:21 ` [patch 2/5] mm: fault vs invalidate/truncate race fix Nick Piggin
2006-10-11 4:38 ` Andrew Morton
2006-10-11 5:39 ` Nick Piggin
2006-10-11 6:00 ` Andrew Morton
2006-10-11 9:21 ` Nick Piggin
2006-10-11 16:21 ` Linus Torvalds
2006-10-11 16:57 ` SPAM: " Nick Piggin
2006-10-11 17:11 ` Linus Torvalds
2006-10-11 17:21 ` SPAM: " Nick Piggin
2006-10-11 17:38 ` Linus Torvalds
2006-10-12 3:33 ` Nick Piggin
2006-10-12 15:37 ` Linus Torvalds
2006-10-12 15:40 ` Nick Piggin
2006-10-11 5:13 ` Andrew Morton
2006-10-11 5:50 ` Nick Piggin
2006-10-11 6:10 ` Andrew Morton
2006-10-11 6:17 ` [patch 1/6] revert "generic_file_buffered_write(): handle zero length iovec segments" Andrew Morton
[not found] ` <20061010231150.fb9e30f5.akpm@osdl.org>
2006-10-11 6:17 ` [patch 2/6] revert "generic_file_buffered_write(): deadlock on vectored write" Andrew Morton
[not found] ` <20061010231243.bc8b834c.akpm@osdl.org>
2006-10-11 6:17 ` [patch 3/6] generic_file_buffered_write() cleanup Andrew Morton
[not found] ` <20061010231339.a79c1fae.akpm@osdl.org>
2006-10-11 6:18 ` [patch 4/6] generic_file_buffered_write(): fix page prefaulting Andrew Morton
[not found] ` <20061010231424.db88931f.akpm@osdl.org>
2006-10-11 6:18 ` [patch 5/6] generic_file_buffered_write(): max_len cleanup Andrew Morton
[not found] ` <20061010231514.c1da7355.akpm@osdl.org>
2006-10-11 6:18 ` [patch 6/6] fix pagecache write deadlocks Andrew Morton
2006-10-21 1:53 ` [patch 2/5] mm: fault vs invalidate/truncate race fix Benjamin Herrenschmidt
2006-10-10 14:22 ` [patch 3/5] mm: fault handler to replace nopage and populate Nick Piggin
2006-10-10 14:22 ` [patch 4/5] mm: add vm_insert_pfn helpler Nick Piggin
2006-10-11 10:12 ` Thomas Hellstrom
2006-10-11 11:24 ` Nick Piggin [this message]
2006-10-11 21:30 ` Thomas Hellström
2006-10-10 14:22 ` [patch 5/5] mm: merge nopfn with fault handler Nick Piggin
2006-10-10 14:26 ` [rfc] 2.6.19-rc1-git5: consolidation of file backed fault handlers Nick Piggin
2006-10-10 14:33 ` Christoph Hellwig
2006-10-10 15:01 ` Nick Piggin
2006-10-10 16:09 ` Arjan van de Ven
2006-10-11 0:46 ` SPAM: " Nick Piggin
2006-10-10 15:07 ` Arjan van de Ven
-- strict thread matches above, loose matches on Subject: below --
2006-10-09 16:12 Nick Piggin
2006-10-09 16:12 ` [patch 4/5] mm: add vm_insert_pfn helpler Nick Piggin
2006-10-09 21:03 ` Benjamin Herrenschmidt
2006-10-10 0:42 ` Nick Piggin
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