So, everything is ok. :-)
Gérard.
On 12 Feb 2002, Daniel Stodden wrote:
> hi.
>
> On Tue, 2002-02-12 at 03:44, David S. Miller wrote:
> > From: Gérard Roudier <groudier@free.fr>
> > Date: Sun, 10 Feb 2002 21:20:05 +0100 (CET)
> >
> > On Mon, 11 Feb 2002, Alan Cox wrote:
> >
> > > This function may not be called in interrupt context.
> >
> > Such limitation looks poor implementation to me.
> >
> > I agree with you Gerard, and probably nobody truly even requires
> > this limitation. I do plan to remove it after I've done a thorough
> > investigation of the platform implementations.
>
> ok, i've looked through most of 2.5.4 now.
> results look like this:
>
> pci_alloc_consistent() pci_free_consistent()
> i386:
> [1] ok ok
>
> ppc:
> [1] ok ok
>
> mips:
> [1] ok ok
>
> sh:
> [1] ok ok
> stm: [1] ok ok
> dc: [3] ok ok
>
> mips64:
> ip32: [1] ok ok
> ip27: [1] ok ok
>
> sparc:
> [1] GFP_KERNEL ok
> sparc64:
> [2] ok ok
>
> arm: [4] BUG()/GFP_KERNEL BUG()
>
> alpha:
> [2] ok ok
>
> ia64: [5] ok? ok?
>
>
> [1]
> gfp() + __pa() (or similar)
>
> [2]
> gfp() + IOMMU
>
> [3]
> dummy, offsets only
>
> [4]
> ARM does GFP_KERNEL, and then __ioremaps the underlying pages.
> ugh. is that the only way to get the area coherent?
> furthermore i don't see why this could not be interrupt safe.
>
> [5]
> i don't understand ia64. but it looks somewhat atomic :)
>
> well, assuming i didn't oversee anything, there are indeed few reasons
> left why the whole _consistent() machinery shouldn't be callable from
> interrupts.
>
> back to my original question: what were the last trees with shrinking
> pools? would the original version still work or any redesigns needed?
>
>
> regards,
> dns
>
> --
> ___________________________________________________________________________
> mailto:stodden@in.tum.de
>
>
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