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SubjectRe: [PATCH -tip] x86: fix iommu=soft boot option

* FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:

> On Wed, 25 Nov 2009 00:54:34 -0800
> Yinghai Lu <yinghai@kernel.org> wrote:
>
> > only remember that SLES 9 SP3 (?) at some point has problem with AMD
> > 10h ( quad core version) when memory > 4 g (with USB controller ?)
> > because the gart code only check K8 device id, and didn't check 10h
> > device id. so gart iommu is not used. and happenly swiotlb code has
> > problem with that kernel version.
> >
> > thinking we should keep old behavior, until some day we can remove
> > them all.
>
> Why? We are talking about changing 2.6.33 behavior. swiotlb in 2.6.33
> should be the safe option.

If that behavior was relied on for suspected (or real) bugs in the
swiotlb code then i agree that we should do this change. (and fix any
bugs if they still occur.)

Ingo


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