From: Carsten Otte <cotte@de.ibm.com>
To: Jared Hulbert <jaredeh@gmail.com>
Cc: npiggin@suse.de, Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
mschwid2@linux.vnet.ibm.com, heicars2@linux.vnet.ibm.com,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 4/6] xip: support non-struct page backed memory
Date: Mon, 03 Mar 2008 09:18:21 +0100 [thread overview]
Message-ID: <47CBB44D.7040203@de.ibm.com> (raw)
In-Reply-To: <6934efce0803010014p2cc9a5edu5fee2029c0104a07@mail.gmail.com>
Jared Hulbert wrote:
> The problem is that virt_to_phys() gives bogus answer for a
> mtd->point()'ed address. It's a ioremap()'ed address which doesn't
> work with the ARM virt_to_phys(). I can get a physical address from
> mtd->point() with a patch I dropped a little while back.
Is there a chance virt_to_phys() can be fixed on arm? It looks like a
simple page table walk to me. If not, I would prefer to have
get_xip_address return a physical address over having to split the
code path here. S390 has a 1:1 mapping for xip mappings, thus it
would'nt be a big change for us.
WARNING: multiple messages have this Message-ID (diff)
From: Carsten Otte <cotte@de.ibm.com>
To: Jared Hulbert <jaredeh@gmail.com>
Cc: npiggin@suse.de, Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
mschwid2@linux.vnet.ibm.com, heicars2@linux.vnet.ibm.com,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 4/6] xip: support non-struct page backed memory
Date: Mon, 03 Mar 2008 09:18:21 +0100 [thread overview]
Message-ID: <47CBB44D.7040203@de.ibm.com> (raw)
In-Reply-To: <6934efce0803010014p2cc9a5edu5fee2029c0104a07@mail.gmail.com>
Jared Hulbert wrote:
> The problem is that virt_to_phys() gives bogus answer for a
> mtd->point()'ed address. It's a ioremap()'ed address which doesn't
> work with the ARM virt_to_phys(). I can get a physical address from
> mtd->point() with a patch I dropped a little while back.
Is there a chance virt_to_phys() can be fixed on arm? It looks like a
simple page table walk to me. If not, I would prefer to have
get_xip_address return a physical address over having to split the
code path here. S390 has a 1:1 mapping for xip mappings, thus it
would'nt be a big change for us.
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next prev parent reply other threads:[~2008-03-03 8:18 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080118045649.334391000@suse.de>
2008-01-18 4:56 ` [patch 1/6] mm: introduce VM_MIXEDMAP npiggin, Jared Hulbert
2008-01-18 4:56 ` [patch 2/6] mm: introduce pte_special pte bit npiggin-l3A5Bk7waGM
2008-01-18 4:56 ` npiggin
2008-01-18 4:56 ` npiggin
2008-01-18 16:41 ` Linus Torvalds
2008-01-18 16:41 ` Linus Torvalds
2008-01-18 18:04 ` Sam Ravnborg
2008-01-18 18:04 ` Sam Ravnborg
2008-01-18 18:28 ` Linus Torvalds
2008-01-18 18:28 ` Linus Torvalds
2008-01-18 18:53 ` Sam Ravnborg
2008-01-18 18:53 ` Sam Ravnborg
2008-01-18 22:46 ` Nick Piggin
2008-01-18 22:46 ` Nick Piggin
2008-01-18 23:03 ` Linus Torvalds
2008-01-18 23:03 ` Linus Torvalds
2008-01-19 5:07 ` Nick Piggin
2008-01-19 5:07 ` Nick Piggin
2008-01-21 9:43 ` Nick Piggin
2008-01-21 9:43 ` Nick Piggin
2008-01-18 4:56 ` [patch 3/6] mm: add vm_insert_mixed npiggin
2008-01-18 4:56 ` [patch 4/6] xip: support non-struct page backed memory npiggin
2008-01-18 4:56 ` npiggin
2008-03-01 8:14 ` Jared Hulbert
2008-03-01 8:14 ` Jared Hulbert
2008-03-03 5:29 ` Nick Piggin
2008-03-03 5:29 ` Nick Piggin
2008-03-03 8:30 ` Carsten Otte
2008-03-03 8:30 ` Carsten Otte
2008-03-03 15:59 ` Jared Hulbert
2008-03-03 15:59 ` Jared Hulbert
2008-03-03 8:18 ` Carsten Otte [this message]
2008-03-03 8:18 ` Carsten Otte
2008-03-03 15:44 ` Jared Hulbert
2008-03-03 15:44 ` Jared Hulbert
2008-03-03 18:40 ` Linus Torvalds
2008-03-03 18:40 ` Linus Torvalds
2008-03-03 19:38 ` Jared Hulbert
2008-03-03 19:38 ` Jared Hulbert
2008-03-03 20:04 ` Linus Torvalds
2008-03-03 20:04 ` Linus Torvalds
2008-03-03 20:32 ` Nick Piggin
2008-03-03 20:32 ` Nick Piggin
2008-03-03 22:21 ` Linus Torvalds
2008-03-03 22:21 ` Linus Torvalds
2008-03-03 23:25 ` Jared Hulbert
2008-03-03 23:25 ` Jared Hulbert
2008-03-04 9:06 ` Carsten Otte
2008-03-04 9:06 ` Carsten Otte
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