On 11/30/2009 01:02 PM, Tejun Heo wrote:
498657a478c60be092208422fefa9c7b248729c2 incorrectly assumed that preempt wasn't disabled around context_switch() and thus was fixing imaginary problem. It also broke kvm because it depended on ->sched_in() to be called with irq enabled so that it can do smp calls from there. Revert the incorrect commit and add comment describing different contexts under with the two callbacks are invoked. * notifier: struct preempt_notifier for the task being preempted * next: the task that's kicking us out + * + * Please note that sched_in and out are called under different + * contexts. sched_in is called with rq lock held and irq disabled + * while sched_out is called without rq lock and irq enabled. */
Is this transposed? sched_in must be called with interrupts enabled for the kvm IPI to work.
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