From: "Daniel Glöckner" <daniel-gl@gmx.net>
To: Bob Liu <lliubbo@gmail.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org, gerg@snapgear.com,
dhowells@redhat.com, lethal@linux-sh.org, gerg@uclinux.org,
walken@google.com, uclinux-dist-devel@blackfin.uclinux.org,
geert@linux-m68k.org
Subject: [PATCH] nommu: reimplement remap_pfn_range() to simply return 0
Date: Mon, 20 Jun 2011 08:59:08 +0200 [thread overview]
Message-ID: <20110620065907.GA29075@minime.bse> (raw)
In-Reply-To: <1308547333-27413-1-git-send-email-lliubbo@gmail.com>
On Mon, Jun 20, 2011 at 01:22:13PM +0800, Bob Liu wrote:
> Function remap_pfn_range() means map physical address pfn<<PAGE_SHIFT to
> user addr.
>
> For nommu arch it's implemented by vma->vm_start = pfn << PAGE_SHIFT which is
> wrong acroding the original meaning of this function.
>
> Some driver developer using remap_pfn_range() with correct parameter will get
> unexpected result because vm_start is changed.
>
> It should be implementd just like addr = pfn << PAGE_SHIFT which is meanless
> on nommu arch, so this patch just make it simply return 0.
I'd return -EINVAL if addr != pfn << PAGE_SHIFT.
And I can imagine architectures wanting to do something with the prot flags.
Daniel
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next prev parent reply other threads:[~2011-06-20 6:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 5:22 [PATCH] nommu: reimplement remap_pfn_range() to simply return 0 Bob Liu
2011-06-20 6:59 ` Daniel Glöckner [this message]
2011-06-20 7:51 ` Bob Liu
2011-06-20 12:04 ` [uclinux-dist-devel] " Mike Frysinger
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