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Kosuku reports that there were a fair number of buggy waitqueue_active() users and this function deserves a big comment in order to avoid growing more. Reported-by: Kosuke Tatsukawa <tatsu@ab.jp.nec.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>