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6fefb0d175
This fixes various issues in the return path for "paranoid" handlers (= running on a private exception stack that act like NMIs). Generalize previous hack to switch back to process stack for scheduling/signal handling purposes. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>