[PATCH 0/3] fix and cleanup FPU ownership management

[Atsushi Nemoto <anemo@mba.ocn.ne.jp>]

This patchset fixes several potential problem related FPU ownership
management.  The main problem is
save_fp_contect()/restore_fp_context() might sleep on accessing user
stack and therefore might lose FPU ownership in middle of them.

The first patch ("do_fpe() cleanup") is just a cleanup to preparation.

The second patch ("Allow CpU exception in kernel partially") is main
part.  This is an alternative of the patch posted before:
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20060829.225631.41630441.anemo%40mba.ocn.ne.jp

The third patch ("Cleanup FPU ownership management") is an another
cleanup and get rid of most preempt_disable()/preempt_enable() pairs
around.


Please review.  Thank you.

---
Atsushi Nemoto