From: "Jared Hulbert" <jaredeh@gmail.com>
To: carsteno@de.ibm.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, 3 Mar 2008 07:44:50 -0800 [thread overview]
Message-ID: <6934efce0803030744w6946e74an113d359c398415cd@mail.gmail.com> (raw)
In-Reply-To: <47CBB44D.7040203@de.ibm.com>
> Is there a chance virt_to_phys() can be fixed on arm? It looks like a
> simple page table walk to me.
Are there functions already available for doing a page table walk? If
so it could be done. I'd like that. If somebody could point me in the
right direction I'd appreciate it.
It might be a problem because today the simple case for virt_to_phys()
just subtracts 0x20000000 to go from 0xCXXXXXXX to 0xAXXXXXXX. So it
could have a negative performance if we complicate it.
Is it possible that it might be easier to fix this if we changed
ioremap()? I got the impression that ioremap() on ARM ends up placing
ioremap()'ed memory in the middle of the 0xCXXXXXXX range that is
valid for RAM.
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next prev parent reply other threads:[~2008-03-03 15:44 UTC|newest]
Thread overview: 25+ 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
2008-01-18 16:41 ` Linus Torvalds
2008-01-18 18:04 ` Sam Ravnborg
2008-01-18 18:28 ` Linus Torvalds
2008-01-18 18:53 ` Sam Ravnborg
2008-01-18 22:46 ` Nick Piggin
2008-01-18 23:03 ` Linus Torvalds
2008-01-19 5:07 ` 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
2008-03-01 8:14 ` Jared Hulbert
2008-03-03 5:29 ` Nick Piggin
2008-03-03 8:30 ` Carsten Otte
2008-03-03 15:59 ` Jared Hulbert
2008-03-03 8:18 ` Carsten Otte
2008-03-03 15:44 ` Jared Hulbert [this message]
2008-03-03 18:40 ` Linus Torvalds
2008-03-03 19:38 ` Jared Hulbert
2008-03-03 20:04 ` Linus Torvalds
2008-03-03 20:32 ` Nick Piggin
2008-03-03 22:21 ` Linus Torvalds
2008-03-03 23:25 ` Jared Hulbert
2008-03-04 9:06 ` Carsten Otte
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