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Subject2.4.13-ac8 current() changes
2.4.13-ac8 changed get_current() to use cr2 instead of esp and
introduced hard_get_current() which uses esp. The comment on
hard_get_current() in include/asm-i386/smp.h says "for within NMI,
do_page_fault, cpu_init". But NMI, do_page_fault and cpu_init can
execute other code, any references to current() in that other code will
use get_current() instead of hard_get_current().

How is generic code called from NMI etc. meant to know which version of
current() to use? Usage of current() is hidden inside a lot of other
macros, this change looks like a data mismatch just waiting to bite us.

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