From: Matt Porter <mporter@kernel.crashing.org>
To: Dmytro Bablinyuk <dmytro.bablinyuk@tait.co.nz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Problem with remap_page_range
Date: Tue, 9 Sep 2003 15:06:35 -0700 [thread overview]
Message-ID: <20030909150635.C20267@home.com> (raw)
In-Reply-To: <3F5E4C0C.1080303@tait.co.nz>; from dmytro.bablinyuk@tait.co.nz on Wed, Sep 10, 2003 at 09:54:20AM +1200
On Wed, Sep 10, 2003 at 09:54:20AM +1200, Dmytro Bablinyuk wrote:
> >
> >
> >> if (remap_page_range(vma->vm_start,
> >> DSP_ADDR,
> >> size,
> >> vma->vm_page_prot
> >> ))
> >>
> >>
> >
> >Your remap call isn't adding _PAGE_NO_CACHE and _PAGE_GUARDED flags
> >like ioremap_nocache()/ioremap() do on PPC. You'll get bad results
> >because of the ordering and cache issues resulting from not using
> >these PTE flags. In 2.6, these can be added using pgprot_noncached()
> >that is defined per-arch.
> >
> >
> >
> Thank you Matt,
>
> Coud you please give me en example on how to add these flags to remap in
> kernel 2.4.21 (powerpc).
> It seems I could not find these flags available in my kernel.
They're defined in include/asm-ppc/pgtable.h
-Matt
prev parent reply other threads:[~2003-09-09 22:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-10 1:13 Problem with remap_page_range Dmytro Bablinyuk
2003-09-09 9:59 ` Jamie Lokier
2003-09-09 17:03 ` Matt Porter
2003-09-10 2:19 ` Dmytro Bablinyuk
2003-09-09 17:02 ` Matt Porter
2003-09-09 21:54 ` Dmytro Bablinyuk
2003-09-09 22:06 ` Matt Porter [this message]
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