Messages in this thread | | | Date | Wed, 28 Oct 2009 05:36:11 +0100 | From | Andi Kleen <> | Subject | Re: is avoiding compat ioctls possible? |
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On Tue, Oct 27, 2009 at 08:37:09PM -0700, David Miller wrote: > On sparc64, in order to make debugging easier, we trap any time > the kernel does a userspace access to a compat task and any > of the upper 32-bits are non-zero.
Interesting. That definitely means Dave needs a special path.
> > However some architectures need special operations on compat pointers > > (s390 iirc), but if you don't support those it might be reasonable > > to not support that. > > s390 has to sign extend all 32-bit compat process pointers when > processing them in the 64-bit s390 kernel. I think one other > architecture has this kind of situation too.
Which other architure? I reviewed all the definitions in tree and don't see any other than s390 doing magic there.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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