Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch erratapatch

[Andrew Morton]

Jamie Lokier <jamie@xxxxxxxxxxxxx> wrote:
>
> What I'd really like your opinion on is the appropriate userspace
> behaviour.  If we don't care about fixing up userspace, then
> __ex_table is a much tidier workaround for the prefetch bug.

I think we should fix up userspace.

>  If we do
> care about fixing up userspace, then do we need a policy decision that
> says it's not acceptable to run on AMD without userspace fixups from
> 2.6.0 onwards - it must fixup userspace or refuse to run?

If you're saying that the kernel should refuse to boot if it discovers that
a) the CPU needs the workaround and b) the kernel does not implement the
workaround then yup.

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