On Tue, Nov 24, 2009 at 12:37:03PM +0200, Tero Kristo wrote:

In some ARM architectures, like OMAP3, the VFP context can be lost during
dynamic sleep cycle. For this purpose, there is now a function
vfp_pm_save_context() that should be called before the VFP is assumed to
lose context. Next VFP trap will then restore context automatically.

We need to have the last_VFP_context[cpu] cleared after the save in idle,
else the restore would fail to restore when it sees that the last_VFP_context
is same as the current threads vfp_state. This happens when the same
process/thread traps an exception post idle.

Main work for this patch was done by Peter and Rajendra. Some cleanup and
optimization by Tero.

Why not re-use vfp_pm_suspend() ?  Haven't you shown that vfp_pm_suspend
may be buggy since it doesn't save in the VFP-disabled case?