On 08/10/2013 11:51 AM, Linus Torvalds wrote:
> That "kernel_stack" thing is actually getting the thread_info pointer,
> and it doesn't get cached because gcc thinks the preempt_count value
> might alias.

This is just plain braindamaged.  Somewhere on my list of things is to
merge thread_info and task_struct and have a pointer to the unified
structure.

	-hpa