[PATCH 1/7] Implement arch disable/enable irq hooks.

[Paul Mackerras]

I wrote:

> +7:	rlwinm	r12,r12,0,~TLF_SLEEPING

That should be rlwinm r12,r12,0,~_TLF_SLEEPING (with the leading
underscore), of course.  Thanks to Stephen Rothwell for pointing that
out.

Paul.