Re: [patch] x86_64: fix is_at_popf() for compat tasks

[Andi Kleen]

On Monday 31 July 2006 09:22, Chuck Ebbert wrote:
> When testing for the REX instruction prefix, first check
> for a 32-bit task because in compat mode the REX prefix is an
> increment instruction.

is_compat_task doesn't actually say that a task is in compat mode
(it refers to the Linux compat layer, not x86-64 compat mode)

A better test would be regs->cs == __USER32_CS, but in theory
there could be other code segments in LDT. I guess that can 
be ignored though.

-Andi
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