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Subject[PATCH 0/2] fix sysenter for 32-on-64 processes
Hi Ingo,

Here's a little two-part patch series which fixes 32-on-64 syscalls
using sysenter.

The first is a difference in ordering in arch_setup(); the 64-bit code
was calling early_init_cpu() way too late. Moving it earlier, to the
same place as the 32-bit code, works for me, but I wonder if it might
cause problems with other configurations. Certainly it makes logical
sense that both architectures do the same cpu setup at the same place.

The other fix is an outright Xen-specific bug, which resulted in
usermode registers being trashed as a result of an over-enthusiastic use
of sysret.

Both patches are .27 material, but I expect the arch_setup() change
needs to cooking before being comfortable with it.


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