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Peter Zijlstra
c7138f37f9
Impact: fix kerneltop 100% CPU usage Only return a poll event when there's actually been one, poll_wait() doesn't actually wait for the waitq you pass it, it only enqueues you on it. Only once all FDs have been iterated and none of thm returned a poll-event will it schedule(). Also make it return POLL_HUP when there's not mmap() area to read from. Further, fix a silly bug in the write code. Reported-by: Mike Galbraith <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Arjan van de Ven <[email protected]> Orig-LKML-Reference: <1237897096.24918.181.camel@twins> Signed-off-by: Ingo Molnar <[email protected]>