On Mon, May 05, 2014 at 09:48:27PM +0100, Larry Bassel wrote: > Support for arch_irq_work_raise() was missing from > arm64 (a prerequisite for FULL_NOHZ). > > This patch is based on the arm32 patch ARM 7872/1 > which ports cleanly. > > commit bf18525fd793101df42a1344ecc48b49b62e48c9 > Author: Stephen Boyd <[email protected]> > Date: Tue Oct 29 20:32:56 2013 +0100 > > ARM: 7872/1: Support arch_irq_work_raise() via self IPIs > > By default, IRQ work is run from the tick interrupt (see > irq_work_run() in update_process_times()). When we're in full > NOHZ mode, restarting the tick requires the use of IRQ work and > if the only place we run IRQ work is in the tick interrupt we > have an unbreakable cycle. Implement arch_irq_work_raise() via > self IPIs to break this cycle and get the tick started again. > Note that we implement this via IPIs which are only available on > SMP builds. This shouldn't be a problem because full NOHZ is only > supported on SMP builds anyway. > > Signed-off-by: Stephen Boyd <[email protected]> > Reviewed-by: Kevin Hilman <[email protected]> > Cc: Frederic Weisbecker <[email protected]> > Signed-off-by: Russell King <[email protected]> > > Signed-off-by: Larry Bassel <[email protected]> > Reviewed-by: Kevin Hilman <[email protected]>
Looks fine to me, thanks. Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
