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SubjectRe: thread_info implementation

> why have thread_info and task_struct to be two different pointers? I'd
> prefer two keep one pointer, through everything is accessed, that means
> thread_info would be part of task_struct.

Paul and I talked about this and we guessed it is an intel hack so they
can use the "mask the stack pointer to get to struct thread_info" trick.

On archs where we use a register to point to current I cant see why we
need this thread_info junk. I'd be happy if we could put it all in the
task struct for non intel.

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