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Add the internal helper get_thread_info that calculates the thread_info from a given task variable. Also export this service as a convenience function. Note: ia64 version is untested. Signed-off-by: Jan Kiszka <[email protected]> Cc: Tony Luck <[email protected]> Cc: Fenghua Yu <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Jason Wessel <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Ben Widawsky <[email protected]> Cc: Borislav Petkov <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>