[PATCH 1/4 v4] POWERPC: Add _nmask_and_or_msr() declartion to asm-powerpc/system.h

[Paul Mackerras]

Jon Loeliger writes:

> +extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);

Hmmm, I wish someone would think of a better name for it.  In fact I
have tended to avoid using it, and instead done things like

	mtmsr((mfmsr() & ~x) | y);

where necessary instead.

Paul.