sched/idle: Add missing checks to the exit condition of cpu_idle_poll()
cpu_idle_poll() is entered into when either the cpu_idle_force_poll is set or tick_check_broadcast_expired() returns true. The exit condition from cpu_idle_poll() is tif_need_resched(). However this does not take into account scenarios where cpu_idle_force_poll changes or tick_check_broadcast_expired() returns false, without setting the resched flag. So a cpu will be caught in cpu_idle_poll() needlessly, thereby wasting power. Add an explicit check on cpu_idle_force_poll and tick_check_broadcast_expired() to the exit condition of cpu_idle_poll() to avoid this. Change-Id: I9e48347dba41ee9980afa00e0fe5be0fdddb5e6e Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20150121105655.15279.59626.stgit@preeti.in.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org> [pkondeti@codeaurora.org: Resolved merge conflicts] Git-commit: ff6f2d29bd31cdfa1ac494a8b26d2af8ba887d59 Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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@ -67,7 +67,8 @@ static inline int cpu_idle_poll(void)
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trace_cpu_idle_rcuidle(0, smp_processor_id());
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local_irq_enable();
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while (!tif_need_resched() && (cpu_idle_force_poll ||
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__get_cpu_var(idle_force_poll)))
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__get_cpu_var(idle_force_poll) ||
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tick_check_broadcast_expired()))
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cpu_relax();
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trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
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rcu_idle_exit();
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