Is it correct to store MSR in context switch?

[leonp]

Hello, all.
	I encountered the following problem (MPC860, RTEMS 20001201 but this seems 
to be not touched):
	The Machine Status Register is saved each time the context switch is 
performed. This leads to the following unexpected result - if in one task the 
_ISR_Disable(arg) is used, it may be neutralized by the task switch. One can 
say, that this is very unusual thing to disable interrupts in the running 
system still doing task switching. But this is not an impossible case - I 
need it :-)).
	Will it cause any harm if the MSR register will not be saved in context 
switches? It does not seem to contain any task specific information...

leonp at plris.com