tree dfbcc71256c2129d2e0ee3e077461103338b9591
parent bb57c3edcd2fc51d95914c39448f36e43af9d6af
author Tony Battersby <tonyb@cybernetics.com> 1238538253 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1238601559 -0700

epoll: don't use current in irq context

ep_call_nested() (formerly ep_poll_safewake()) uses "current" (without
dereferencing it) to detect callback recursion, but it may be called from
irq context where the use of current is generally discouraged.  It would
be better to use get_cpu() and put_cpu() to detect the callback recursion.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Acked-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>